Categories of Questions

## Amazon Array Questions

**Question 1. Trapping Rain Water Leetcode Solution** Problem Statement The Trapping Rain Water LeetCode Solution – “Trapping Rain Water” states that given an array of heights which represents an elevation map where the width of each bar is 1. We need to find the amount of water trapped after rain. Example: Input: height = [0,1,0,2,1,0,1,3,2,1,2,1] Output: 6 Explanation: Check ...

**Question 2. Sort Array by Increasing Frequency Leetcode Solution** Problem Statement The Sort Array by Increasing Frequency LeetCode Solution – “Sort Array by Increasing Frequency” states that you’re given an array of integers, sort the array in increasing order based on the frequency of the values. Two or more values have the same frequency, we need to sort them ...

**Question 3. Partition to K Equal Sum Subsets Leetcode Solution** Problem Statement The Partition to K Equal Sum Subsets LeetCode Solution – “Partition to K Equal Sum Subsets” states that you’re given the integer array nums and an integer k, return true if it is possible to have k non-empty subsets whose sums are all equal. Example: Input: nums = [4,3,2,3,5,2,1], k = 4 Output: ...

**Question 4. Coin Change 2 Leetcode Solution** Problem Statement The Coin Change 2 LeetCode Solution – “Coin Change 2” states that given an array of distinct integers coins and an integer amount, representing a total amount of money. We need to return the count of the total number of different possible combinations that sum to the amount. ...

**Question 5. Frog Jump Leetcode Solution** Problem Statement The Frog Jump LeetCode Solution – “Frog Jump” states that given the list of stones (positions) sorted in ascending order, determine if the frog can cross the river by landing on the last stone (last index of the array). Initially, the frog is on the first stone and ...

**Question 6. Build Array From Permutation Leetcode Solution** Problem Statement The Build Array From Permutation LeetCode Solution – “Build Array From Permutation” states that given zero-based permutation nums, we have to build an array of the same length where ans[i] = nums[nums[i]] for each i in range [0,nums.length-1]. A zero-based permutation nums is an array of distinct integers from 0 ...

**Question 7. Number of Orders in the Backlog Leetcode Solution** Problem Statement The Number of Orders in the Backlog LeetCode Solution – “Number of Orders in the Backlog” states that given the 2D integer array [price, amount, orderType] which denotes that amount orders have been placed of type order type. If the order type is : 0, denotes the current ...

**Question 8. Minimum Cost For Tickets Leetcode Solution** Problem Statement The Minimum Cost For Tickets LeetCode Solution – “Minimum Cost For Tickets” asks you to find the minimum number of dollars you need to travel every day in the given list of days. You will be given an integer array of days. Each day is an integer from ...

**Question 9. Unique Paths II Leetcode Solution** Problem Statement The Unique Paths II LeetCode Solution – “Unique Paths II” states that given the m x n grid where a robot starts from the top left corner of the grid. We need to find the total number of ways to reach the bottom right corner of the grid. ...

**Question 10. Search a 2D Matrix II Leetcode Solution** Problem Statement The Search a 2D Matrix II LeetCode Solution – “Search a 2D Matrix II”asks you to find an efficient algorithm that searches for a value target in an m x n integer matrix matrix. Integers in each row, as well as column, are sorted in ascending order. Example: Input: matrix = [[1,4,7,11,15],[2,5,8,12,19],[3,6,9,16,22],[10,13,14,17,24],[18,21,23,26,30]], target = 5 Output: true ...

**Question 11. Maximum Length of a Concatenated String with Unique Characters Leetcode Solution** Problem Statement The Maximum Length of a Concatenated String with Unique Characters LeetCode Solution – “Maximum Length of a Concatenated String with Unique Characters” says that you’re given an array of strings and you need to choose any subsequence of the given array and concatenate those strings to form the ...

**Question 12. Shortest Word Distance Leetcode Solution** Problem Statement The Shortest Word Distance LeetCode Solution – says that you’re given an array of strings and two different words. We need to return the shortest distance between these two words that appear in the input string. Example: Input: wordsDict = ["practice", "makes", "perfect", "coding", "makes"], word1 = "coding", word2 = "practice" Output: 3 Explanation: Word “coding” occurs at position 4. ...

**Question 13. Moving Average from Data Stream Leetcode Solution** Problem Statement The Moving Average from Data Stream LeetCode Solution – “Moving Average from Data Stream” states that given a stream of integers and a window size k. We need to calculate the moving average of all the integers in the sliding window. If the number of elements in the ...

**Question 14. Set Matrix Zeroes Leetcode Solution** Problem Statement The Set Matrix Zeroes LeetCode Solution – “Set Matrix Zeroes” states that you’re given an m x n integer matrix matrix.We need to modify the input matrix such that if any cell contains the element 0, then set its entire row and column to 0‘s. You must do it in ...

**Question 15. Missing Number Leetcode Solution** Problem Statement The Missing Number LeetCode Solution – “Missing Number” states that given an array of size n containing n distinct numbers between [0,n]. We need to return the number which is missing in the range. Example: Input: nums = [3,0,1] Output: 2 Explanation: We can easily observe that all the ...

**Question 16. Design a Stack With Increment Operation Leetcode Solution** Problem Statement The Design a Stack With Increment Operation Leetcode Solution – states that we need to design a stack that supports the below operations efficiently. Assign the maximum capacity of the stack. Perform the push operation efficiently, if the size of the stack is strictly less than the maximum capacity of ...

**Question 17. Slowest Key Leetcode Solution** The problem Slowest Key Leetcode Solution provides us with a sequence of keys that have been pressed. We are also given an array or vector of times these keys have been released. The sequence of keys is given in the form of a string. So, the problem asked us to ...

**Question 18. 3Sum Leetcode Solution** Problem Statement Given an array of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Notice: that the solution set must not contain duplicate triplets. Example #1 [-1,0,1,2,-1,4] ...

**Question 19. Insert Interval Leetcode Solution** The problem Insert Interval Leetcode Solution provides us with a list of some intervals and one separate interval. Then we are told to insert this new interval among the list of intervals. So, the new interval might be intersecting with intervals that are already in the list, or it might ...

**Question 20. Combination Sum Leetcode Solution** The problem Combination Sum Leetcode Solution provides us an array or list of integers and a target. We are told to find the combinations that can be made using these integers any number of times that add up to the given target. So more formally, we can use the given ...

**Question 21. Island Perimeter Leetcode Solution** Problem Statement In this problem, we are given a grid in form of a 2-D array. grid[i][j] = 0 represents there is water at that point and grid[i][j] = 1 represents land. Grid cells are connected vertically/horizontally but not diagonally. There is exactly one island (a connected component of land ...

**Question 22. Maximum Subarray Leetcode Solution** Problem Statement Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum. Example nums = [-2,1,-3,4,-1,2,1,-5,4] 6 Explanation: [4,-1,2,1] has the largest sum = 6. nums = [-1] -1 Approach 1 (Divide and Conquer) In this approach ...

**Question 23. Rank Transform of an Array Leetcode Solution** The problem Rank Transform of an Array Leetcode Solution provided us with an array of integers. The array or the given sequence is unsorted. We need to assign ranks to each integer in the given sequence. There are some restriction s for assigning the ranks. The ranks must start with ...

**Question 24. Decompress Run-Length Encoded List Leetcode Solution** The problem Decompress Run-Length Encoded List Leetcode Solution states that you are given an array or vector containing a sequence. The sequence has some specific representation. The input sequence is formed from another sequence. We will call that another sequence as the original sequence. As per which the input sequence ...

**Question 25. Replace Elements with Greatest Element on Right Side Leetcode Solution** The problem Replace Elements with Greatest Element on Right Side Leetcode Solution provides us with an array or vector of integers. The problem asked us to replace all the elements with the element that is greatest among all the elements on the right side. So consider if we had an ...

**Question 26. Find Winner on a Tic Tac Toe Game Leetcode Solution** The problem Find Winner on a Tic Tac Toe Game Leetcode Solution asks us to find out the winner of a tic tac toe game. The problem provides us with an array or vector of moves made by the players. We need to go through the moves and judge who ...

**Question 27. Find Common Characters Leetcode Solution** Problem Statement In this problem, we are given a list of string. We have to find out the characters that are common in all the strings. If a character is present in all strings in multiple times, then we have to output the character multiple times. Suppose, we have array ...

**Question 28. Minimum Time Visiting All Points Leetcode Solution** The problem Minimum Time Visiting All Points Leetcode Solution provides us with an array or vector of points on coordinate axes. The problem after providing us with the input asks us to find the minimum time to visit all the points given in the input. When you move one unit ...

**Question 29. Find N Unique Integers Sum up to Zero Leetcode Solution** The problem Find N Unique Integers Sum up to Zero Leetcode Solution, provides us with an integer. It asks us to return n unique integers that sum up to 0. So, the question is pretty simple to understand. So, before diving into the solution. Let us take a look at ...

**Question 30. Partition Array Into Three Parts With Equal Sum Leetcode Solution** The problem Partition Array Into Three Parts With Equal Sum Leetcode Solution provides us with an array or vector and asks if there are three partitions possible of the sequence. Here, by partition we mean that is there two indices i, j such that the sum of elements from start ...

**Question 31. Find Common Characters Leetcode Solution** Problem Statement In this problem, we are given an array of strings. We need to print a list of all characters that appear in every string in the array(duplicates included). That is if a character appears 2 times in every string, but not 3 times, we need to have it ...

**Question 32. Find All Numbers Disappeared in an Array Leetcode Solution** Problem Statement In this problem, we are given an array of integers. It contains elements ranging from 1 to N, where N = size of the array. However, there are some elements that have disappeared and some duplicates are present in their place. Our goal is to return an array ...

**Question 33. Majority Element II Leetcode Solution** In this problem, we are given an array of integers. The goal is to find all the elements which occur more than ⌊N / 3⌋ time in the array where N = size of the array and ⌊ ⌋ is the floor operator. We need to return an array of ...

**Question 34. Contains Duplicate II Leetcode Solution** Problem Statement In this problem we are given an array of integers and we have to check if there exists any duplicate element which are at a distance of at least k to each other. i.e. the difference between the indices of those two same element should be less than ...

**Question 35. Relative Sort Array Leetcode Solution** In this problem, we are given two arrays of positive integers. All elements of the second array are distinct and are present in the first array. However, the first array can contain duplicate elements or elements that are not in the second array. We need to sort the first array ...

**Question 36. Find Words That Can Be Formed by Characters Leetcode Solution** Problem statement In the problem ” Find Words That Can Be Formed by Characters” we are given an array of strings that consists of lower case English alphabets (words) and a string that consists of a set of characters (chars). Our task is to check for each string in the array ...

**Question 37. Number of Equivalent Domino Pairs Leetcode Solution** Problem statement In the problem ” Number of Equivalent Domino Pairs,” we are given a list of dominoes where each domino consists of two values like dominoes[i]=[a,b]. Two dominoes, dominoes[i] =[a,b] and dominoes[j]=[c,d] are equivalent if (a==c and b==d) or (a==d and c==d). Our task is to find out the ...

**Question 38. Pascal’s Triangle II Leetcode Solution** Problem Statement In this problem we have been given Row index(i) of the Pascal Triangle. We have to create a linear array containing the values of the ith row and return it. Row index starts from 0. We know that Pascal’s triangle is a triangle where each number is the ...

**Question 39. Unique Paths Leetcode Solution** The problem Unique Paths Leetcode Solution states that you are given two integers representing the size of a grid. Using the size of the grid, the length, and breadth of the grid. We need to find the number of unique paths from the top left corner of the grid to ...

**Question 40. Number of Good Pairs Leetcode Solution** Problem Statement In this problem an array of integers is given and we have to find out the count of total number of good pairs (a[i], a[j]) where a[i]=a[j]. Example nums = [1,2,3,1,1,3] 4 Explanation: There are 4 good pairs at indices (0,3), (0,4), (3,4), (2,5) . [1,1,1,1] 6 Explanation: ...

**Question 41. Third Maximum Number Leetcode Solution** As the title says, the goal is to find the third maximum integer in a given array of integers. Note that we need to find the distinct third maximum integer in the array. We return the maximum integer in the array when it has no distinct third maximum integer. Example ...

**Question 42. Balanced Binary Tree Leetcode Solution** A binary tree is Height-balanced if the difference of heights of left and right subtree of every node in the tree is at most 1. In this problem, we are going to check for a balanced binary tree. Example 2 / 1 / 4 Not balanced 1 / \ 2 ...

**Question 43. How Many Numbers Are Smaller Than the Current Number Leetcode Solution** Problem Statement In this problem, we are given an array. For each element of this array, we have to find out the number of elements smaller than that element. i.e. for each i (0<=i<arr.length) we have to find out count of elements less than the number arr[i]. For that we ...

**Question 44. Merge Sorted Arrays Leetcode Solution** In the problem “Merge Sorted Arrays”, we are given two arrays sorted in non-descending order. The first array is not fully filled and has enough space to accommodate all elements of the second array as well. We have to merge the two arrays, such that the first array contains elements ...

**Question 45. Search in Rotated Sorted Array Leetcode Solution** Consider a sorted array but one index was picked and the array was rotated at that point. Now, once the array has been rotated you are required to find a particular target element and return its index. In case, the element is not present, return -1. The problem is generally ...

**Question 46. Search Insert Position Leetcode Solution** In this problem, we are given a sorted array and a target integer. We have to find its Search Insert Position. If the target value is present in the array, return its index. Return the index at which the target should be inserted so as to keep the order sorted(in ...

**Question 47. Kids With the Greatest Number of Candies Leetcode Solution** In the problem “Kids With the Greatest Number of Candies”, we are given an array of integers that represents the number of chocolates some children have got and some extra candies that can be distributed in any manner. Now, we need to find: Can every child have the greatest number ...

**Question 48. Running Sum of 1d Array Leetcode Solution** Problem Statement In running sum of 1d array problem we have been given an array nums for which we have to return an array where for each index i in the result array arr[i] = sum( nums[0] … nums[i] ). Example nums = [1,2,3,4] [1,3,6,10] Explanation: Running sum is : ...

**Question 49. Plus One Leetcode Solution** Problem statement In the problem ” Plus One” we are given an array where each element in the array represents a digit of a number. The complete array represents a number. The zeroth index represents the MSB of the number. We can assume that there is no leading zero in ...

**Question 50. Kth largest element in an Array Leetcode Solutions** In this problem, we have to return the kth largest element in an unsorted array. Note that the array can have duplicates. So, we have to find the Kth largest element in the sorted order, not the distinct Kth largest element. Example A = {4 , 2 , 5 , 3 ...

**Question 51. Max Consecutive Ones Leetcode Solution** Problem Statement In Max Consecutive Ones problem a binary array is given. We have to find the maximum number of consecutive ones present in the given array. The input array will only contain 0 and 1. Example [1,1,0,1,1,1] 3 Explanation: The first two digits or the last three digits are ...

**Question 52. Rearrange Array such that arr[i] >= arr[j] if i is even and arr[i] <= arr[j] if i is odd and j < i** Suppose you have an integer array. The problem statement asks to rearrange the array in such a way that the elements at even position in an array should be greater than all elements before it and the elements at odd positions should be less than the elements before it. Example ...

**Question 53. Sort Array By Parity II Leetcode Solution** Problem statement In the problem ” Sort Array By Parity II,” we are given a parity array where all the elements are positive integers. The array contains an even number of elements. The array contains an equal number of even and odd elements. Our task is to rearrange the elements ...

**Question 54. Count pair with Given Sum** In problem “count pair with given sum” we have given an integer array[] and another number say ‘sum’, you have to determine whether any of the two elements in a given array has a sum equal to “sum”. Example Input: arr []={1,3,4,6,7} and sum = 9. Output: “ Elements found ...

**Question 55. Group Multiple Occurrence of Array Elements Ordered by first Occurrence** You are given a question in which you have given an unsorted array with multiple occurrences of numbers. The task is to group all the multiple occurrences of array elements ordered by first occurrence. Meanwhile, the order should be the same as the number comes. Example Input: [ 2, 3,4,3,1,3,2,4] ...

**Question 56. Maximum difference between frequency of two elements such that element having greater frequency is also greater** Suppose, you have an integer array. The problem statement asks to find out the maximum difference between the frequency of any two distinct elements of a given array, but the element with the greater frequency should also be greater in value than the other integer. Example Input: arr[] = {2,4,4,4,3,2} ...

**Question 57. Maximize Sum of Array after K Negations Leetcode Solution** This post is on Maximize Sum Of Array After K Negations Leetcode Solution Problem statement In the problem ” Maximize Sum Of Array After K Negations” we are given an array arr and a value K. The array consists of integer values. We can change the value of arr[i] to ...

**Question 58. Smallest Subarray with k Distinct Numbers** Suppose, you have an integer array and a number k. The problem statement asks to find out the smallest sub-array of range (l, r) inclusively, in such a way there are exactly k distinct numbers present in that smallest sub-array. Example Input: {1, 2, 2, 3, 4, 5, 5} k=3 ...

**Question 59. All Unique Triplets that Sum up to a Given Value** We have given an array of integers and a given number called ‘sum’. The problem statement asks to find out the triplet that adds up to the given number ‘sum’. Example Input: arr[] = {3,5,7,5,6,1} sum=16 Output: (3, 7, 6), (5, 5, 6) Explanation: Triplet which equals to the given ...

**Question 60. Longest Subarray Having Count of 1s One More than Count of 0s** We have given an array of integers. An array contains 1’s and 0’s only. The problem statement asks to find out the length of the longest Sub-Array which having the quantity of 1’s digit is just one more than the count of 0’s in a sub-array. Example Input: arr[] = ...

**Question 61. Maximum Array from Two given Arrays Keeping Order Same** Suppose we have two integers array of same size n. Both of the arrays can contain common numbers as well. The problem statement asks to form the resultant array that contains the ‘n’ maximum values from both of the arrays. The first array should be prioritized (elements of the first ...

**Question 62. Guess Number Higher or Lower II** Problem Statement “Guess Number Higher or Lower II” states that we are going to play a game that is called Guess Game. The game says that I pick a number from 1 to n. Whenever you guess the number which I have not picked, I m going to say you ...

**Question 63. Rearrange an Array Such that arr[i] is equal to i** “Rearrange an array such that arr[i]=i” problem states that you are given an array of integers ranging from 0 to n-1. Since all the elements may not be present in the array, then in place of them -1 is there. The problem statement asks to rearrange the array in such ...

**Question 64. Segregate 0s and 1s in an Array** Problem Statement Suppose you have an integer array. The problem “Segregate 0s and 1s in an array” asks to segregate the array in two parts, in 0s and in 1s. The 0’s should be on the left side of the array and 1’s on the right side of the array. ...

**Question 65. Find Largest d in Array such that a + b + c = d** Problem Statement Suppose you have an array of integers. Input values are all distinct elements. The problem “Find largest d in array such that a + b + c = d” asks to find out the largest element ‘d’ in the set such that a + b + c = ...

**Question 66. Maximum Number of Chocolates to be Distributed Equally Among k Students** “The maximum number of chocolates to be distributed equally among k students” states that you are given n boxes that have some chocolates in it. Suppose there are k students. The task is to distribute the maximum number of chocolates among k students equally, by selecting consecutive boxes. We can ...

**Question 67. Maximum Consecutive Numbers Present in an Array** Problem Statement Suppose you have an array of integers of size N. The problem “Maximum consecutive numbers present in an array” asks to find out the maximum count of consecutive numbers that could be scattered in an array. Example arr[] = {2, 24, 30, 26, 99, 25} 3 Explanation: The ...

**Question 68. Queries for Number of Distinct Elements in a Subarray** We have given an array of integer and a number of queries and we have to find out the number of all the distinct elements we have within the given range, the query consists of two numbers left and right, this is the given range, with this given range we ...

**Question 69. Range Minimum Query (Square Root Decomposition and Sparse Table)** In the range minimum query problem we have given a query and an integer array. Each query contains the range as left and right indexes for each range. The given task is to determine the minimum of all number that lies within the range. Example Input: arr[] = {2, 5, ...

**Question 70. Range Sum Query using Sparse Table** In the range sum query using sparse table problem we have a range query and given an integer array. The given task is to find out the sum of all integers that comes in the range. Example Input: arr[] = {1,4,6,8,2,5} Query: {(0, 3), (2, 4), (1, 5)} Output: 19 16 25 ...

**Question 71. Count and Toggle Queries on a Binary Array** An array of size n has been given as an input value. The problem “Count and Toggle Queries on a Binary Array” asks to perform some of the queries which are given below, queries can vary in a random manner. The queries are ⇒ Toggle query ⇒ toggle(starting, ending), this ...

**Question 72. Queries for Decimal Values of Subarrays of a Binary Array** Write Queries for decimal values of subarrays of a binary array in a given binary array. The problem statement asks to find out the decimal number so formed with the help of range in a binary array. Example Input: arr[] = {1, 0, 1, 1, 0, 0, 1, 1} Query(1, ...

**Question 73. Maximize Elements Using Another Array** Suppose, we have given two integers array of same size n. Both of the arrays contain positive numbers. The problem statement asks to maximize the first array by using the second array element keeping the second array as a priority (elements of the second array should appear first in output). ...

**Question 74. Minimum swaps required to bring all elements less than or equal to k together** The problem “Minimum swaps required to bring all elements less than or equal to k together” states that you have an integer array. The problem statement asks to find out the smallest count of swaps that will be required to get the elements together which are less than or equal ...

**Question 75. Find First and Last Position of Element in Sorted Array Leetcode Solution** Problem statement In this article titled “Find First and Last Position of Element in Sorted Array Leetcode Solution,” we will discuss the solution to a leetcode problem. In the given problem we are given an array. We are also given a target element. Elements in the array are sequenced in ...

**Question 76. Monotonic Array LeetCode Solution** Problem statement In the problem “Monotonic Array” we are given an array. Our task is to check if the array is a monotonic array or not. A monotonic array is an array where elements are either sorted in increasing order or in decreasing order. If the array is sorted in ...

**Question 77. Maximum subsequence sum such that no three are consecutive** The problem “Maximum subsequence sum such that no three are consecutive ” states that you are given an array of integers. Now you need to find a subsequence that has the maximum sum given that you cannot consider three consecutive elements. To recall, a subsequence is nothing but an array ...

**Question 78. Find duplicates in a given array when elements are not limited to a range** The problem “Find duplicates in a given array when elements are not limited to a range” states that you have an array consisting of n integers. The problem statement it to find out the duplicate elements if present in the array. If no such element exists return -1. Example [ ...

**Question 79. Check if Array Contains Contiguous Integers With Duplicates Allowed** You are given an array of integers which can contain duplicate elements as well. The problem statement asks to find out if it is a set of contiguous integers, print “Yes” if it is, print “No” if it is not. Example Sample Input: [2, 3, 4, 1, 7, 9] Sample ...

**Question 80. The K Weakest Rows in a Matrix Leetcode Solution** Problem statement In the problem ” The K Weakest Rows in a Matrix” we are given a matrix of n rows and m columns. matrix is filled with 0 or 1. The special thing about this matrix is that all the ones are towards the left-hand side of each row ...

**Question 81. Capacity To Ship Packages Within D Days Leetcode Solution** Problem statement In the problem ” Capacity To Ship Packages Within D Days,” we have packets in port A that must be transferred to port B in D days. we are given a weights array that contains the weight of each packet and the number of days in which we ...

**Question 82. Can Make Arithmetic Progression From Sequence Leetcode Solution** Problem statement In the problem ” Can Make Arithmetic Progression From Sequence” we are given an array, now we need to answer if it is possible to generate an Arithmetic Progression by rearranging the sequence. Example arr = [3,1,5] true Explanation: We can rearrange the array as{1,3,5} which forms an ...

**Question 83. Best Time to Buy and Sell Stock III Leetcode Solution** Problem statement In the problem “Best Time to Buy and Sell Stock III,” we are given an array where each element in the array contains the price of the given stock on that day. The definition of the transaction is buying one share of stock and selling that one share ...

**Question 84. Best Time to Buy and Sell Stock II Leetcode Solution** Problem statement In the problem “Best Time to Buy and Sell Stock II,” we are given an array where each element in the array contains the price of the given stock on that day. The definition of the transaction is buying one share of stock and selling that one share ...

**Question 85. Best Time to Buy and Sell Stock with Transaction Fee Leetcode Solution** Problem statement In the problem “Best Time to Buy and Sell Stock with Transaction Fee,” we are given an array where each element in the array contains the price of the given stock on that day. The definition of the transaction is buying one share of stock and selling that ...

**Question 86. Count of index pairs with equal elements in an array** Suppose, we have given an integer array. The problem “Count of index pairs with equal elements in an array” asks to find out the no of pair of indices (i,j) in such a way that arr[i]=arr[j] and i is not equal to j. Example arr[] = {2,3,1,2,3,1,4} 3 Explanation Pairs ...

**Question 87. Find Sum of all unique sub-array sum for a given array** Suppose you have an array of integers. The problem “Find Sum of all unique sub-array sum for a given array” asks to find out the sum of all unique sub-arrays (Sub-array sum is the sum of each sub-array’s elements). By unique sub-array sum, we meant to say that no sub-array ...

**Question 88. Minimum Sum Path in a Triangle** Problem Statement The problem “Minimum Sum Path in a Triangle” states that you are given a sequence in the form of a triangle of integers. Now starting from the top row what is the minimum sum you can achieve when you reach the bottom row? Example 1 2 3 5 ...

**Question 89. Longest subarray not having more than K distinct elements** The problem “Longest subarray not having more than K distinct elements” states that suppose you have an array of integers, the problem statement asks to find out the longest sub-array that having not greater than k different elements. Example arr[] = {4, 3, 5, 2, 1, 2, 0, 4, 5} ...

**Question 90. Given an Array of Pairs Find all Symmetric Pairs in it** Find all symmetric pairs – You are given some pairs of an array. You have to find out the symmetric pairs in it. The symmetric pair is said to be symmetric when in pairs say (a, b) and (c, d) in which ‘b’ is equal to ‘c’ and ‘a’ is ...

**Question 91. Minimum operation to make all elements equal in array** The problem “Minimum operation to make all elements equal in array” states that you are given an array with some integers in it. You have to find out the minimum operations that can be done to make an array equal. Example [ 1,3,2,4,1] 3 Explanation Either 3 subtractions can be ...

**Question 92. Construct Binary Tree from given Parent Array representation** The problem “Construct Binary Tree from given Parent Array representation” states that you are given an array. This input array represents a binary tree. Now you need to construct a binary tree on the basis of this input array. The array stores the index of parent node at each index. ...

**Question 93. Find subarray with given sum (Handles Negative Numbers)** The problem “Find subarray with given sum (Handles Negative Numbers)” states that you are given an integer array, containing negative integers as well and a number called “sum”. The problem statement asks to print the sub-array, which sums up to a given number called “sum”. If more than one sub-array ...

**Question 94. Length of the largest subarray with contiguous elements** The problem “Length of the largest subarray with contiguous elements” states that you are given an integer array. The problem statement asks to find out the length of the longest contiguous sub-array of which elements can be arranged in a sequence (continuous, either ascending or descending). The numbers in the ...

**Question 95. Count number of triplets with product equal to given number** The problem “Count number of triplets with product equal to given number” states that we are given an integer array and a number m. The problem statement asks to find out the total number of triplets of with product equals to m. Example arr[] = {1,5,2,6,10,3} m=30 3 Explanation Triplets ...

**Question 96. Maximum difference between first and last indexes of an element in array** Suppose, you have an array of integers. The problem “Maximum difference between first and last indexes of an element in array” asks to find out the difference between the first and last index of each number present in an array such that the difference is being maximum of all. Example ...

**Question 97. Find four elements that sum to a given value (Hashmap)** The problem “Find four elements that sum to a given value (Hashmap)” states that suppose, you have an integer array and a number called sum. The problem statement asks to determine if four elements present in the array which sums up to the given value “sum”. If true, then function ...

**Question 98. Longest subsequence such that difference between adjacents is one** The problem “Longest subsequence such that difference between adjacents is one” states that you are given an integer array. Now you need to find the length of longest subsequence such that the difference of adjacent elements is 1. Example 1 2 3 4 7 5 9 4 6 Explanation As ...

**Question 99. Find all triplets with zero sum** The problem “Find all triplets with zero sum” states that you are given an array containing positive and negative number both. The problem statement asks to find out the triplet with the sum equal to 0. Example arr[] = {0,-2,1,3,2,-1} (-2 -1 3) (-2 0 2) (-1 0 1) Explanation ...

**Question 100. Check if a given array contains duplicate elements within k distance from each other** The problem “Check if a given array contains duplicate elements within k distance from each other” states that we have to check for duplicates in given unordered array within the range of k. Here the value of k is smaller than the given array. Examples K = 3 arr[] = ...

**Question 101. Pair with given product** The problem “Pair with given product” states that you are given an integer array and a number “x”. Determine, whether an array consists of a pair of which product equals ‘x’ exist in the given input array. Example [2,30,12,5] x = 10 Yes, it has Product Pair Explanation Here 2 ...

**Question 102. Maximum Distance in Array** The problem “Maximum Distance in Array” states that you are given “n” no. of arrays and all the arrays are given in ascending order. Your task is to find the maximum difference/absolute difference of two numbers in an array and we can define the maximum distance between two numbers as ...

**Question 103. First element occurring k times in an array** We have given a number ‘k’ and an integer array. The problem “First element occurring k times in an array” says to find out the first element in the array which occurs exactly k times in an array. If there is no element in the array which occurs k times ...

**Question 104. Print all subarrays with 0 sum** You are given an integer array, your task is to print all the possible sub-arrays with sum is equal to 0. So we need to Print all subarrays with 0 sum. Example arr[] = {-2, 4, -2, -1, 1, -3, 1, 5, 7, -11, -6} Sub-Array found from 0 index ...

**Question 105. Contains Duplicate** We are given an array and it may be containing duplicates elements or maybe not. So we need to check if it contains duplicate. Examples [1, 3, 5, 1] true [“apple”, “mango”, “orange”, “mango”] true [22.0, 4.5, 3.98, 45.6, 13.54] false Approach We can check an array in several ways ...

**Question 106. Form minimum number from given sequence** The problem “Form minimum number from given sequence” states that you are given some pattern of I’s and D’s only. The meaning of I stands for increasing and for decreasing we are provided with D. The problem statement asks to print the minimum number which satisfies the given pattern. We have ...

**Question 107. Range Queries for Longest Correct Bracket Subsequence** You are given a sequence of some brackets subsequence, in other words, you are given brackets like ‘(’ and ‘)’ and you are given a query range as a starting point and ending point. The problem “Range Queries for Longest Correct Bracket Subsequence” asks to find out the maximum length ...

**Question 108. Largest subarray with equal number of 0s and 1s** You are given an array of integers. The integers are only 0 and 1 in the input array. The problem statement asks to find out the largest sub-array that can have equal count of 0s and 1s. Example arr[]={0,1,0,1,0,1,1,1} 0 to 5 (total 6 elements) Explanation From the array position ...

**Question 109. Binary array after M range toggle operations** You are given a binary array, which consists of 0 initially and Q number of queries. The problem statement asks to toggle the values (converting 0s into 1s and 1s into 0s). After the Q queries performed, print the resultant array. Example arr[] = {0, 0, 0, 0, 0} Toggle(2,4) ...

**Question 110. Non-overlapping sum of two sets** Problem Statement The problem “Non-overlapping sum of two sets” states that you are given two arrays as input values as arrA[] and arrB[] of the same size n. Also, both of the arrays have distinct elements individually and some common elements. Your task is to find out the total sum ...

**Question 111. Find all pairs (a, b) in an array such that a % b = k** Problem Statement The problem “Find all pairs (a, b) in an array such that a % b = k” states that you are given an array of integers and an integer value called k. The problem statement asks to find out the pair in such a way that that x ...

**Question 112. Range LCM Queries** Problem Statement The problem “Range LCM Queries” states that you have an integer array and q number of queries. Each query contains the (left, right) as a range. The given task is to find out the LCM(left, right), i.e, LCM of all the number that comes in the range of ...

**Question 113. Queries for GCD of all numbers of an array except elements in a given range** Problem Statement The “Queries for GCD of all numbers of an array except elements in a given range” problem states that you will be given an integer array and a q number of queries. Each query contains the number left and right. The problem statement asks to find out the ...

**Question 114. Find whether a subarray is in form of a mountain or not** Problem Statement The problem “Find whether a subarray is in form of a mountain or not” states that you are given an integer array and a range. The problem statement asks to find out whether the sub-array formed between the given range is in form of a mountain form or ...

**Question 115. Subset Sum Problem in O(sum) space** Problem Statement The “Subset sum in O(sum) space” problem states that you are given an array of some non-negative integers and a specific value. Now find out if there is a subset whose sum is equal to that of the given input value. Example Array = {1, 2, 3, 4} ...

**Question 116. Find Index of Closing Bracket for a Given Opening Bracket in an Expression** Problem Statement Given a string s of length/size n and an integer value representing the index of an opening square bracket. Find index of closing bracket for a given opening bracket in an expression. Example s = "[ABC[23]][89]" index = 0 8 s = "[C-[D]]" index = 3 5 s ...

**Question 117. Gold Mine Problem** Problem Statement The “Gold Mine problem” states that you are given a 2D grid having some non-negative coins placed in each cell of the given grid. Initially, the miner is standing at the first column but there is no restriction on the row. He can start in any row. The ...

**Question 118. Longest Increasing Consecutive Subsequence** Subsequences are another topic loved by interviewers. Tweaking them around can always give them new opportunities for testing candidates. It can check the candidate’s ability to think and analyze things and come up with the best and optimal solutions. Today we are solving a subsequence problem that will be doing ...

**Question 119. Best Time to Buy and Sell Stock** Problem Statement The problem “Best Time to Buy and Sell Stock” states that you are given an array of prices of length n, where the ith element stores the price of stock on ith day. If we can make only one transaction, that is, to buy on one day and ...

**Question 120. Top K Frequent Elements** Problem Statement In top K frequent elements we have given an array nums[], find the k most frequently occurring elements. Examples nums[] = {1, 1, 1, 2, 2, 3} k = 2 1 2 nums[] = {1} k = 1 1 Naive Approach for Top K Frequent Elements Build ...

**Question 121. Bubble sort using two Stacks** Problem Statement The problem “Bubble sort using two Stacks” states that you are given an array a[ ] of size n. Create a function to sort the given array a[ ] using a bubble sort paradigm with two stack data structures. Example a[ ] = {15, 12, 44, 2, 5, ...

**Question 122. Sort an array according to the order defined by another array** Problem Statement You are given two arrays of integers arr1[] and arr2[]. The problem “Sort an array according to the order defined by another array” asks to sort the first array according to the second array so that the numbers in first array will be relatively sorted off all the ...

**Question 123. Construction of Longest Increasing Subsequence (N log N)** Problem Statement You are given an array of integers. The problem “Construction of Longest Increasing Subsequence (N log N)” asks to construct the longest increasing subsequence. Example arr[]={1, 4, 7, 2, 9, 6, 12, 3 } 12, 9, 7, 4, 1 and the size of this longest increasing subsequence is ...

**Question 124. Minimum time required to rot all oranges** Problem Statement The problem “Minimum time required to rot all oranges” states that you are given a 2D array, every cell has one of the three possible values 0, 1 or 2. 0 means an empty cell. 1 means a fresh orange. 2 means a rotten orange. If a rotten ...

**Question 125. Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’** Problem Statement The problem ” Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’ ” states that you have an “n” sized array containing integers. The numbers in the array are in a range of 0 to n-1. The problem statement asks to rearrange the array in ...

**Question 126. Maximum Product Subarray** Problem Statement The problem “Maximum Product Subarray” states that you are given an array of integer containing both positive and negative numbers. The problem statement asks to find out the maximum product of the sub-array. Example arr[] = { 2, -2, 3, 5} 15 Explanation The elements in the sub-array ...

**Question 127. Convert array into Zig-Zag fashion** Problem Statement The problem “Convert array into Zig-Zag fashion” states that you are given an – of integers. The problem statement asks to sort the array in a zig-zag manner such that the elements in the array will look like à a < b > c < d > e ...

**Question 128. First negative integer in every window of size k** Problem Statement The problem “First negative integer in every window of size k” states that you are given an array containing positive and negative integers, for every window of size k print the first negative integer in that window. If there is no negative integer in any window then output ...

**Question 129. Distance of nearest cell having 1 in a binary matrix** Problem Statement The problem “Distance of nearest cell having 1 in a binary matrix” states that you are given a binary matrix(containing only 0s and 1s) with at least one 1. Find the distance of the nearest cell having 1 in the binary matrix for all the elements of the ...

**Question 130. Form Minimum Number From Given Sequence** Problem Statement The problem “Form Minimum Number From Given Sequence states that you are given a string s of length/size n representing a pattern of characters ‘I’ i.e. increasing and ‘D’ i.e. decreasing only. Print the minimum number for the given pattern with unique digits from 1-9. For instance – ...

**Question 131. Number Of Longest Increasing Subsequence** Problem Statement The problem “Number Of Longest Increasing Subsequence” states that you are given an array a[ ] of size n. Print the number of longest increasing subsequences in it. Example a[ ] = {1, 2, 5, 4, 7} 2 Explanation: The longest increasing subsequences can be seen in the ...

**Question 132. Find Minimum In Rotated Sorted Array** Problem Statement “Find Minimum In Rotated Sorted Array” states that you are given a sorted array of size n which is rotated at some index. Find the minimum element in the array. Example a[ ] = {5, 1, 2, 3, 4} 1 Explanation: If we arrange the array in sorted ...

**Question 133. Implementation of Deque using circular array** Problem Statement “Implementation of Deque using circular array” asks to implement the following functions of a Deque(Doubly Ended Queue) using circular array, insertFront(x) : insert an element x at the front of Deque insertRear(x) : insert an element x at the rear of Deque deleteFront() : delete an element from ...

**Question 134. Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest** Problem Statement Suppose you have an integer array. The problem “Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest, ..” asks to rearrange the array in such a way that the smallest number comes first and then the largest number, then second smallest and then the second ...

**Question 135. Rearrange array such that even positioned are greater than odd** Problem Statement Suppose you have an integer array. The problem “Rearrange array such that even positioned are greater than odd” asks to rearrange the array such the elements at even position in an array should be greater than the element just before it. Arr[i-1] < = Arr[i], if position ‘i’ ...

**Question 136. Arrange given numbers to form the biggest number** Problem Statement Suppose you have an array of integers. The problem “Arrange given numbers to form the biggest number” asks to rearrange the array in such a manner that the output should be the maximum value which can be made with those numbers of an array. Example [34, 86, 87, ...

**Question 137. Remove duplicates from sorted array** Problem Statement “Remove duplicates from sorted array” states that you are given a sorted array of size N. You need to remove the duplicate elements from the array. Print the array containing unique elements after the removal of duplicate elements. Example a [] = {1, 1, 1, 1} {1} Explanation: ...

**Question 138. Count subarrays having total distinct elements same as original array** Problem Statement “Count subarrays having total distinct elements same as original array” states that you are given an integer array. The problem statement asks to find out the total number of sub-arrays that contain all distinct elements as present in an original array. Example arr[] = {2, 1, 3, 2, ...

**Question 139. Product of array except self** Problem Statement “Product of array except self” problem, states that you are given an array a [ ]. Print another array p [ ] of the same size such that value at i’th index of array p is equal to the product of all the elements of the original array ...

**Question 140. First missing positive** Problem Statement “First missing positive” problem states that you are given an array a[ ] (sorted or unsorted) of size n. Find the first positive number that is missing in this array. Example a[ ] = {1, 3, -1, 8} 2 Explanation: If we sort the array we get {-1, ...

**Question 141. Contiguous Array Leetcode** Problem Statement “Contiguous Array Leetcode” problem states that you are given an array a[ ] of size n consists of 1’s and 0’s only. Find the longest subarray in which the number of 1’s is equal to the number of 0’s. Example a[ ] = {1, 0, 1, 1, 1, ...

**Question 142. Numbers with prime frequencies greater than or equal to k** Problem Statement Problem “Numbers with prime frequencies greater than or equal to k” states that you are given an array of integers size n and an integer value k. All the numbers inside it are prime numbers. The problem statement asks to find out the numbers which appear in the ...

**Question 143. Find pairs with given sum such that elements of pair are in different rows** Problem Statement “Find pairs with given sum such that elements of pair are in different rows” problem states that you are given a matrix of integers and a value called “sum”. The problem statement asks to find out all the pairs in a matrix that sums up to a given ...

**Question 144. Common elements in all rows of a given matrix** Problem Statement “Common elements in all rows of a given matrix” problem state that, you are given a matrix of M*N. The problem statement asks to find out all the common elements in a given matrix in each row of the matrix in O(M*N) time. Example arr[]={{12, 1, 4, 5, ...

**Question 145. Collect maximum points in a grid using two traversals** Problem Statement We are given a matrix of size “n x m”, and we need to collect maximum points in a grid using two traversals. If we are standing at cell i,j then we have three options to go to cell i+1, j or i+1, j-1or i+1, j+1. That is ...

**Question 146. Given two unsorted arrays find all pairs whose sum is x** Problem Statement Given two unsorted arrays, find all pairs whose sum is x problem states that you are given two arrays of integers that are unsorted and a value called sum. The problem statement asks to find out the total number of pairs and print all those pairs that add ...

**Question 147. Sort elements by frequency** Problem Statement You are given an array of integers, some numbers are repeated in it. The problem statement asks to print the number in the array in decreasing order according to their frequency that is to sort elements by frequency. Example arr[]={3,4,3,1,2,9,2,9,2,5 } 2 2 2 3 3 9 9 ...

**Question 148. Find the first repeating element in an array of integers** Problem Statement Find the first repeating element in an array of integers problem states that you are given an array of integer. It asks to find out the first repeating element from the array and print that number. Example arr[] = {2,6,9,3,1,9,1} 9 Explanation: In the given array there are ...

**Question 149. Find the subarray with least average** Problem Statement You have given an integer array and a number k. The problem statement asks to find the subarray with least average, which is to find out the sub-array of k elements, which has the minimum average. Example arr[] = {12, 34, 20, 30, 24, 45} k = 3 Sub-Array of [0, 2] has a minimum average. Explanation: ...

**Question 150. Find minimum number of merge operations to make an array palindrome** Problem Statement You are given an array of integers. The problem statement asks to find minimum number of merge operations to make an array palindrome, i.e. find out the minimum number of merging operations to be done on the array to make it a palindrome. Merging operation simply means that ...

**Question 151. Check given array of size n can represent BST of n levels or not** Problem Statement Given an array with n elements, check given array of size n can represent BST of n levels or not. That is to check whether the binary search tree constructed using these n elements can represent a BST of n levels. Examples arr[] = {10, 8, 6, 9, ...

**Question 152. Find maximum average subarray of k length** Problem Statement You are given an array of integers and a number k. The problem statement asks to find maximum average subarray of k length. Subarray is nothing but an array composed from a contiguous block of the original array’s elements Example arr[] = {1,3,12,34,76,10} [2, 4] Explanation: Array starting ...

**Question 153. Printing brackets in Matrix Chain Multiplication Problem** Problem Statement We need to find the order of multiplication of matrices such that the number of operations involved in the multiplication of all the matrices is minimized. Then we need to print this order i.e. printing brackets in matrix chain multiplication problem. Consider you have 3 matrices A, B, ...

**Question 154. Find minimum difference between any two elements** Problem Statement You are given an array of integers. The problem statement asks to find minimum difference between any two elements given in the array. Example arr[] = {11,1,6,8,20,13} 2 Explanation: Minimum difference between 11 and 13 is 2. arr[] = {19,14,80,200,32,29} 3 Explanation: Minimum difference between 32 and 29 ...

**Question 155. Largest rectangular sub-matrix whose sum is 0** Problem Statement Find the maximum size sub-matrix in a 2D array whose sum is zero. A sub-matrix is nothing but a 2D array inside of the given 2D array. So, you have a matrix of signed integers, you need to calculate the sum of sub-matrices and find the matrix with ...

**Question 156. Maximum sum rectangle in a 2D matrix** Problem Statement Find the maximum sum rectangle in a 2D matrix i.e. to find a sub-matrix with maximum sum. A sub-matrix is nothing but a 2D array inside of the given 2D array. So, you have a matrix of signed integers, you need to calculate the sum of sub-matrices and ...

**Question 157. Maximum Sum Increasing Subsequence** Problem Statement You are given an array of integers. Your task is to find out the maximum sum subsequence within the array in such a way that the numbers in subsequence should be ordered in a sorted manner in increasing order. A subsequence is nothing but a sequence that we ...

**Question 158. Largest Sum Contiguous Subarray** Problem Statement You are given an array of integers. The problem statement asks to find out the largest sum contiguous subarray. This means nothing but to find a subarray (continuous elements) which has the largest sum among all other subarrays in the given array. Example arr[] = {1, -3, 4, ...

**Question 159. Matrix Chain Multiplication** In the matrix chain multiplication II problem, we have given the dimensions of matrices, find the order of their multiplication such that the number of operations involved in multiplication of all the matrices is minimized. Consider you have 3 matrices A, B, C of sizes a x b, b x ...

**Question 160. Sorted Array to Balanced BST** In sorted array to balanced BST problem, we have given an array in sorted order, construct a Balanced Binary Search Tree from the sorted array. Examples Input arr[] = {1, 2, 3, 4, 5} Output Pre-order : 3 2 1 5 4 Input arr[] = {7, 11, 13, 20, 22, ...

**Question 161. Single Number** Given an array a[ ] of size n. All the elements in the array are present twice except for 1. Find the element which appears only once or in other words we say that find the single number. Example Input : a[ ] = {1, 3, 5, 5, 2, 1, 3} ...

**Question 162. Subset Leetcode** In Subset Leetcode problem we have given a set of distinct integers, nums, print all subsets (the power set). Note: The solution set must not contain duplicate subsets. An array A is a subset of an array B if a can be obtained from B by deleting some (possibly, zero ...

**Question 163. Shuffle an Array** Given an array or set which contains n elements. Here the elements are unique or there is no repetition. Shuffle an array(or a set) of numbers without duplicates. Example // Init an array with set 2, 4, 3 and 1. int[] nums = {2, 4, 3, 1}; Shuffle object = ...

**Question 164. Maximal Square** In the maximal square problem we have given a 2D binary matrix filled with 0’s and 1’s, find the largest square containing only 1’s, and return its area. Example Input: 1 0 1 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 1 0 ...

**Question 165. Dividing Array into Pairs With Sum Divisible by K** The dividing array into pairs with sum divisible by K is a problem which is asked in interviews with various tweaks now and then. Those who know me know my habit of converting these problems into stories. In this article let us look into this problem. Situation To Understand The ...

**Question 166. Count Distinct Elements in Every Window of Size K** Subsets are something which we have been dealing with for some time now. In the last episode, we covered the number of subsets we could make with distinct even numbers. This time we count distinct elements in every window of size K. Section-1 About the problem. Given an unsorted array ...

**Question 167. Find Three Element From Different Three Arrays Such That a + b + c = sum** Three Sum is a problem loved by interviewers. It is a problem I was personally asked during the Amazon interview. So, without wasting any more time let us get to the problem. An array that has both positive and negative numbers. Three numbers that sum up to zero/can be modified, ...

**Question 168. Word Search** Word search is something like the word-finding puzzles at some time in our life. Today I bring to the table a modified crossword. My readers must be a bit perplexed as to what I am talking about. Without wasting any more time let us get to the problem statement Can ...

**Question 169. K Empty Slots** K empty slots correctly present a gardener’s dilemma, trying to pick flowers that suit our condition. Our gardener has a field of N-slots. Mr gardener has planted a flower in each one of the slots. Each flower will bloom on a certain unique day. Also, we have planted evergreen flowers. ...

**Question 170. Count Pairs Whose Products Exist in Array** In count pairs whose products exist in array problem we have given an array, count all the distinct pairs whose product value is present in the array. Example Input A[]={2, 5, 6, 3, 15} Output Number of distinct pairs whose product exists in the array is: 2 Pairs are: (2, ...

**Question 171. Print All Distinct Elements of a Given Integer Array** Given an integer array, print all distinct elements in the array. The given array may contain duplicates and the output should print every element only once. The given array is not sorted. Example Input: nums[]= {12, 10, 9, 45, 2, 10, 10, 45} Output: 12, 10, 9, 45, 2 Approach ...

**Question 172. Pair of Positive Negative Values in an Array** In pair of positive negative values in an array problem we have given an array A of distinct integers, print all the pairs having positive value and negative value of a number that exists in the array. We need to print pairs in order of their occurrences. A pair whose ...

**Question 173. Count Pairs With Given Sum** Given an integer array of size n, and an integer ‘K’, you need to count the number of pairs(need not to be unique) present in the array whose sum is equal to ‘K’. Example Input: Arr={1, 5, 7, 1} K=6 Output: 2 Brute force solution for Count Pairs With Given Sum Main idea ...

**Question 174. Insert Delete GetRandom** In Insert Delete GetRandom problem we need to design a data structure that supports all following operations in average O(1) time. insert(val): Inserts an item val to the set if not already present. remove(val): Removes an item val from the set if present. getRandom: Returns a random element from the current set ...

**Question 175. Merge Overlapping Intervals** In merge overlapping intervals problem we have given a collection of intervals, merge and return all overlapping intervals. Example Input : [[2, 3], [3, 4], [5, 7]] Output: [[2, 4], [5, 7]] Explanation: We can merge [2, 3] and [3, 4] together to form [2, 4] Approach for finding Merge ...

**Question 176. Median of Two Sorted Arrays** Given two sorted arrays A and B of size n and m respectively. Find the median of the final sorted array obtained after merging the given two arrays or in other words, we say that find median of two sorted arrays. ( Expected time complexity: O(log(n)) ) Approach 1 for ...

**Question 177. Maximum Product Subarray** In the maximum product subarray problem, we have given an array of integers, find the contiguous sub-array with atleast one element which has the largest product. Example Arr=[ 0, -1, 0 ,1 ,2, -3] Maximum product = 2 Arr=[-1, -1, -1] Maximum product = -1 Arr=[0, -1, 0, -2, 0] ...

**Question 178. Find Maximum of Minimum for Every Window Size in a Given Array** Given an array a[ ] of size n. For every window size that varies from 1 to n in array print or find maximum of minimum for every window size in a given array. Example Input : a[ ] = {10, 20, 30, 50, 10, 70, 30} Output : 70 30 20 ...

**Question 179. Minimum Size Subarray Sum** Given an array nums of a positive integer and a sum s, find the minimum size of a contiguous subarray of nums such that whose sum equals to or greater than s(given value). Example Input: nums[] = {2, 3, 1, 2, 4, 3} s = 7 Output: 2 {Subarray [4, ...

**Question 180. Search an Element in Sorted Rotated Array** In search in sorted rotated array problem we have given a sorted and rotated array and an element, check if the given element is present in the array or not. Examples Input nums[] = {2, 5, 6, 0, 0, 1, 2} target = 0 Output true Input nums[] = {2, ...

**Question 181. Maximum Product Subarray** Given an array of n integers, find the maximum product obtained from a contiguous subarray of the given array. Examples Input arr[] = {-2, -3, 0, -2, -40} Output 80 Input arr[] = {5, 10, 6, -2, 1} Output 300 Input arr[] = {-1, -4, -10, 0, 70} Output 70 ...

**Question 182. Set Matrix Zeroes** In the set matrix zeroes problem, we have given a (n X m) matrix, if an element is 0, set its entire row and column 0. Examples Input: { [1, 1, 1] [1, 0, 1] [1, 1, 1] } Output: { [1, 0, 1] [0, 0, 0] [1, 0, 1] ...

**Question 183. 3 Sum** In 3 Sum problem, we have given an array nums of n integers, find all the unique triplets that sum up to 0. Example Input: nums = {-1, 0, 1, 2, -1, -4} Output: {-1, 0, 1}, {-1, 2, -1} Naive Approach for 3 Sum problem The Brute force approach ...

**Question 184. Find The Duplicate Number** Given an array nums containing (n + 1) elements and every element is between 1 to n. If there is only one duplicate element, find the duplicate number. Examples Input: nums = {1, 3, 4, 2, 2} Output: 2 Input: nums = {3, 1, 3, 4, 2} Output: 3 Naive ...

**Question 185. Reservoir Sampling** Reservoir Sampling is a technique of selecting k reservoir items randomly from a given list of n items, where n is very large. For example, search lists in Google, YouTube etc. Naive Approach for Reservoir Sampling Build a reservoir array of size k, randomly select items from the given list. ...

**Question 186. Most Frequent Element in an Array** You are given an array of integers. The problem statement says that you have to find out the most frequent element present in an array. If there are multiple values that occurs the maximum number of times, then we have to print any of them. Example Input [1, 4,5,3,1,4,16] Output ...

**Question 187. Minimum Path Sum** In the minimum path sum problem, we have given “a × b” matrix consisting of non-negative numbers. Your task is to find the path from top left to right bottom which minimizes the sum consisting of all the numbers which come in a path you found. Note: You can only move ...

**Question 188. How to Efficiently Implement k Stacks in a Single Array?** Design and implement a new data structure that Implement k Stacks in a Single Array. The new data structure must support these two operations – push (element, stack_number): that pushes the element in a given number of the stack. pop (stack_number): that pop out the top element from a given ...

**Question 189. Print Next Greater Number of Q queries** In Print Next Greater Number of Q queries problem we have given an array a[ ] of size n containing numbers and another array q[ ] of size m representing queries. Each query represents the index in array a[ ]. For each query, i print the number from the array ...

**Question 190. Check if an Array is Stack Sortable** In check if an array is stack sortable problem we have given an array a[ ] of size n containing elements from 1 to n in random order. Sort the array in ascending order using a temporary stack following only these two operations – Remove the element at the starting ...

**Question 191. Find Top K (or Most Frequent) Numbers in a Stream** In find top k (or most frequent) numbers in a stream problem, we have given an integer array consisting of some numbers. The problem statement says that you have to take an element from the array, and you can only have at most k numbers at the top. We need ...

**Question 192. K Empty Slots LeetCode** K Empty Slots is a very famous problem on LeetCode. The problem statement is like that- A garden is consists of n slots containing a flower each. All the flowers are unbloomed initially. Given an array a[ ] of flowers and an integer k. Considering i stating from 0, i+1’th ...

**Question 193. Trapping Rain Water LeetCode Solution** In the Trapping Rain Water LeetCode problem, we have given N non-negative integers representing an elevation map and the width of each bar is 1. We have to find the amount of water that can be trapped in the above structure. Example Let’s understand that by an example For the ...

**Question 194. Sliding Window Technique** Before getting on and along with what is the sliding window technique? What it does and how it does what it does let us get the hang of this concept by a small problem Given an array of integers, we have the task of finding the minimum sum from all ...

**Question 195. Finding K closest element** In Finding K closest element problem we have given a sorted array and a value x. The problem is to find the K number of elements closest to x in the given array. Given an array arr[] ={12, 16, 22, 30, 35, 39, 42,45, 48, 50, 53, 55, 56} and x ...

**Question 196. Jump Game** In jump game we have given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your maximum jump length at that position. Determine if you are able to reach the last index. Example Input: arr = [2,3,1,1,4] ...

**Question 197. Postfix to Prefix Conversion** In this problem, we have given a string that denotes the postfix expression. We have to do postfix to prefix conversion. Prefix Notation In this notation, we write the operands after the operator. It is also known as Polish Notation. For instance: +AB is a prefix expression. Postfix Notation In ...

**Question 198. Combination Sum** In combination sum problem we have given an array of positive integers arr[] and a sum s, find all unique combinations of elements in arr[] where the sum of those elements is equal to s. The same repeated number may be chosen from arr[] an unlimited number of times. Elements ...

**Question 199. Max Area of Island** Problem Description: Given a 2D matrix, the matrix has only 0(representing water) and 1(representing land) as entries. An island in the matrix is formed by grouping all the adjacent 1’s connected 4-directionally(horizontal and vertical). Find the maximum area of the island in the matrix. Assume that all four edges of ...

**Question 200. Search in Sorted Rotated Array** An element search in sorted rotated array can be found using binary search in O(logn) time. The objective of this post is to find a given element in a sorted rotated array in O(logn) time. Some example of a sorted rotated array is given. Example Input : arr[] = {7,8,9,10,1,2,3,5,6}; ...

**Question 201. Unique Paths** A m x n 2D grid is given and you are standing at the topmost and leftmost cell in the grid. i.e. the cell located at (1,1). Find the number of unique paths that can be taken to reach a cell located at (m,n) from the cell located at (1,1) ...

**Question 202. Maximum Subarray** In the Maximum Subarray problem we have given an integer array nums, find the contiguous sub array which has the largest sum and print the maximum sum subarray value. Example Input nums[] = {-2, 1, -3, 4, -1, 2, 1, -5, 4} Output 6 Algorithm The goal is to find ...

**Question 203. Length of Longest Fibonacci Subsequence** Given a strictly increasing array of positive integers, find the length of the longest fibonacci subsequence. A sequence of n elements is fibonacci like if, n >= 3 xi = x(i – 2) + x(i -1), where xi is the ith term of the sequence and i >= 2 Examples Input arr[] ...

**Question 204. Merging Intervals** In merging intervals problem we have given a set of intervals of the form [l, r], merge the overlapping intervals. Examples Input {[1, 3], [2, 6], [8, 10], [15, 18]} Output {[1, 6], [8, 10], [15, 18]} Input {[1, 4], [1, 5]} Output {[1, 5]} Naive Approach for merging intervals ...

**Question 205. 4Sum** In the 4Sum problem, we have given an integer x and an array a[ ] of size n. Find all the unique set of 4 elements in array such that sum of those 4 elements is equal to the given integer x. Example Input a[ ] = {1, 0, -1, ...

**Question 206. Find Peak Element** Let’s understand Find Peak Element problem. Today we have with us an array that needs its peak element. Now, you must be wondering as to what do I mean by the peak element? The peak element is one which is greater than all its neighbours. Example: Given an array of ...

**Question 207. K-th Smallest Element in a Sorted Matrix** In K-th Smallest Element in a Sorted Matrix problem, we have given an n x n matrix, where every row and column is sorted in non-decreasing order. Find the kth smallest element in the given 2D array. Example Input 1: k = 3 and matrix = 11, 21, 31, 41 ...

**Question 208. Pascal Triangle Leetcode** The Pascal Triangle is a very good Leetcode problem that is asked so many times in Amazon, Microsoft, and other companies. we have given non-negative integer rows, print first rows rows of the pascal triangle. Example rows = 5 rows = 6 Types of solution for Pascal Triangle Leetcode Dynamic Programming ...

**Question 209. Missing Number** In Missing Number problem we have given an array of size N containing a number from 0 to N. All the values in the array are unique. We need to find the missing number which is not present in the array and that number lies between 0 to N. Here ...

**Question 210. Merge Sorted Array** In merge sorted array problem we have given two sorted arrays in increasing order. In input first, we have given the number initialized to array1 and array2. These two-number are N and M. The size of array1 is equal to the sum of N and M. In array 1 first ...

**Question 211. Partition Equal Subset Sum** Partition Equal Subset Sum is a problem in which we have given an array of positive numbers. We have to find out that can we divide it into two subsets such that the sum of elements in both sets is the same. Here it’s not necessary that the number of ...

**Question 212. Sort Colors** Sort colors is a problem in which we have to given an array containing N objects. Each box is painted with a single color which can be red, blue, and white. We have N objects which are already painted. We have to sort the array such that the same color ...

**Question 213. Rotate Array** Rotate array is a problem in which we have given an array of size N. We have to rotate the array in the right direction. Each element shift by one position right and last element of the array come to the first position. So, we have given a value K ...

**Question 214. Container with Most Water** Problem description : you are given n integers (y0, y1, y2 … yn-1) at n indices (i = 0,1,2 … n-1). Integer at i-th index is yi. Now, you draw n lines on a cartesian plane each connecting points (i, yi) and (i, 0). Find the maximum volume of water ...

**Question 215. Matrix Chain Multiplication using Dynamic Programming** Matrix Chain Multiplication is a method in which we find out the best way to multiply the given matrices. We all know that matrix multiplication is associative(A*B = B*A) in nature. So, we have a lot of orders in which we want to perform the multiplication. Actually, in this algorithm, ...

**Question 216. Subarray Sum Equals k** Given an integer array and an integer k. Find total number of contiguous subarrays of given array whose sum of elements is equal to k. Example Input 1: arr[] = {5,0,5,10,3,2,-15,4} k = 5 Output: 7 Input 2: arr[] = {1,1,1,2,4,-2} k = 2 Output: 4 Explanation : consider example-1 ...

**Question 217. Subset sum problem** In the subset sum problem, we are given a list of all positive numbers and a Sum. We need to check if there is a subset whose sum is equal to the given sum. Example Input List of numbers: 1 2 3 10 5 sum: 9 Output true Explanation for ...

**Question 218. Heap Sort** Heap sort is a comparison based sorting technique that is based on a Binary Heap data structure. HeapSort is similar to a selection sort where we find the maximum element and then place that element at the end. We repeat this same process for the remaining elements. Given an unsorted ...

**Question 219. Coin Change Problem** Coin Change Problem – Given some coins of different values c1, c2, … , cs (For instance: 1,4,7….). We need an amount n. Use these given coins to form the amount n. You can use a coin as many times as required. Find the total number of ways in which ...

**Question 220. Multiplication of Two Matrices** Problem Statement In the “Multiplication of Two Matrices” problem we have given two matrices. We have to multiply these matrices and print the result or final matrix. Here, the necessary and sufficient condition is the number of columns in A should be equal to the number of rows in matrix ...

**Question 221. Minimum number of Merge Operations to make an Array Palindrome** Problem Statement In the “Minimum number of Merge Operations to make an Array Palindrome” problem we have given an array “a[]”. Find the minimum number of merge_operations are required to make an array palindrome. Note, A palindrome is a word, phrase, or sequence that reads the same backward as forwards. ...

**Question 222. Form Minimum Number from Given Sequence of D’s and I’s** Problem Statement In the “Form Minimum Number from Given Sequence of D’s and I’s” problem, we have given a pattern containing only I’s and D’s. I for increasing and D for decreasing. Write a program to print the minimum number following that pattern. Digits from 1-9 and digits can’t repeat. Input Format ...

**Question 223. Find the Subarray of given length with Least Average** Problem Statement In the “Find the Subarray of given length with Least Average” problem we have given an array and an input integer X. Write a program to find the subarray of length X with least/minimum average. Prints the starting and ending indexes of the subarray which has the least ...

**Question 224. Find Zeros to be Flipped so that Number of Consecutive 1’s is Maximized** Problem Statement In the “Find Zeros to be Flipped so that Number of Consecutive 1’s is Maximized” problem we have given a binary array and a number x which denotes the no. of zeros to be flipped. Write a program to find the zeros that need to be flipped so ...

**Question 225. Merge K Sorted Arrays and Print Sorted Output** Problem Statement In the “Merge K Sorted Arrays and Print Sorted Output” problem we have given k sorted arrays of different size. Write a program to merge those arrays and prints the final sorted array as output. Input Format The first line containing an integer n. Next n lines containing ...

**Question 226. Find the Minimum Element in a Sorted and Rotated Array** Problem Statement In the “Find the Minimum Element in a Sorted and Rotated Array” problem we have given a sorted array a[]. This array is rotated at some unknown point, find the minimum element in this array. Input Format The first and only one line containing an integer value n. ...

**Question 227. Sort Elements by Frequency II** Problem Statement In the “Sort Elements by Frequency II” problem we have given an array a[]. Sort the array according to the frequency of the elements where the higher frequency element comes first then others. Input Format The first and only one line containing an integer n. Second-line containing n ...

**Question 228. Stock Buy Sell to Maximize Profit** Problem Statement In the “Stock Buy Sell to Maximize Profit” problem we have given an array that contains stock price on each day, find the maximum profit that you can make by buying and selling in those days. Here, we can buy and sell multiple times but only after selling ...

**Question 229. Merge Overlapping Intervals II** Problem Statement In the “Merge Overlapping Intervals II” problem we have given a set of intervals. Write a program that will merge the overlapping intervals into one and print all the non-overlapping intervals. Input Format The first line containing an integer n. Second-line containing n pairs where each pair is ...

**Question 230. Maximum Subarray Sum using Divide and Conquer** Problem Statement In the “Maximum Subarray Sum using Divide and Conquer” problem we have given an array of both positive and negative integers. Write a program that will find the largest sum of the contiguous subarray. Input Format The first line containing an integer N. Second-line containing an array of ...

**Question 231. Pancake Sorting Problem** Problem Statement “Pancake Sorting Problem” is based on pancake sorting. Given an unsorted array, we need to write a program that uses only flip operation to sort the array. Flip is the operation that reverses the array. Input Format The first line containing an integer N. Second-line containing N space-separated ...

**Question 232. Pancake Sorting** Problem Statement In the “Pancake Sorting” problem we have given an array of integers A[]. Sort the array by performing a series of pancake flips. In one pancake flip we do the following steps: Choose an integer k where 1 <= k <= arr.length. Reverse the sub-array arr[0…k-1] (0-indexed). Input ...

**Question 233. Arrange given Numbers to Form the Biggest Number II** Problem Statement In the “Arrange given Numbers to Form the Biggest Number II” problem, we have given an array of positive integers. Arrange them in such a way that the arrangement will form the largest value. Input Format The first and only one line containing an integer n. Second-line containing ...

**Question 234. Iterative Implementation of Quick Sort** Problem Statement In the “Iterative Implementation of Quick Sort” problem, we have given an array a[]. We have to sort the array using quick sort. Here, quick sort is not implemented recursively, it is implemented in an iterative manner. Input Format The first line containing an integer n. Second-line containing ...

**Question 235. Shuffle a given Array** Problem Statement In the “Shuffle a given Array” problem we have given an array of integers. Write a program that shuffles the given array. That is, it will shuffle the elements in the array randomly. Input Format The first line containing an integer n. Second-line containing n space-separated integer Output ...

**Question 236. Find the Row with Maximum Number of 1’s** Problem Statement In the “Find the Row with Maximum Number of 1’s” problem we have given a matrix(2D array) containing binary digits with each row sorted. Find the row which has the maximum number of 1’s. Input Format The first line containing two integers values n, m. Next, n lines ...

**Question 237. Sorting a K Sorted Array** Problem Statement In the “Sorting a K Sorted Array” problem we have given an array of n elements, where each element is at most k away from its target position. Devise an algorithm that sorts in O(n log k) time. Input Format The first line containing two integer values N ...

**Question 238. Maximum Product Subarray II** Problem Statement In the “Maximum Product Subarray II” problem we have given an array consisting of positive, negative integers, and also zeroes. We need to find the maximum product of the subarray. Input Format The first line containing an integer N. Second-line containing N space-separated integers. Output Format The only ...

**Question 239. Largest Subarray with Equal Number of 0’s and 1’s** Problem Statement In the “Largest Subarray with Equal Number of 0’s and 1’s” problem, we have given an array a[] containing only 0 and 1. Find the largest subarray with an equal number of 0’s and 1’s and will print the start index and end index of the largest subarray. ...

**Question 240. Maximum Sum Increasing Subsequence** Problem Statement In the “Maximum Sum Increasing Subsequence” problem we have given an array. Find the sum of the maximum subsequence of the given array, that is the integers in the subsequence are in sorted order. A subsequence is a part of an array which is a sequence that is ...

**Question 241. Number of Smaller Elements on Right Side** Problem Statement In the “Number of Smaller Elements on Right Side” problem, we have given an array a[]. Find the number of smaller elements that are on the right_side of each element. Input Format The first and only one line containing an integer N. Second-line containing N space-separated integers. Output ...

**Question 242. Increasing Subsequence of Length three with Maximum Product** Problem Statement In the “Increasing Subsequence of Length three with Maximum Product” problem, we have given an array of positive integers. Find the subsequence of length 3 with the maximum product. Subsequence should be increasing. Input Format The first and only one line containing an integer N denoting the size ...

**Question 243. Elements Appear more than N/K times in Array** Problem Statement In the “Elements Appear more than N/K times in Array” problem we have given an integer array of size n. Find the elements which appear more than n/k times. Where k is the input value. Input Format The first and only one line containing two integers N and ...

**Question 244. Find the Peak Element from an Array** Problem Statement In the “Find the Peak Element from an Array” problem we have given an input array of integers. Find a peak element. In an array, an element is a peak element, if the element is greater than both the neighbours. For corner elements, we can consider the only ...

**Question 245. Rearrange Positive and Negative Numbers Alternatively in Array** Problem Statement In the “Rearrange Positive and Negative Numbers Alternatively in Array” problem we have given an array a[]. This array contains positive and negative integers. Rearrange the array in such a way that positive and negative are placed alternatively. Here, the number of positive and negative elements need not ...

**Question 246. Find the Maximum Repeating Number in Array** Problem Statement In the “Find the Maximum Repeating Number in Array” problem we have given an unsorted array of size N. Given array contains numbers in range {0, k} where k <= N. Find the number that is coming the maximum number of times in the array. Input Format The ...

**Question 247. Tug of War** Problem Statement In tug of war problem, we have given an array of integers, divide the array into two subsets of size n/2 size each so that the difference of the sum of two subsets is as minimum as possible. If n is even each subset size is n/2. If ...

**Question 248. First Circular Tour to Visit all the Petrol Bunks** In the first circular tour to visit all the petrol bunks problem the statement is such that there is a circle with n petrol pumps on the circle. Every petrol pump has a pair of data. The first value is the amount of petrol pump has and the second is ...

**Question 249. Count Possible Triangles** Problem Statement In count possible triangles problem we have given an array of n positive integers. Find the number of triangles that can be formed using three different elements of the array as the sides of a triangle. Note: The condition of the triangle is the sum of two sides ...

**Question 250. Maximum Circular Subarray Sum** Problem Statement In the maximum circular subarray sum problem, we have given an array of integers arranged in a circle, find the maximum sum of consecutive numbers in the circular array. Example Input arr[] = {13, -17, 11, 9, -4, 12, -1} Output 40 Explanation Here, sum = 11 + ...

**Question 251. Four Elements that Sum to Given** Problem Statement In four elements that sum to a given problem, we have given an array containing N elements that may be positive or negative. Find the set of four elements whose sum is equal to given value k. Input Format First-line containing an integer N. Second-line containing an array ...

**Question 252. Partition Problem** Problem Statement In the Partition problem, we have given a set that contains n elements. Find whether the given set can be divided into two sets whose sum of elements in the subsets is equal. Example Input arr[] = {4, 5, 11, 9, 8, 3} Output Yes Explanation The array ...

**Question 253. The Celebrity Problem** Problem Statement In the celebrity problem there is a room of N people, Find the celebrity. Conditions for Celebrity is- If A is Celebrity then Everyone else in the room should know A. A shouldn’t know anyone in the room. We need to find the person who satisfies these conditions. ...

**Question 254. Find a Sorted Subsequence of size 3** Problem Statement In the given unsorted array of integers. We need to find a sorted subsequence of size 3. Let three elements be array[i], array[j], array[k] then, array[i] < array[j] < array[k] for i< j < k. If there are multiple triplets found in the array then print any one ...

**Question 255. Subarray with Given Sum** Problem Statement In the subarray with the given sum problem, we have given an array containing n positive elements. We have to find the subarray in which the sum of all the elements of the subarray equal to a given_sum. Subarray is obtained from the original array by deleting some ...

**Question 256. Maximum Element in an Array which is Increasing and then Decreasing** Problem Statement In the given array which contains n elements. Elements are stored in such a way that first k elements are in increasing order and then n-k elements in decreasing from there, we need to find the maximum element in the array. Example a) Input array : [15, 25, ...

**Question 257. Count Minimum Steps to Get the given Array** Problem Statement In count minimum steps to get the given array problem, we have given an input array target[] containing n elements, we need to compute the minimum number of operations from converting array[] of size n with all zeros to target[]. Operations a) Increment an element by 1 is ...

**Question 258. Find the Lost Element From a Duplicated Array** Problem Statement Given two arrays A and B, one array is a duplicate of the other except one element. The one element is missing from either A or B. we need to find the lost element from a duplicated array. Example 5 1 6 4 8 9 6 4 8 ...

**Question 259. Rearrange given Array in Maximum Minimum Form** Problem Statement In the “Rearrange given Array in Maximum Minimum Form” problem, we have given a sorted array containing N elements. Rearrange the given sorted array of positive integers, such that alternative elements are ith max and ith min. See below for a better understanding of rearrangement of elements- Array[0] ...

**Question 260. Subarray and Subsequence** Problem Statement In the subarray and subsequence problem, we have to print all the subarrays and subsequences for a given array. Generate all possible non-empty subarrays. A subarray is commonly defined as a part or section of an array in which the contiguousness is based on the index. The subarray ...

**Question 261. Merge Two Sorted Arrays** Problem Statement In merge two sorted arrays problem, we have given two input sorted arrays, we need to merge these two arrays such that the initial numbers after complete sorting should be in the first array and remaining in the second array. Example Input A[] = {1, 3, 5, 7, ...

**Question 262. Count of Triplets With Sum Less than Given Value** Problem Statement We have given an array containing N number of elements. In the given array, Count the number of triplets with a sum less than the given value. Example Input a[] = {1, 2, 3, 4, 5, 6, 7, 8} Sum = 10 Output 7 Possible triplets are : ...

**Question 263. Next Greater Element in an Array** Problem Statement Given an array, we will find the next greater element of each element in the array. If there is no next greater element for that element then we will print -1, else we will print that element. Note: Next greater element is the element that is greater and ...

**Question 264. Merging Two Sorted Arrays** Problem Statement In merging two sorted arrays problem we have given two sorted arrays, one array with size m+n and the other array with size n. We will merge the n sized array into m+n sized array and print the m+n sized merged array. Example Input 6 3 M[] = ...

**Question 265. Find a Fixed Point in a Given Array** Problem Statement Given an array of n distinct elements, find a fixed point in a given array, where a fixed point means the element value is the same as the index. Example Input 5 arr[] = {0,4,8,2,9} Output 0 is a fixed point in this array because value and index ...

**Question 266. Find Element Using Binary Search in Sorted Array** Problem Statement Given a sorted array, Find element using binary search in the sorted array. If present, print the index of that element else print -1. Example Input arr[] = {1, 6, 7, 8, 9, 12, 14, 16, 26, 29, 36, 37, 156} X = 6 //element to be searched ...

**Question 267. Find Triplet in Array With a Given Sum** Problem Statement Given an array of integers, find the combination of three elements in the array whose sum is equal to a given value X. Here we will print the first combination that we get. If there is no such combination then print -1. Example Input N=5, X=15 arr[] = ...

**Question 268. Find Duplicates in an Array in Most Efficient Way** Problem Statement Display all the elements which are duplicates in the most efficient way in O(n) and O(1) space. Given an array of size n which contains numbers from range 0 to n-1, these numbers can occur any number of times. Find duplicates in an array in the most efficient ...

**Question 269. Sort 0s 1s and 2s in an Array** Problem Statement Given an array containing N elements where elements of the array are 0,1 or 2. Sort or Segregate 0s 1s and 2s in an array. Arrange all zeros in the first half, all ones in the second half and all twos in the third half. Example Input 22 ...

**Question 270. Find Leaders in an Array** Problem Statement Given an array containing N elements. Find the leaders in an array. Leaders are the element that have no element larger than themselves on the right of them in the array. Example Input 7 1 95 4 46 8 12 21 Output 95 46 21 Explanation Here no ...

**Question 271. Smallest Positive Number Missing in an Unsorted Array** Problem Statement In the given unsorted array find the smallest positive number missing in an unsorted array. A positive integer doesn’t include 0. We can modify the original array if needed. The array may contain positive and negative numbers. Example a. Input array : [3, 4, -1, 0, -2, 2, 1, ...

**Question 272. Find K Length Subarray of Maximum Average** Problem Statement In find K length subarray of maximum average problem, we have given an array of size N. Finding the start position of a subarray in the given array of size k with a maximum average. The array may contain positive and negative numbers. (Average = sum of elements/number ...

**Question 273. Find Pythagorean Triplets from Array** Problem Statement We have given an array that contains n integers. We need to find the set of Pythagorean triples from the given array. Note: Pythagorean triplets condition: a^2 + b^2 = c^2. Example Input 6 [3, 4, 6, 5, 7, 8] Output Pythagorean triplets: 3, 4, 5 Approach 1 ...

**Question 274. Move All the Zeros to the End of the Given Array** Problem Statement In the given array move all the zeros which are present in the array to the end of the array. Here there is always a way exist to insert all the number of zeroes to the end of the array. Example Input 9 9 17 0 14 0 ...

**Question 275. Find Minimum Distance Between Two Numbers in an Array** Problem Statement In the given unsorted array, which may also contain duplicates, find the minimum distance between two different numbers in an array. Distance between 2 numbers in an array: the absolute difference between the indices +1. Example Input 12 3 5 4 2 6 5 6 6 5 4 ...

**Question 276. Count Number of Occurrences in a Sorted Array** Problem Statement In the “Count Number of Occurrences in a Sorted Array” problem, we have given a sorted array. Count the number of occurrences or frequency in a sorted array of X where X is an integer. Example Input 13 1 2 2 2 2 3 3 3 4 4 ...

**Question 277. Maximum Sum of Non Consecutive Elements** Problem Statement In the “Maximum Sum of Non Consecutive Elements” given array, you need to find the maximum sum of non-consecutive elements. You can not add immediate neighbor numbers. For example [1,3,5,6,7,8,] here 1, 3 are adjacent so we can’t add them, and 6, 8 are not adjacent so we ...

**Question 278. Find Smallest Missing Number in a Sorted Array** Problem Statement In the “Find Smallest Missing Number in a Sorted Array” problem we have given an integer array. Find the smallest missing number in N sized sorted array having unique elements in the range of 0 to M-1, where M>N. Example Input [0, 1, 2, 3, 4, 6, 7, ...

**Question 279. First Repeating Element** Problem Statement We have given an array that contains n integers. We have to find the first repeating element in the given array. If there is no repeated element then print “No repeating integer found”. Note: Repeating elements are those elements that come more than once. (Array may contain duplicates) ...

**Question 280. A Product Array Puzzle** Problem Statement In a product array puzzle problem we need to construct an array where the ith element will be the product of all the elements in the given array except element at the ith position. Example Input 5 10 3 5 6 2 Output 180 600 360 300 900 ...

**Question 281. Find All Pairs With a Given Difference** Problem Statement We have given an array of containing different elements or no repeated elements present in the array. Find all pairs with a given difference. If there is no any pair with given different then print “No pair with given different”. Example Input 10 20 90 70 20 80 ...

**Question 282. Find the first Repeating Number in a Given Array** Problem Statement There can be multiple repeating numbers in an array but you have to find the first repeating number in a given array (occurring the second time). Example Input 12 5 4 2 8 9 7 12 5 6 12 4 7 Output 5 is the first repeating element ...

**Question 283. Maximum difference between two elements such as larger element comes after smaller** Problem Statement We have given an array of n integers in which we have to find the maximum difference between two elements such as larger element comes after smaller. Example Input 4 7 2 18 3 6 8 11 21 Output 19 Approach 1 for Maximum difference between two elements ...

**Question 284. Majority Element** Problem Statement Given a sorted array, we need to find the majority element from the sorted array. Majority element: Number occurring more than half the size of the array. Here we have given a number x we have to check it is the majority_element or not. Example Input 5 2 ...

**Question 285. Find the First and Second Smallest Elements** Problem Statement In find the first and second smallest elements problem we have given an array of integers. Find the first and second smallest integers from an array or find two smallest numbers from an array. Example Input 7, 6, 8, 10, 11, 5, 13, 99 Output First Smallest is ...

**Question 286. Find the Number Occurring Odd Number of Times in an Array** Problem Statement Given an array of positive integers. All numbers occur even a number of times except one number which occurs an odd number of times. We have to find the number occurring an odd number of times in an array. Example Input 1, 1, 1, 1, 2, 2, 3, ...

**Question 287. Sort Elements by Frequency of Occurrences** Problem Statement In sort elements by frequency of occurrences problem, we have given an array a[]. Sort array elements in such a way that the element with the highest number of occurrences comes first. If the number of occurrences is equal then the print the number which appeared first in ...

**Question 288. Find the Missing Number** Problem Statement In finding the missing number from an array of 1 to N numbers we have given an array that contains N-1 numbers. One number is missing from an array of numbers from 1 to N. We have to find the missing number. Input Format First-line containing an integer ...

## Amazon String Questions

**Question 289. Longest Common Prefix Leetcode Solution** Problem Statement The Longest Common Prefix LeetCode Solution – “Longest Common Prefix” states that given an array of strings. We need to find the longest common prefix among these strings. If there doesn’t exist any prefix, return an empty string. Example: Input: strs = ["flower","flow","flight"] Output: "fl" Explanation: “fl” is the longest ...

**Question 290. Valid Palindrome II Leetcode Solution** Problem Statement The Valid Palindrome II LeetCode Solution – “Valid Palindrome II” states that given the string s, we need to return true if s can be a palindrome string after deleting at most one character. Example: Input: s = "aba" Output: true Explanation: The input string is already palindrome, so there’s ...

**Question 291. Valid Parentheses Leetcode Solution** Problem Statement The Valid Parentheses LeetCode Solution – “Valid Parentheses” states that you’re given a string containing just the characters '(', ')', '{', '}', '[' and ']'. We need to determine whether the input string is a valid string or not. A string is said to be a valid string if open brackets must be closed ...

**Question 292. Largest Number Leetcode Solution** Problem Statement The Largest Number LeetCode Solution – “Largest Number” states that given a list of non-negative integers nums, we need to arrange the numbers in such a way that they form the largest number and return it. Since the result may be very large, so you need to return ...

**Question 293. Implement Trie (Prefix Tree) Leetcode Solution** Problem Statement The Implement Trie (Prefix Tree) LeetCode Solution – “Implement Trie (Prefix Tree)” asks you to implement the Trie Data Structure that performs inserting, searching and prefix searching efficiently. Example: Input: ["Trie", "insert", "search", "search", "startsWith", "insert", "search"] [[], ["apple"], ["apple"], ["app"], ["app"], ["app"], ["app"]] Output: [null, null, true, false, true, null, true] Explanation: After inserting all the strings, trie looks like this. Word apple is searched which ...

**Question 294. Palindrome Partitioning Leetcode Solution** Problem Statement The Palindrome Partitioning LeetCode Solution – “Palindrome Partitioning” states that you’re given a string, partition the input string such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of the input string. Example: Input: s = "aab" Output: [["a","a","b"],["aa","b"]] Explanation: There exist exactly 2 valid ...

**Question 295. Count and Say Leetcode Solution** Problem Statement The Count and Say LeetCode Solution – “Count and Say” asks you to find the nth term of the count-and-say sequence. The count-and-say sequence is a sequence of digit strings defined by the recursive formula: countAndSay(1) = "1" countAndSay(n) is the way you would “say” the digit string from countAndSay(n-1), which is then converted ...

**Question 296. Palindromic Substrings Leetcode Solution** Problem Statement The Palindromic Substrings LeetCode Solution – “Palindromic Substrings” asks you to find a total number of palindromic substrings in the input string. A string is a palindrome when it reads the same backward as forward. A substring is a contiguous sequence of characters within the string. Example: Input: s = "aaa" Output: ...

**Question 297. Maximum Length of a Concatenated String with Unique Characters Leetcode Solution** Problem Statement The Maximum Length of a Concatenated String with Unique Characters LeetCode Solution – “Maximum Length of a Concatenated String with Unique Characters” says that you’re given an array of strings and you need to choose any subsequence of the given array and concatenate those strings to form the ...

**Question 298. Shortest Word Distance Leetcode Solution** Problem Statement The Shortest Word Distance LeetCode Solution – says that you’re given an array of strings and two different words. We need to return the shortest distance between these two words that appear in the input string. Example: Input: wordsDict = ["practice", "makes", "perfect", "coding", "makes"], word1 = "coding", word2 = "practice" Output: 3 Explanation: Word “coding” occurs at position 4. ...

**Question 299. Remove Invalid Parentheses Leetcode Solution** Problem Statement The Remove Invalid Parentheses Leetcode Solution – states that you’re given a string s that contains parenthesis and lowercase letters. We need to remove the minimum number of invalid parentheses to make the input string valid. We need to return all possible results in any order. A string is ...

**Question 300. Minimum Number of Steps to Make Two Strings Anagram Leetcode Solutions** Problem Statement In this problem, we are given two strings ‘s’ & ‘t’ consisting of lower-case English characters. In one operation, we can choose any character in string ‘t’ and change it to some other character. We need to find the minimum number of such operations to make ‘t’ an ...

**Question 301. Isomorphic Strings Leetcode Solution** Problem Statement In this problem, we are given two strings, a and b. Our goal is to tell whether the two strings are isomorphic or not. Two strings are called isomorphic if and only if the characters in the first string can be replaced by any character(including itself) at all ...

**Question 302. Minimum Swaps to Make Strings Equal Leetcode Solution** Problem Statement You are given two strings s1 and s2 of equal length consisting of letters “x” and “y” only. you can swap any two characters belong to different strings, your task is to make both the string equal. return minimum number of swaps required to make both strings equal ...

**Question 303. Remove Palindromic Subsequences Leetcode Solution** The problem Remove Palindromic Subsequences Leetcode Solution states that you are given a string. The string consists of only two characters ‘a’ or ‘b’. You are required to erase the whole string. There is a restriction that you can delete only a palindromic subsequence in one move. Find the minimum ...

**Question 304. Defanging an IP Address Leetcode Solution** Problem Statement In this problem, we are given an IP Address. We just have to convert it into a Defanged IP Address i.e. in our output string, all the “.” are converted to “[.]”. Example #1: address = "1.1.1.1" "1[.]1[.]1[.]1" #2: address = "255.100.50.0" "255[.]100[.]50[.]0" Approach 1 (Using String Stream/Builder) ...

**Question 305. String Matching in an Array Leetcode Solution** The problem String Matching in an Array Leetcode Solution provides us with an array of strings. The problem asks us to find the strings that are substrings of some other string from the input. Just a quick reminder, a substring is nothing but a part of the string remaining after ...

**Question 306. Is Subsequence Leetcode Solution** Problem Statement In this problem, we are given two different strings. The goal is to find out whether the first string is a subsequence of the second. Examples first string = "abc" second string = "mnagbcd" true first string = "burger" second string = "dominos" false Approach(Recursive) This is easy ...

**Question 307. Find the Difference Leetcode Solution** In this problem, we are given two strings. The second string is generated by shuffling the characters of the first string randomly and then adding an extra character at any random position. We need to return the extra character that was added to the second string. The characters will always ...

**Question 308. Add Binary Leetcode Solution** Problem Statement Given two binary strings a and b, we have to add these two strings and then return the result as a binary string. Binary string are the strings that contains only 0s and 1s. Example a = "11", b = "1" "100" a = "1010", b = "1011" "10101" Approach For adding two ...

**Question 309. Valid Palindrome Leetcode Solution** Problem Statement Given a string, we have to determine if it is a palindrome, considering only alphanumeric characters i.e. numbers and alphabets only. We also have to ignore cases for alphabet characters. Example "A man, a plan, a canal: Panama" true Explanation: “AmanaplanacanalPanama” is a valid palindrome. "race a car" ...

**Question 310. Reverse Vowels of a String Leetcode Solution** Problem Statement In this problem a string is given and we have to reverse only the vowels of this string. Example "hello" "holle" Explanation: before reversing : “hello” after reversing : “holle” "leetcode" "leotcede" Explanation: Approach 1 (Using Stack) We just have to reverse the vowels present in input ...

**Question 311. Roman to Integer Leetcode Solution** In the problem “Roman to Integer”, we are given a string representing some positive integer in its Roman numeral form. Roman numerals are represented by 7 characters that can be converted to integers using the following table: Note: The integer value of the given roman numeral will not exceed or ...

**Question 312. Path Crossing Leetcode Solution** Problem Statement In path crossing problem a_string is given in which there are only four different characters ‘N’, ‘S’, ‘E’ or ‘W’ showing the movement of an object in one direction at a time by 1 unit. Object is initially at origin (0,0). We have to find out if the ...

**Question 313. Multiply Strings Leetcode Solution** The problem Multiply Strings Leetcode solution asks us to multiply two strings which are given to us as input. We are required to print or return this result of multiplying to the caller function. So to put it more formally given two strings, find the product of the given strings. ...

**Question 314. Integer to Roman Leetcode Solution** In this problem, we are given an integer and are required to convert into roman numeral. Thus the problem is generally referred to as “Integer to Roman” and this is Integer to Roman Leetcode Solution. If someone does not know about Roman numerals. In the old times, people did not ...

**Question 315. Scramble String** Problem Statement “Scramble String” problem states that you are given two strings. Check if the second string is a scrambled string of first one or not? Explanation Let string s = “great” Representation of s as binary tree by recursively dividing it into two non-empty sub-strings. This string can be ...

**Question 316. Group Anagrams** We have to find out the group anagrams of the given words. This means for each word we are going to sort it and store it as a key and original input which is not sorted as a value and if any other input has the same value as a ...

**Question 317. Integer to English words** In problem “Integer to English words” we have given a non-negative integer and the tasks to convert that integer into its numerical words or we get an input of a number, any number, and our task is to represent that number in a string form. Let’s see one example, the ...

**Question 318. Find Smallest Range Containing Elements from k Lists** In the problem “Find the smallest range containing elements from k lists” we have given K lists which are sorted and of the same size N. It asks to determine the smallest range that contains at least element(s) from each of the K lists. If there is more than one ...

**Question 319. Minimum insertions to form a palindrome with permutations allowed** The problem “Minimum insertions to form a palindrome with permutations allowed” states that you are given a String with all letters in lowercase. The problem statement asks to find out the minimum insertion of a character to a string that it can become Palindrome. The position of characters can be ...

**Question 320. LCS (Longest Common Subsequence) of three strings** The problem “LCS (Longest Common Subsequence) of three strings” states that you are given 3 strings. Find out the longest common subsequence of these 3 strings. LCS is the string that is common among the 3 strings and is made of characters having the same order in all of the ...

**Question 321. Check if Array Contains Contiguous Integers With Duplicates Allowed** You are given an array of integers which can contain duplicate elements as well. The problem statement asks to find out if it is a set of contiguous integers, print “Yes” if it is, print “No” if it is not. Example Sample Input: [2, 3, 4, 1, 7, 9] Sample ...

**Question 322. Longest Repeated Subsequence** The problem “Longest Repeated Subsequence” states that you are given a string as an input. Find out the longest repeated subsequence, that is the subsequence that exists twice in the string. Example aeafbdfdg 3 (afd) Approach The problem asks us to find out the longest repeated subsequence in the string. ...

**Question 323. Check for Palindrome after every character replacement Query** The problem “Check for Palindrome after every character replacement Query” states that suppose you are given a String and no. of Queries, each query has two integer input values as i1 and i2 and one character input called ‘ch’. The problem statement asks to change the values at i1 and ...

**Question 324. Letter Combinations of a Phone Number** In letter combinations of a phone number problem, we have given a string containing numbers from 2 to 9. The problem is to find all the possible combinations that could be represented by that number if every number has some letters assigned to it. The assignment of the number is ...

**Question 325. Longest Substring Without Repeating Characters LeetCode Solution** Longest Substring Without Repeating Characters LeetCode Solution – Given a string, we have to find the length of the longest substring without repeating characters. Let’s look into a few examples: Example pwwkew 3 Explanation: Answer is “wke” with length 3 aav 2 Explanation: Answer is “av” with length 2 Approach-1 ...

**Question 326. Form minimum number from given sequence** The problem “Form minimum number from given sequence” states that you are given some pattern of I’s and D’s only. The meaning of I stands for increasing and for decreasing we are provided with D. The problem statement asks to print the minimum number which satisfies the given pattern. We have ...

**Question 327. Find Index of Closing Bracket for a Given Opening Bracket in an Expression** Problem Statement Given a string s of length/size n and an integer value representing the index of an opening square bracket. Find index of closing bracket for a given opening bracket in an expression. Example s = "[ABC[23]][89]" index = 0 8 s = "[C-[D]]" index = 3 5 s ...

**Question 328. Text Justification LeetCode Solution** We will discuss Text Justification LeetCode Solution today Problem Statement The problem “Text Justification” states that you are given a list s[ ] of type string of size n and an integer size. Justify the text such that each line of text consists of size number of characters. You can ...

**Question 329. Reverse individual words** Problem Statement The problem “Reverse individual words” states that you are given a string s. Now, print the reverse of all the individual words in the string. Example s = "TutorialCup - changing the way of learning" puClairotuT - gnignahc eht yaw fo gninrael s = "Reverse individual words" esreveR ...

**Question 330. Remove brackets from an algebraic string containing + and – operators** Problem Statement You are given a string s of size n representing an arithmetic expression with parenthesis. The problem “Remove brackets from an algebraic string containing + and – operators” asks us to create a function that can simplify the given expression. Example s = "a-(b+c)" a-b-c s = a-(b-c-(d+e))-f a-b+c+d+e-f ...

**Question 331. Minimum sum of squares of character counts in a given string after removing k characters** Problem Statement The problem “Minimum sum of squares of character counts in a given string after removing k characters” states that you are given a string containing lower case characters only. You are allowed to remove k characters from the string such that in the remaining string the sum of ...

**Question 332. Queue based approach for first non-repeating character in a stream** Problem Statement The problem “Queue based approach for first non-repeating character in a stream” states that you are given a stream containing lower case characters, find the first non-repeating character whenever a new character is added to the stream, and if there is no non-repeating character return -1. Examples aabcddbe ...

**Question 333. Form Minimum Number From Given Sequence** Problem Statement The problem “Form Minimum Number From Given Sequence states that you are given a string s of length/size n representing a pattern of characters ‘I’ i.e. increasing and ‘D’ i.e. decreasing only. Print the minimum number for the given pattern with unique digits from 1-9. For instance – ...

**Question 334. Palindrome Substring Queries** Problem Statement The problem “Palindrome Substring Queries” states that you are given a String and some queries. With those queries, you have to determine if the formed substring from that query is a palindrome or not. Example String str = "aaabbabbaaa" Queries q[] = { {2, 3}, {2, 8},{5, 7}, ...

**Question 335. Arrange given numbers to form the biggest number** Problem Statement Suppose you have an array of integers. The problem “Arrange given numbers to form the biggest number” asks to rearrange the array in such a manner that the output should be the maximum value which can be made with those numbers of an array. Example [34, 86, 87, ...

**Question 336. Palindrome Partitioning** Problem Statement Given a string, find the minimum number of cuts required such that all the substrings of partitions are palindromes. Since we are cutting our original string into different partitions such that all the substrings are palindromes, we call this problem the Palindrome Partition Problem. Example asaaaassss 2 Explanation: ...

**Question 337. Reverse words in a string** Problem Statement “Reverse words in a string” states that you are given a string s of size n. Print the string in reverse order such that the last word becomes the first, second last becomes the second, and so on. Hereby string we refer to a sentence containing words instead ...

**Question 338. Maximum weight transformation of a given string** Problem Statement The maximum weight transformation of a given string problem states that given a string consisting only of two characters ‘A’ and ‘B’. We have an operation where we can transform string to another string by toggling any character. Thus many transformations are possible. Out of all the possible ...

**Question 339. Mobile Numeric Keypad Problem** Problem Statement In the mobile numeric keypad problem, we consider a numeric keypad. We need to find all number of possible numeric sequences of given length such that you are only allowed to press buttons which are top, down, left, and right of the current button. You are not allowed ...

**Question 340. Shortest Palindrome** In the shortest palindrome problem, we have given a string s of length l. Add characters in front of it to make it palindrome if it’s not. Print the smallest count of characters used to make the given string a palindrome. Example Input : s = abc Output: 2 (by ...

**Question 341. Second Most Repeated Word in a Sequence** Given a sequence of strings, the task is to find out the second most repeated (or frequent) word or string in a sequence. (Considering no two words are the second most repeated, there will be always a single word). Example Input: {“aaa”, ”bb”, ”bb”, ”aaa”, ”aaa”, c”} Output: String with ...

**Question 342. Maximum occurring character in a string** Given a string of size n containing lower case letters. We need to find the maximum occurring character in a string. If there is more than one character with a maximum occurrence then print any of them. Example Input: String s=”test” Output: Maximum occurring character is ‘t’. Approach 1: Using ...

**Question 343. Decode Ways** In Decode Ways problem we have given a non-empty string containing only digits, determine the total number of ways to decode it using the following mapping: 'A' -> 1 'B' -> 2 ... 'Z' -> 26 Example S = “123” Number of ways to decode this string is 3 If we ...

**Question 344. Edit Distance** In the edit distance problem we have to find the minimum number of operations required to convert a string X of length n to another string Y of length m. Operations allowed: Insertion Deletion Substitution Example Input: String1 = “abcd” String2 = “abe” Output: Minimum operations required is 2 ( ...

**Question 345. Substring With Concatenation Of All Words** In substring with the concatenation of all words problem, we have given a string s and a list consist of many words each of the same length. Print the starting index of the substring which can be the result of the concatenation of all the words in the list in ...

**Question 346. Minimum Bracket Reversals** In minimum bracket reversals problem, we have given a string s containing an expression of characters ‘{‘ and ‘}’ only. Find the minimum number of bracket reversals needed to make an expression balanced. Example Input : s = “}{” Output: 2 Input : s = “{{{” Output: The given expression can not ...

**Question 347. Expression Contains Redundant Bracket or Not** Given a string s containing an expression of operators, operands, and parenthesis. Find if the given string contains any unnecessary parenthesis without which the expression will still give the same result. In other words, we have to find that expression contains a redundant bracket or not. Redundant Bracket If an ...

**Question 348. Check if Two Expressions With Brackets are Same** Given two strings s1 and s2 representing expressions containing addition operator, subtraction operator, lowercase alphabets, and parenthesis. Check if two expressions with brackets are the same. Example Input s1 = “-(a+b+c)” s2 = “-a-b-c” Output Yes Input s1 = “a-b-(c-d)” s2 = “a-b-c-d” Output No Algorithm to Check if Two ...

**Question 349. Valid Parenthesis String** In the valid parenthesis string problem we have given a string containing ‘(‘, ‘)‘ and ‘*‘, check if the string is balanced if ‘*‘ can be replaced with ‘(‘, ‘)‘ or an empty string. Examples Input “()” Output true Input “*)” Output true Input “(*))” Output true Naive Approach for ...

**Question 350. Longest Palindromic Subsequence** In the longest palindromic subsequence problem we have given a string, find the length of the longest palindromic subsequence. Examples Input: TUTORIALCUP Output: 3 Input: DYNAMICPROGRAMMING Output: 7 Naive Approach for Longest Palindromic Subsequence The naive approach to solve the above problem is to generate all the subsequences of the ...

**Question 351. KMP Algorithm** KMP(Knuth-Morris-Pratt) algorithm is used for pattern searching in a given string. We are given a string S and a pattern p, our goal is to determine whether or not the given pattern is present in the string. Example Input: S = “aaaab” p = “aab” Output: true Naive Approach The ...

**Question 352. Check for Balanced Parentheses in an Expression** Given a string s of length n. Check whether there is a closing parenthesis for every opening parentheses i.e. if all the parentheses are balanced. In other words, we can also say that, if we have a ‘}’, ‘)’ and ‘]’ for every ‘{‘, ‘(‘ and ‘[‘ respectively, the expression ...

**Question 353. Find if an Expression has Duplicate Parenthesis or Not** Given a string containing balanced parenthesis. Find if the expression/string contains duplicate parenthesis or not. Duplicate Parenthesis When an expression is in the middle of or surrounded by the same type of balanced parenthesis i.e. enclosed between the same type of opening and closing parenthesis more than once it is ...

**Question 354. Find Maximum Depth of Nested Parenthesis in a String** Given a string s. Write the code to print the maximum depth of nested parenthesis in the given string. Example Input : s = “( a(b) (c) (d(e(f)g)h) I (j(k)l)m)” Output : 4 Input : s = “( p((q)) ((s)t) )” Output : 3 Using Stack Algorithm Initialize a string s of length ...

**Question 355. Balanced Expression with Replacement** In Balanced Expression with Replacement problem we have given a string s containing parenthesis i.e. ‘(‘, ‘)’, ‘[‘, ‘]’, ‘{‘, ‘}’. The string also contains x at some places as a replacement of parenthesis. Check if the string can be converted into an expression with valid parenthesis after replacing all ...

**Question 356. Decode String** Suppose, you are given an encoded string. A string is encoded in some kind of pattern, your task is to decode the string. Let us say, < no of times string occurs > [string ] Example Input 3[b]2[bc] Output bbbcaca Explanation Here “b” occurs 3times and “ca” occur 2 times. ...

**Question 357. Prefix to Infix Conversion** In prefix to infix conversion problem, we have given expression in prefix notation. Write a program to convert it into an infix expression. Prefix Notation In this notation the operands are written after the operator. It is also known as Polish Notation. For instance : +AB is an prefix expression. ...

**Question 358. Postfix to Infix Conversion** In postfix to infix conversion problem, we have given expression in postfix notation. Write a program to convert the given notation in infix notation. Infix Notation In this notation, the operators are written between the operands. It is similar to how we generally write an expression. For instance: A + ...

**Question 359. Prefix to Postfix Conversion** In prefix to postfix conversion problem, we have given expression in prefix notation in string format. Write a program to convert the given notation in postfix notation. Prefix Notation In this notation, we write the operands after the operator. It is also known as Polish Notation. For instance: +AB is ...

**Question 360. Next Permutation** In the next permutation problem we have given a word, find the lexicographically greater_permutation of it. Example input : str = "tutorialcup" output : tutorialpcu input : str = "nmhdgfecba" output : nmheabcdfg input : str = "algorithms" output : algorithsm input : str = "spoonfeed" output : Next Permutation ...

**Question 361. Longest Common Subsequence** You are given two strings str1 and str2, find out the length of the longest common subsequence. Subsequence: a subsequence is a sequence that can be derived from another sequence by deleting some or no elements without changing the order of the remaining elements. For ex ‘tticp‘ is the subsequence ...

**Question 362. Repeated Substring Pattern** In repeated substring patterns we have given a string check if it can be constructed by taking a substring of itself and appending multiple copies of the substring together. Example Input 1: str = “abcabcabc” Output: True Explanation: “abcabcabc” can be formed by repeatedly appending “abc” to an empty string. ...

**Question 363. Letter Case Permutation** In letter case permutation we have given a string consisting of alphabets and numbers only, each character in the string can be converted into lowercase and uppercase, find out all different strings which can be obtained from different combinations of lowercase and uppercase of each character in the string. Example ...

**Question 364. Longest Common Prefix using Sorting** In the Longest Common Prefix using Sorting problem we have given a set of strings, find the longest common prefix. i.e. find the prefix part that is common to all the strings. Example Input1: {“tutorialcup”, “tutorial”, “tussle”, “tumble”} Output: "tu" Input2: {"baggage", "banana", "batsmen"} Output: "ba" Input3: {"abcd"} Output: "abcd" ...

**Question 365. Backspace String Compare** In the backspace string compare problem we have given two Strings S and T, check if they are equal or not. Note that the strings contain ‘#’ which means backspace character. Examples Input S = “ab#c” T = “ad#c” Output true (as both S and T converts to “ac”) Input ...

**Question 366. Word Pattern** We have all come across word patterns like “ABBA”, “AABB” and so on. We always wonder what this babble could relate to. Today we will try to solve a problem where we try to make use of the babble. A plethora of string problems does not help the case. Given ...

**Question 367. Regular Expression Matching** In the Regular Expression Matching problem we have given two strings one (let’s assume it x) consists of only lower case alphabets and second (let’s assume it y) consists of lower case alphabets with two special characters i.e, “.” and “*”. The task is to find whether the second string ...

**Question 368. Reorganize String** In Reorganize String problem we have given a string containing some characters “a-z” only. Our task is to rearrange those characters such that no two same characters are adjacent to each other. Example Input apple Output pelpa Input book Output obko Input aa Output not possible Input aaab Output not ...

**Question 369. String Compression** In the String Compression problem, we have given an array a[ ] of type char. Compress it as the character and count of a particular character (if the count of character is 1 then the only character is stored in a compressed array). The length of the compressed array should ...

**Question 370. Valid Parentheses LeetCode Solution** In Valid Parentheses LeetCode problem we have given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid. Here we will provide a Valid Parentheses LeetCode Solution to you. An input string is valid if: Open brackets must be closed ...

**Question 371. Longest Common Prefix using Trie** In the Longest Common Prefix using Trie problem we have given a set of strings, find the longest common prefix. i.e. find the prefix part that is common to all the strings. Example Input1: {“tutorialcup”, “tutorial”, “tussle”, “tumble”} Output: "tu" Input2: {"baggage", "banana", "batsmen"} Output: "ba" Input3: {"abcd"} Output: "abcd" ...

**Question 372. Valid Number** In the Valid Number problem we have given a string, check if it can be interpreted into a valid decimal number. It is to be noted that, for a given string to be interpreted as a valid decimal number. It should contain the following characters: Numbers 0-9 Exponent – “e” ...

**Question 373. Find the Closest Palindrome number** Problem In Find the Closest Palindrome number problem we have given a number n. Find a number which is a palindrome and the absolute difference between the palindromic number and n is as minimum as possible except zero. If there is more than one number satisfying this condition then print ...

**Question 374. Count and Say** Count and Say in which we have given a number N and we need to find the Nth term of the count and say sequence. Firstly we need to understand what is count and say sequence. Firstly see some terms of the sequence: 1st term is “1”. 2nd term is ...

**Question 375. Find unique character in a string** In Find unique character in a string problem, we have given a string containing only lower case alphabets(a-z). We need to find the first non-repeating character in it and print the index. if no such character exists print -1. Input Format Only a single line containing string. Output Format Print ...

**Question 376. Integer to Roman** Integer to Roman conversion. We have given a number N and we need to print the Roman number of N. Roman numbers are represented by the use of {I, V, X, L, C, D, M} values. Let’s see some examples for good understanding. Input Format Only a single line containing ...

**Question 377. Rabin Karp Algorithm** Rabin Karp Algorithm used to find the pattern string in the given text string. There are so many types of algorithms or methods used to find the pattern string. In this algorithm, we use Hashing for finding the pattern matching. If we got the same hash code for the substring ...

**Question 378. Guess The Word** Guess The Word is an interactive problem. An interactive problem means the data which is given to us is not predetermined. We can print values or call the specific function to interact or get more information regarding the solution. After each step, we also need to FLUSH the buffer to ...

**Question 379. Distinct Subsequences** Given two strings S and P1, we have to count all the number of distinct subsequences of S which equals P1. Note: A subsequence of a given string is a string that we archive by deleting some characters or possible zero characters also from the original string. We can’t change ...

**Question 380. Isomorphic Strings** Isomorphic Strings – Given two strings we need to check if for every occurrence of a character in string1 there is a unique mapping with characters in string2. In short, check, if there is one to one mapping or not. Example Input str1 = “aab” str2 = “xxy” Output True ...

**Question 381. Perform String Shifts Leetcode** A shift is a process in which alphabets are incremented by 1 in their ASCII value. For the last alphabet z it starts again i.e. shift of z will be a. In perform string shifts leetcode problem we have Given a string s (lowercase characters only) and an array a[ ...

**Question 382. String comparison containing wildcards** In String comparison containing wildcards problem, we have given two strings second string contains small alphabets and the first contains small alphabets and some wildcard patterns. Wildcard patterns are: ?: we can replace this wildcard with any small alphabet. *: we can replace this wildcard with any string. An empty ...

**Question 383. Check whether Strings are K Distance Apart or Not** Problem Statement Given two strings and an integer k, write a program to check whether the given strings are k distance apart or not. That is if any character is mismatched or any character is to be removed then it is known as k distance apart. Input Format The first ...

**Question 384. Generate all Binary Strings Without Consecutive 1’s** Problem Statement In the “Generate all binary strings without consecutive 1’s” problem we have given an integer k, write a program to print all binary strings of size k with no consecutive 1’s. Input Format The first and only one line containing an integer N. Output Format Print all possible ...

**Question 385. Sort a String According to Another String** Problem Statement Given two input strings, a pattern and a string. We need to sort the string according to the order defined by the pattern. Pattern string has no duplicates and it has all characters of the string. Input Format The first line containing a string s which we need ...

**Question 386. Check if String Follows Order of Characters by a Pattern or not** Problem Statement In the “Check if String Follows Order of Characters by a Pattern or not” problem we have to check if characters in the given input string follow the same order as determined by characters present in the given input pattern then print “Yes” else print “No”. Input Format ...

**Question 387. Reverse String Without Temporary Variable** Problem Statement In the “Reverse String Without Temporary Variable” problem we have given a string “s”. Write a program to reverse this string without using any extra variable or space. Input Format The first line containing the given string “s”. Output Format Print the string which is reverse of the ...

**Question 388. Print all Palindromic Partitions of a String** Problem Statement In the “Print all Palindromic Partitions of a String” problem we have given a string “s”. Write a program to print all possible palindromic partitioning of s. A palindrome is a word, number, phrase, or another sequence of characters that reads the same backward as forward, such as ...

**Question 389. Count the Pairs at Same Distance as in English Alphabets** Problem Statement In the “Count of Pairs at Same Distance as in English Alphabets” problem we have given a string “s”. Write a program that will print the number of pairs whose elements are at the same distance as in English alphabets. Input Format The first line containing the given ...

**Question 390. Minimum Characters to be Added at Front to Make String Palindrome** Problem Statement In the “Minimum Characters to be Added at Front to Make String Palindrome” problem we have given a string “s”. Write a program to find the minimum characters to be added at the front to make a string palindrome. Input Format The first and only one line containing ...

**Question 391. Kth Non-repeating Character** Problem Statement In the “Kth Non-repeating Character” we have given a string “s”. Write a program to find out the kth non-repeating_character. If there are less than k character which is non-repeating in the string then print “-1”. Input Format The first and only one line containing a string “s”. ...

**Question 392. Remove Minimum Characters so that Two Strings Become Anagrams** Problem Statement In the “Remove Minimum Characters so that Two Strings Become Anagrams” problem we have given two input strings. Find the minimum number of_characters to be removed from these two strings such that, they become anagrams. Input Format The first line containing a string “s”. The second line containing ...

**Question 393. Generate all Binary Strings from Given Pattern** Problem Statement In the “Generate all Binary Strings from Given Pattern” problem we have given input string “s” consists of 0, 1, and ? (wildcard char). We need to generate all possible binary strings by replacing ? with ‘0’ and ‘1’. Input Format The first and only one line containing ...

**Question 394. Print all Possible Ways to Break a String in Bracket Form** Problem Statement In the “Print all Possible Ways to Break a String in Bracket Form” problem, we have given a string “s”. Find all possible ways to break the given string in bracket form. Enclose all substrings within brackets (). Input Format The first and only one line containing a ...

**Question 395. Caesar Cipher** Description The Caesar Cipher technique is one of the earliest techniques of encryption. Here, for each letter in the given text, it is replaced by a letter some fixed number of positions down the alphabet. If n = 1, replace A with by B, B would become C, and so ...

**Question 396. Longest Palindrome can be Formed by Removing or Rearranging Characters** Problem Statement In the “Longest Palindrome can be Formed by Removing or Rearranging Characters” problem we have given a string “s”. Find the longest palindrome that can be constructed by removing or rearranging some characters or possibly zero characters from the string. There may be multiple solutions possible, you can ...

**Question 397. Longest Common Prefix Word by Word Matching** Problem Statement In the “Longest Common Prefix using Word by Word Matching” problem, we have given N strings. Write a program to find the longest common prefix of the given strings. Input Format The first line containing an integer value N which denotes the number of strings. Next N lines ...

**Question 398. Longest Common Prefix using Character by Character Matching** Problem Statement In the “Longest Common Prefix using Character by Character Matching” problem we have given an integer value N and N strings. Write a program to find the longest common prefix of the given strings. Input Format The first line containing an integer value N which denotes the number ...

**Question 399. Permutations of a Given String Using STL** Problem Statement In the “Permutations of a Given String Using STL” problem, we have given a string “s”. Print all the permutations of the input string using STL functions. Input Format The first and only one line containing a string “s”. Output Format Print all the permutation of the given ...

**Question 400. Longest Common Prefix using Divide and Conquer** Problem Statement In the “Longest Common Prefix using Divide and Conquer ” problem, we have given an integer n and n strings. Write a program that will print the longest common prefix. If there is no common prefix then print “-1”. Input Format The first line contains an integer n. ...

**Question 401. Longest Common Prefix Using Binary Search II** Problem Statement In the “Longest Common Prefix Using Binary Search II” problem we have given an integer value N and N strings. Write a program that will print the longest common prefix of given strings. If there is no common prefix then print “-1”. Input Format The first line containing ...

**Question 402. Palindrome Permutations of a String** Problem Statement In the “Palindrome Permutations of a String” problem, we have given an input string “s”. Print all the possible palindromes that can be generated using the characters of the string. Input Format The first and only one line containing a string “s”. Output Format Print all the possible ...

**Question 403. Check if Two given Strings are Isomorphic to each other** Problem Statement In the “Check if Two given Strings are Isomorphic to each other” problem we have given two strings s1 and s2. Write a program that says whether the given strings are isomorphic or not. Note: Two strings are said to be isomorphic if there is a one to ...

**Question 404. Length of Longest valid Substring** Problem Statement In the “Length of Longest valid Substring” we have given a string that contains the opening and closing parenthesis only. Write a program that will find the longest valid parenthesis substring. Input Format The first and only one line containing a string s. Output Format The first and ...

**Question 405. Smallest window in a string containing all characters of another string** Find the shortest substring in a given string that contains all the characters of a given word or Find the Smallest window in a string containing all characters of another string Given two strings s and t, write a function that will find the minimum window in s which will ...

**Question 406. Form Minimum Number from Given Sequence of D’s and I’s** Problem Statement In the “Form Minimum Number from Given Sequence of D’s and I’s” problem, we have given a pattern containing only I’s and D’s. I for increasing and D for decreasing. Write a program to print the minimum number following that pattern. Digits from 1-9 and digits can’t repeat. Input Format ...

**Question 407. Arrange given Numbers to Form the Biggest Number II** Problem Statement In the “Arrange given Numbers to Form the Biggest Number II” problem, we have given an array of positive integers. Arrange them in such a way that the arrangement will form the largest value. Input Format The first and only one line containing an integer n. Second-line containing ...

**Question 408. Check if a Linked list of Strings form a Palindrome** Problem Statement In the “Check if a Linked list of Strings form a Palindrome” problem we have given a linked list handling string data. Write a program to check whether the data forms a palindrom or not. Example ba->c->d->ca->b 1 Explanation: In the above example we can see that the ...

## Amazon Tree Questions

**Question 409. Populating Next Right Pointers in Each Node Leetcode Solution** Problem Statement The Populating Next Right Pointers in Each Node LeetCode Solution – “Populating Next Right Pointers in Each Node” states that given the root of the perfect binary tree and we need to populate each next pointer of the node to its next right node. If there is no next ...

**Question 410. Delete Nodes and Return Forest Leetcode Solution** Problem Statement The Delete Nodes and Return Forest LeetCode Solution – “Delete Nodes and Return Forest” states that given the root of the binary tree where each node has a distinct value. We’re also given an array, to_delete, where we need to delete all the nodes with values contained in ...

**Question 411. Recover Binary Search Tree Leetcode Solution** Problem Statement The Recover Binary Search Tree LeetCode Solution – “Recover Binary Search Tree” states that given the root of the binary search tree, where the values of exactly two nodes are swapped by mistake. We need to recover the tree without changing its structure. Example: Input: root = [1,3,null,null,2] Output: [3,1,null,null,2] ...

**Question 412. Symmetric Tree Leetcode Solution** Problem Statement The Symmetric Tree LeetCode Solution – “Symmetric Tree” states that given the root of the binary tree and we need to check if the given binary tree is a mirror of itself (symmetric around its center) or not? If Yes, we need to return true otherwise, false. Example: ...

**Question 413. Root to Leaf path with target sum Leetcode Solutions** A binary tree and an integer K are given. Our goal is to return whether there is a root-to-leaf path in the tree such that it’s sum is equal to the target-K. The sum of a path is the sum of all nodes that lie on it. 2 / \ ...

**Question 414. Scramble String** Problem Statement “Scramble String” problem states that you are given two strings. Check if the second string is a scrambled string of first one or not? Explanation Let string s = “great” Representation of s as binary tree by recursively dividing it into two non-empty sub-strings. This string can be ...

**Question 415. Queries for Number of Distinct Elements in a Subarray** We have given an array of integer and a number of queries and we have to find out the number of all the distinct elements we have within the given range, the query consists of two numbers left and right, this is the given range, with this given range we ...

**Question 416. Morris Traversal** Morris traversal is a method to traverse the nodes in a binary tree without using stack and recursion. Thus reducing the space complexity to linear. Inorder Traversal Example 9 7 1 6 4 5 3 1 / \ 2 ...

**Question 417. Kth ancestor of a node in binary tree** Problem Statement The problem “Kth ancestor of a node in binary tree” states that you are given a binary tree and a node. Now we need to find the kth ancestor of this node. An ancestor of any node is the nodes that lie on the path from the root ...

**Question 418. Inorder Successor of a node in Binary Tree** Problem Statement The problem asks to find “Inorder Successor of a node in Binary Tree”. An inorder successor of a node is a node in the binary tree that comes after the given node in the inorder traversal of the given binary tree. Example Inorder successor of 6 is 4 ...

**Question 419. Check if a given array can represent Preorder Traversal of Binary Search Tree** The problem “Check if a given array can represent Preorder Traversal of Binary Search Tree” states that you are given a preorder traversal sequence. Now consider this sequence and find out if this sequence can represent a binary search tree or not? The expected time complexity for the solution is ...

**Question 420. Construct Binary Tree from given Parent Array representation** The problem “Construct Binary Tree from given Parent Array representation” states that you are given an array. This input array represents a binary tree. Now you need to construct a binary tree on the basis of this input array. The array stores the index of parent node at each index. ...

**Question 421. Given a binary tree, how do you remove all the half nodes?** The problem “Given a binary tree, how do you remove all the half nodes?” states that you are given a binary tree. Now you need to remove the half nodes. A half node is defined as a node in the tree that has only a single child. Either it is ...

**Question 422. Iterative Preorder Traversal** The problem “Iterative Preorder Traversal” states that you are given a binary tree and now you need to find the preorder traversal of the tree. We are required to find the preorder traversal using iterative method and not the recursive approach. Example 5 7 9 6 1 4 3 ...

**Question 423. Find distance between two nodes of a Binary Tree** Problem Statement The problem “Find distance between two nodes of a Binary Tree” states that you are given a binary tree and you are given two nodes. Now you need to find the minimum distance between these two nodes. Example // Tree is shown using the image above node 1 ...

**Question 424. Write Code to Determine if Two Trees are Identical** The problem “Write Code to Determine if Two Trees are Identical” states that you are given two binary trees. find out if they are identical or not? Here, identical tree means that both the binary trees have the same node value with the same arrangement of nodes. Example Both trees ...

**Question 425. Boundary Traversal of binary tree** Problem Statement The problem “Boundary Traversal of binary tree” states that you are given a binary tree. Now you need to print the boundary view of a binary tree. Here boundary traversal means that all the nodes are shown as the boundary of the tree. The nodes are seen from ...

**Question 426. Diagonal Traversal of Binary Tree** Problem Statement The problem “Diagonal Traversal of Binary Tree” states that you are given a binary tree and now you need to find the diagonal view for the given tree. When we see a tree from the top-right direction. The nodes which are visible to us is the diagonal view ...

**Question 427. Bottom View of a Binary Tree** Problem Statement The problem “Bottom View of a Binary Tree” states that you are given a binary tree and now you need to find the bottom view for the given tree. When we see a tree from the downward direction. The nodes which are visible to us is the bottom ...

**Question 428. Print Right View of a Binary Tree** Problem Statement The problem “Print Right View of a Binary Tree” states that you are given a binary tree. Now you need to find the right view of this tree. Here, right view of the binary tree means to print the sequence as the tree looks when looked from the ...

**Question 429. Range LCM Queries** Problem Statement The problem “Range LCM Queries” states that you have an integer array and q number of queries. Each query contains the (left, right) as a range. The given task is to find out the LCM(left, right), i.e, LCM of all the number that comes in the range of ...

**Question 430. Find Maximum Level sum in Binary Tree** Problem Statement The problem “Find Maximum Level sum in Binary Tree” states that you are given a binary tree with positive and negative nodes, find the maximum sum of a level in the binary tree. Example Input 7 Explanation First Level : Sum = 5 Second Level : Sum = ...

**Question 431. Red-Black Tree Introduction** Red Black Tree is a self-balancing binary tree. In this tree, every node is either a red node or a black node. In this Red-black Tree Introduction, we will try to cover all of its basic properties. Properties of Red-Black Tree Every node is represented as either red or black. ...

**Question 432. Binary Search Tree Delete Operation** Problem Statement The problem “Binary Search Tree Delete Operation” asks us to implement the delete operation for binary search tree. Delete function refers to the functionality to delete a node with a given key/data. Example Input Node to be deleted = 5 Output Approach for Binary Search Tree Delete Operation So ...

**Question 433. Iterative Method to find Height of Binary Tree** Problem Statement The problem “Iterative Method to find Height of Binary Tree” states that you are given a binary tree, find the height of the tree using the iterative method. Examples Input 3 Input 4 Algorithm for Iterative Method to find Height of Binary Tree The height of a tree ...

**Question 434. Clone a Binary Tree with Random Pointers** Problem Statement You are given a complete binary tree with some random pointers. Random pointers are referred to nodes which every node points to other than its left and right child. So, this also changes the standard structure of a node in a simple binary tree. Now the node of ...

**Question 435. Level order traversal using two Queues** Problem Statement The problem “Level order traversal using two Queues” states that you are given a binary tree, print its level order traversal line by line. Examples Input 5 11 42 7 9 8 12 23 52 3 Input 1 2 3 4 5 6 Algorithm for Level Order Traversal ...

**Question 436. Check if all levels of two Binary Tree are anagrams or not** Problem Statement The problem “Check if all levels of two Binary Tree are anagrams or not” says that you are given two Binary Trees, check if all the levels of the two trees are anagrams or not. Examples Input true Input false Algorithm to Check if all levels of two ...

**Question 437. Check if the given array can represent Level Order Traversal of Binary Search Tree** Problem Statement The problem “Check if the given array can represent Level Order Traversal of Binary Search Tree” states that you are given a level order traversal of the binary search tree. And using the level order traversal of the tree. We need to efficiently find if the level order ...

**Question 438. Number of siblings of a given Node in n-ary Tree** Problem Statement The problem “Number of siblings of a given Node in n-ary Tree” states that you are given an n-ary Tree and a target node. Find the number of siblings of the target node. Assume that node is always present in the tree and the first node is the ...

**Question 439. Convert BST into a Min-Heap without using array** Problem Statement “Convert BST into a Min-Heap without using array” problem states that you are given a BST (binary search tree) and you need to convert it into a min-heap. The min-heap should contain all the elements in the binary search tree. The algorithm should run in linear time complexity. ...

**Question 440. Merge two BSTs with limited extra space** Problem Statement The problem “Merge two BSTs with limited extra space” states that you are given two binary search tree(BST) and you need to print the elements from both the trees in sorted order. That is in such an order that it seems that elements are from a single BST. ...

**Question 441. Iterative Postorder Traversal Using Two Stacks** Problem Statement The problem “Iterative Postorder Traversal Using Two Stacks” states that you are given a binary tree with n nodes. Write the program for it’s iterative postorder traversal using two stacks. Example Input 4 5 2 6 7 3 1 Input 4 2 3 1 Algorithm Create ...

**Question 442. Binary Tree to Binary Search Tree Conversion using STL set** Problem Statement We are given a binary tree and we need to convert it into a binary search tree. The problem “Binary Tree to Binary Search Tree Conversion using STL set” asks to do conversion using STL set. We have already discussed converting the binary tree into BST but we ...

**Question 443. K’th Largest element in BST using constant extra space** Problem Statement “K’th Largest element in BST using constant extra space” states that you are given a binary search tree and you need to find the kth largest element in it. So if we arrange the elements of the binary search tree in descending order then we need to return ...

**Question 444. K’th Largest Element in BST when modification to BST is not allowed** Problem Statement “K’th Largest Element in BST when modification to BST is not allowed” states that you are given a binary search tree and you need to find the kth largest element. This means that when all the elements of the binary search tree are arranged in descending order. Then ...

**Question 445. Iterative method to find ancestors of a given binary tree** Problem Statement “Iterative method to find ancestors of a given binary tree” problem states that you are given a binary tree and an integer representing a key. Create a function to print all the ancestors of the given key using iteration. Example Input key = 6 5 2 1 Explanation: ...

**Question 446. Check if each internal node of a BST has exactly one child** Problem Statement “Check if each internal node of a BST has exactly one child” problem states that you are given a preorder traversal of a binary search tree. And you need to find if all the non-leaf nodes contain only a single child. Here we also consider that all the ...

**Question 447. Find k-th smallest element in BST (Order Statistics in BST)** Problem Statement “Find k-th smallest element in BST (Order Statistics in BST)” problem states that you are given a binary search tree and you need to find the k-th smallest number in the BST. This means if we do an in-order traversal of the binary search tree and store the ...

**Question 448. Vertical sum in a given binary tree** Problem Statement “Vertical sum in a given binary tree” problem states that you are given a binary tree and we need to find the sum of each vertical level. By vertical level, we mean if we draw vertical lines at a distance of 1 unit in the left and right ...

**Question 449. A program to check if a binary tree is BST or not** Problem Statement “A program to check if a binary tree is BST or not” states that you are given a binary tree and you need to check if the binary tree satisfies the properties of the binary search tree. So, the binary tree has the following properties: The left subtree ...

**Question 450. Maximum Depth Of Binary Tree** Problem Statement “Maximum depth of binary tree” problem states that you are given a binary tree data structure. Print the maximum depth of the given binary tree. Example Input 2 Explanation: Maximum depth for the given tree is 2. Because there is only a single element below the root (i.e. ...

**Question 451. Convert BST to Min Heap** Problem Statement Given a complete Binary Search Tree, write an algorithm to convert it into a Min Heap, which is to convert BST to Min Heap. The Min Heap should be such that the values on the left of a node must be less than the values on the right ...

**Question 452. Merge Two Balanced Binary Search Trees** Problem Statement Given Two Balanced Binary Search Trees, there are n elements in the first BST and m elements in the second BST. Write an algorithm to merge two balanced binary search trees to form a third balanced Binary Search Tree with (n + m) elements. Example Input Output Pre-order ...

**Question 453. Binary Search Tree Search and Insertion** Problem Statement Write an algorithm to perform searching and insertion in Binary Search Tree. So what we are going to do is insert some of the elements from input into a binary search tree. Whenever asked to search a particular element, we’ll be searching it among the elements in BST(short ...

**Question 454. Check given array of size n can represent BST of n levels or not** Problem Statement Given an array with n elements, check given array of size n can represent BST of n levels or not. That is to check whether the binary search tree constructed using these n elements can represent a BST of n levels. Examples arr[] = {10, 8, 6, 9, ...

**Question 455. Binary Tree to Binary Search Tree Conversion** In binary tree to binary search tree conversion problem, we have given a binary tree convert it to Binary Search Tree without changing the structure of the tree. Example Input Output pre-order : 13 8 6 47 25 51 Algorithm We do not have to change the structure of the ...

**Question 456. Sorted Linked List to Balanced BST** In sorted linked list to balanced BST problem, we have given a singly Linked list in sorted order, construct a Balanced Binary Tree from the singly Linked List. Examples Input 1 -> 2 -> 3 -> 4 -> 5 Output Pre-order : 3 2 1 5 4 Input 7 -> ...

**Question 457. Sorted Array to Balanced BST** In sorted array to balanced BST problem, we have given an array in sorted order, construct a Balanced Binary Search Tree from the sorted array. Examples Input arr[] = {1, 2, 3, 4, 5} Output Pre-order : 3 2 1 5 4 Input arr[] = {7, 11, 13, 20, 22, ...

**Question 458. Transform a BST to Greater sum Tree** In transform a BST to greater sum tree Given a Binary Search Tree write an algorithm to convert it to a greater sum tree, that is, transform each node to contain the sum of all the elements greater than it. Example Input Output Pre-order : 69 81 87 34 54 ...

**Question 459. Advantages of BST over Hash Table** The most commonly used operations on any data structure are insertion, deletion, and searching. Hash Table is able to perform these three operations with the average time complexity of O(1), while self-balancing Binary Search Trees take O(log n) time complexity. At first, it seems as Hash Tables are better than ...

**Question 460. Construct BST from its given Level Order Traversal** Given the level order traversal of a Binary Search Tree, write an algorithm to construct the Binary Search Tree or BST from ITS given level order traversal. Example Input levelOrder[] = {18, 12, 20, 8, 15, 25, 5, 9, 22, 31} Output In-order : 5 8 9 12 15 18 ...

**Question 461. Construct BST from given Preorder Traversal** Given a pre-order traversal of a Binary Search Tree(BST), write an algorithm to construct the BST from given preorder traversal. Examples Input preOrder[] = {7, 5, 3, 6, 9} Output Inorder : 3 5 6 7 9 Input preOrder[] = {12, 6, 1, 35, 20} Output Inorder : 1 6 ...

**Question 462. Find the node with minimum value in a Binary Search Tree** Given a Binary Search Tree, write an algorithm to find the node with the minimum value in a given binary search tree. Example Input Output 5 Naive Approach A simple approach is to do a tree traversal and find the node with the minimum value among all the nodes. This ...

**Question 463. Construct Binary Tree from Given Inorder and Preorder Traversals** In this problem, we have inorder and preorder of the binary tree. We need to construct a binary tree from the given Inorder and Preorder traversals. Example Input: Inorder= [D, B, E, A, F, C] Preorder= [A, B, D, E, C, F] Output: Pre-order traversal of the tree formed by ...

**Question 464. Print Ancestors of a Given Binary Tree Node Without Recursion** Given a binary tree and a specific node or key. Print ancestors of a given binary tree node without recursion. Example Input : key = 7 Output : 3 1 Input : key = 4 Output : 2 1 Algorithm for Ancestors of a Given Binary Tree Node Create a class Node ...

**Question 465. Level order Traversal in Spiral Form** In this problem we have given a binary tree, print its level order traversal in a spiral form. Examples Input Output 10 30 20 40 50 80 70 60 Naive Approach for Level order Traversal in Spiral Form The idea is to do a normal level order traversal using a ...

**Question 466. Kth Smallest Element in a BST** In this problem, we have given a BST and a number k, find the kth smallest element in a BST. Examples Input tree[] = {5, 3, 6, 2, 4, null, null, 1} k = 3 Output 3 Input tree[] = {3, 1, 4, null, 2} k = 1 Output 1 ...

**Question 467. Balanced Binary Tree** In the balanced binary tree problem, we have given the root of a binary tree. We have to determine whether or not it is height balance. Examples Input Output true Input Output: false Balanced Binary Tree Every node in a balanced binary tree has a difference of 1 or less ...

**Question 468. Interval Tree** In the interval tree problem, we have given a set of intervals and three types of queries addInterval(x,y): Add an interval (x,y) to the set removeInterval(x,y): Remove an interval (x,y) from the set checkInterval(x,y): Check if interval (x,y) overlaps with some existing interval Design a data structure( Interval Tree ) ...

**Question 469. Construct Complete Binary Tree from its Linked List Representation** Given the linked list representation of a complete binary tree. The linked list is in the order of level order traversal of the tree. Write an algorithm to construct the complete binary tree back from its linked list representation. Example Input 1 -> 2 -> 3 -> 4 -> 5 ...

**Question 470. Lowest Common Ancestor** Given the root of a binary tree and two nodes n1 and n2, find the LCA(Lowest Common Ancestor) of the nodes. Example What is Lowest Common Ancestor(LCA)? The ancestors of a node n are the nodes present in the path between root and node. Consider the binary tree shown in ...

**Question 471. Lowest Common Ancestor in Binary Search Tree** Given the root of a binary search tree and two nodes n1 and n2, find the LCA(Lowest Common Ancestor) of the nodes in a given binary search tree. Example Naive Approach for Lowest Common Ancestor in Binary Search Tree Find the LCA(n1, n2) using the optimal approach to find LCA ...

**Question 472. Segment Tree** If we have performing addition on a given range of array whose element values updated any time. Then in that type of problem, we handle using a segment tree structure. Given an array a[] with n elements and you have to answer multiple queries, each of the queries is one ...

**Question 473. Print a Binary Tree in Vertical Order** In this problem, we have given a pointer denoting the root of the binary tree and your task is to print the binary tree in the vertical order. Example Input 1 / \ 2 3 / \ / \ 4 5 6 7 \ \ 8 9 Output 4 2 ...

**Question 474. Binary Search Tree** A binary search tree is a Binary tree with some rules that allows us to maintain the data in a sorted fashion. As it is a binary tree hence, a node can have at max 2 children. Structure of a Binary Search Tree node Rules for Binary tree to ...

**Question 475. Maximum Binary Tree** In this problem, we have given an array a[ ] of size n. Create the maximum binary tree from the array and return its root node. It is made from the array using the following steps : The root node of the tree should be the maximum value in the given ...

**Question 476. Binary Tree zigzag level order Traversal** Given a binary tree, print the zigzag level order traversal of its node values. (ie, from left to right, then right to left for the next level and alternate between). Example consider the binary tree given below Below is the zigzag level order traversal of the above binary tree Types ...

**Question 477. Recover Binary Search Tree** Consider a binary search tree, two nodes of the tree have been swapped, design an algorithm to recover the binary search Tree. Example Consider the binary search tree given below whose two nodes have been swapped as input. Incorrect nodes on the BST are detected(highlighted) and then swapped to obtain ...

**Question 478. Populating Next Right Pointers in Each Node** Given a Binary Tree, connect nodes that are at the same level from left to right. Structure of the Tree Node: A node of the tree contains 4 components which are data(integer value), pointers(next, left and right) of the tree node type. next pointer of a node point towards its ...

**Question 479. Top View of Binary Tree** The top view of a binary tree is the set of nodes visible when the tree is viewed from the top. Given a binary tree, the Output top view of the binary tree from the left-most horizontal level to the rightmost horizontal level. Example Example 1 Example 2 Types of ...

**Question 480. Level of Each node in a Tree from source node** Given a tree (an acyclic fully connected graph where constituent nodes are connected by bidirectional edges) and a source node. find the level of each node in a tree form source node. It is given that level of a node v with respect to the source is the distance between ...

**Question 481. Find Duplicate Subtrees** Duplicate Subtrees Subtrees are said to be duplicate if they have the same node values and structure. Given a binary tree with n nodes. Find all the duplicate subtrees and return their root node. Example Here, the subtrees 4 and 2->4 appear more than once therefore we will return root ...

**Question 482. Symmetric Tree** In Symmetric Tree problem we have given a binary tree, check whether it is a mirror of itself. A tree is said to be a mirror image of itself if there exists an axis of symmetry through a root node that divides the tree into two same halves. Example Types ...

**Question 483. Longest Common Prefix using Trie** In the Longest Common Prefix using Trie problem we have given a set of strings, find the longest common prefix. i.e. find the prefix part that is common to all the strings. Example Input1: {“tutorialcup”, “tutorial”, “tussle”, “tumble”} Output: "tu" Input2: {"baggage", "banana", "batsmen"} Output: "ba" Input3: {"abcd"} Output: "abcd" ...

**Question 484. Convert Sorted List to Binary Search Tree** Problem Given a linked list. The elements of the linked list are in increasing order. Convert the given linked list into a highly balanced binary search tree. A highly balanced binary search tree is a binary search tree in which the difference between the depth of two subtrees of any ...

**Question 485. Validate Binary Search Tree** Problem In Validate Binary Search Tree problem we have given the root of a tree, we have to check if it is a binary search tree or not. Example : Output: true Explanation: The given tree is a binary search tree because all elements which are left to each subtree ...

**Question 486. Path Sum** What is Path Sum Problem? In the Path Sum problem, we have given a binary tree and an integer SUM. We have to find if any path from the root to leaf has a sum equal to the SUM. Path sum is defined as the sum of all the nodes ...

**Question 487. Level Order Traversal of Binary Tree** Level Order Traversal of a given binary tree is the same as the BFS of the binary tree. Do we already know about what actually BFS is? if not then don’t need to feel bad just read the whole article and visit our previous articles for better understanding. BFS is a ...

**Question 488. Tree Traversal (Preorder, Inorder & Postorder)** First, we need to know about what is Traversal in Binary Tree. Traversal is a type of method in which we visit all the nodes exactly once in some specific manner/order. Basically there are two types of traversal in Binary Tree: Breadth-First Traversal Depth First Traversal We already know about ...

**Question 489. Deletion in a Binary Tree** Do we already know about what actually Binary Tree is? Now in this post, we are focusing on how to delete a node whose value is given. We are sure that the value of the node which we want to delete is always present before deletion in BT. In Binary ...

**Question 490. Unique Binary Search Trees** Firstly we have to find the total number of counts to form a unique binary search tree. After it, we construct all possible unique BST. First of all, we have to know the construction of BST. In a Binary Search Tree, the nodes present in the left subtree wrt. any ...

**Question 491. BFS vs DFS for Binary Tree** Breadth First Search (BFS) Do we already know about what actually BFS is? if not then don’t need to feel bad just read the whole article and visit our previous article on Breadth First Search for better understanding. BFS is a level order traversal in which we visit the nodes of ...

## Amazon Graph Questions

**Question 492. Find the Town Judge Leetcode Solution** Problem Statement In this problem, we are given n people labelled from 1 to n. We are also given a 2d array trust[][] shows that trust[i][0]th people trusts trust[i][1]th people for each 0 <= i < trust.length. We have to find a person “town judge” who does not trust any ...

**Question 493. Find the smallest binary digit multiple of given number** Problem Statement The problem “Find the smallest binary digit multiple of given number” states that you are given a decimal number N. So find the smallest multiple of N that contains only the binary digits ‘0’ and ‘1’. Example 37 111 A detailed explanation can be found below in the ...

**Question 494. Minimum Operations to convert X to Y** Problem Statement The problem “Minimum Operations to convert X to Y” states that you are given two numbers X and Y, it is needed to convert X into Y using following operations: Starting number is X. Following operations can be performed on X and on the numbers that are generated ...

**Question 495. Check if two nodes are on the same path in a Tree** Problem Statement The problem “Check if two nodes are on the same path in a Tree” states that you are given a n-ary tree (directed acyclic graph) rooted at root node with uni-directional edges between it’s vertices. You are also given a list of queries q. Each query in list ...

**Question 496. Distance of nearest cell having 1 in a binary matrix** Problem Statement The problem “Distance of nearest cell having 1 in a binary matrix” states that you are given a binary matrix(containing only 0s and 1s) with at least one 1. Find the distance of the nearest cell having 1 in the binary matrix for all the elements of the ...

**Question 497. Transpose Graph** Problem Statement The problem “Transpose graph” states that you are given a graph and you need to find the transpose of the given graph. Transpose: Transpose of a directed graph produces another graph with same edge & node configurations but the direction of all the edges have been reversed. Example ...

**Question 498. BFS for Disconnected Graph** Problem Statement The problem “BFS for Disconnected Graph” states that you are given a disconnected directed graph, print the BFS traversal of the graph. Example The BFS traversal of the graph above gives: 0 1 2 5 3 4 6 Approach Breadth first Search (BFS) traversal for Disconnected Directed Graph ...

**Question 499. Minimum Steps to reach target by a Knight** Description The problem “Minimum Steps to reach target by a Knight” states that you are given a square chess board of N x N dimensions, co-ordinates of the Knight piece, and the target cell. Find out the minimum number of steps taken by the Knight piece to reach the target ...

**Question 500. Iterative Depth First Traversal of Graph** In iterative depth first traversal of graph problem, we have given a graph data structure. Write the program to print the depth first traversal of the given graph using the iterative method. Example Input : 0 -> 1, 0 -> 2, 1 -> 2, 2 -> 0, 2 -> 3, 3 ...

**Question 501. Evaluate Division** In evaluate division problem we have given some equations, in the form, A/B = k, where A and B are strings and k is a real number. Answer some queries, if the answer does not exist return -1. Example Input: equations: a/b = 2.0 and b/c = 3.0 queries: a/c ...

**Question 502. Prim’s Algorithm** Prim’s algorithm is used to find the Minimum Spanning Tree(MST) of a connected or undirected graph. Spanning Tree of a graph is a subgraph that is also a tree and includes all the vertices. Minimum Spanning Tree is the spanning tree with a minimum edge weight sum. Example Graph Minimum ...

**Question 503. Max Area of Island** Problem Description: Given a 2D matrix, the matrix has only 0(representing water) and 1(representing land) as entries. An island in the matrix is formed by grouping all the adjacent 1’s connected 4-directionally(horizontal and vertical). Find the maximum area of the island in the matrix. Assume that all four edges of ...

**Question 504. Graph Cloning** What is Graph Cloning? Today we have with us a reference to an undirected graph. What do we have to do? Returning a deep copy of the provided graph. Let us look at the structure: The Class Node: It consists of the data value and the neighbors associated with each ...

**Question 505. Topological Sorting** Given a directed acyclic graph, topologically sort the graph nodes. Topological Sorting Example Topological sorting of above graph is -> {1,2,3,0,5,4} Theory Topological Sorting is done for a Directed Acyclic Graph (DAG). A DAG has no cycles in it. ie, there is no such path starting from any node of ...

**Question 506. Breadth First Search (BFS) for a Graph** Breadth First Search (BFS) for a graph is a traversing or searching algorithm in tree/graph data structure. It starts at a given vertex(any arbitrary vertex) and explores all the connected vertex and after that moves to the nearest vertex and explores all the unexplored nodes and takes care that no ...

**Question 507. Dijkstra Algorithm** Dijkstra is the shortest path algorithm. Dijkstra algorithm is used to find the shortest distance of all nodes from the given start node. It logically creates the shortest path tree from a single source node, by keep adding the nodes greedily such that at every point each node in the ...

## Amazon Stack Questions

**Question 508. Trapping Rain Water Leetcode Solution** Problem Statement The Trapping Rain Water LeetCode Solution – “Trapping Rain Water” states that given an array of heights which represents an elevation map where the width of each bar is 1. We need to find the amount of water trapped after rain. Example: Input: height = [0,1,0,2,1,0,1,3,2,1,2,1] Output: 6 Explanation: Check ...

**Question 509. Valid Parentheses Leetcode Solution** Problem Statement The Valid Parentheses LeetCode Solution – “Valid Parentheses” states that you’re given a string containing just the characters '(', ')', '{', '}', '[' and ']'. We need to determine whether the input string is a valid string or not. A string is said to be a valid string if open brackets must be closed ...

**Question 510. Maximum Frequency Stack Leetcode Solution** Problem Statement The Maximum Frequency Stack LeetCode Solution – “Maximum Frequency Stack” asks you to design a frequency stack in which whenever we pop an element from the stack, it should return the most frequent element present in the stack. Implement the FreqStack class: FreqStack() constructs an empty frequency stack. void push(int val) pushes ...

**Question 511. Design a Stack With Increment Operation Leetcode Solution** Problem Statement The Design a Stack With Increment Operation Leetcode Solution – states that we need to design a stack that supports the below operations efficiently. Assign the maximum capacity of the stack. Perform the push operation efficiently, if the size of the stack is strictly less than the maximum capacity of ...

**Question 512. Min Stack Leetcode Solution** Problem Statement Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) — Push element x onto stack. pop() — Removes the element on top of the stack. top() — Get the top element. getMin() — Retrieve the minimum element in the stack. ...

**Question 513. Next Greater Element I Leetcode Solution** Problem Statement In this problem, we are given two lists in which first list is subset of second list. For each element of first list, we have to find out next greater element in the second list. Example nums1 = [4,1,2], nums2 = [1,3,4,2] [-1,3,-1] Explanation: for first element of list1 i.e. for 4 there ...

**Question 514. Check if a given array can represent Preorder Traversal of Binary Search Tree** The problem “Check if a given array can represent Preorder Traversal of Binary Search Tree” states that you are given a preorder traversal sequence. Now consider this sequence and find out if this sequence can represent a binary search tree or not? The expected time complexity for the solution is ...

**Question 515. Form minimum number from given sequence** The problem “Form minimum number from given sequence” states that you are given some pattern of I’s and D’s only. The meaning of I stands for increasing and for decreasing we are provided with D. The problem statement asks to print the minimum number which satisfies the given pattern. We have ...

**Question 516. Range Queries for Longest Correct Bracket Subsequence** You are given a sequence of some brackets subsequence, in other words, you are given brackets like ‘(’ and ‘)’ and you are given a query range as a starting point and ending point. The problem “Range Queries for Longest Correct Bracket Subsequence” asks to find out the maximum length ...

**Question 517. Find Index of Closing Bracket for a Given Opening Bracket in an Expression** Problem Statement Given a string s of length/size n and an integer value representing the index of an opening square bracket. Find index of closing bracket for a given opening bracket in an expression. Example s = "[ABC[23]][89]" index = 0 8 s = "[C-[D]]" index = 3 5 s ...

**Question 518. Design a stack that supports getMin() in O(1) time and O(1) extra space** Design a stack that supports getMin() in O(1) time and O(1) extra space. Thus the special stack data structure must support all the operations of the stack like – void push() int pop() bool isFull() bool isEmpty() in constant time. Add an additional operation getMin() to return the minimum value ...

**Question 519. Sort a stack using recursion** Problem Statement The problem “Sort a stack using recursion” states that you are given a stack data structure. Sort its elements using recursion. Only the below-listed functions of the stack can be used – push(element) – to insert the element in the stack. pop() – pop() – to remove/delete the ...

**Question 520. Delete middle element of a stack** Problem Statement Given a data structure (stack). Write a program to delete the middle element of the given stack using the basic functions of the stack – push() – to insert an element in the stack. pop() – to remove/delete the top element from the stack. empty() – to check ...

**Question 521. Sorting array using Stacks** Problem statement The problem “Sorting array using Stacks” states that you are given a data structure array a[ ] of size n. Sort the elements of the given array using stack data structure. Example 2 30 -5 43 100 -5 2 30 43 100 Explanation: The elements are sorted in ...

**Question 522. Sort a stack using a temporary stack** Problem Statement The problem “Sort a stack using a temporary stack” states that you are given a stack data structure. Sort the elements of the given stack using a temporary stack. Example 9 4 2 -1 6 20 20 9 6 4 2 -1 2 1 4 3 6 5 ...

**Question 523. Reverse individual words** Problem Statement The problem “Reverse individual words” states that you are given a string s. Now, print the reverse of all the individual words in the string. Example s = "TutorialCup - changing the way of learning" puClairotuT - gnignahc eht yaw fo gninrael s = "Reverse individual words" esreveR ...

**Question 524. Remove brackets from an algebraic string containing + and – operators** Problem Statement You are given a string s of size n representing an arithmetic expression with parenthesis. The problem “Remove brackets from an algebraic string containing + and – operators” asks us to create a function that can simplify the given expression. Example s = "a-(b+c)" a-b-c s = a-(b-c-(d+e))-f a-b+c+d+e-f ...

**Question 525. Implement a stack using single queue** Problem Statement The problem “Implement a stack using single queue” asks us to implement a stack (LIFO) data structure using a queue (FIFO) data structure. Here LIFO means Last In First Out while FIFO means First In First Out. Example push(10) push(20) top() pop() push(30) pop() top() Top : 20 ...

**Question 526. Check if a queue can be sorted into another queue using a stack** Problem Statement The problem “Check if a queue can be sorted into another queue using a stack” states that you are given a queue containing n elements, the elements in the queue are a permutation of numbers 1 to n. Check if this queue can be arranged in increasing order ...

**Question 527. Form Minimum Number From Given Sequence** Problem Statement The problem “Form Minimum Number From Given Sequence states that you are given a string s of length/size n representing a pattern of characters ‘I’ i.e. increasing and ‘D’ i.e. decreasing only. Print the minimum number for the given pattern with unique digits from 1-9. For instance – ...

**Question 528. Iterative Postorder Traversal Using Two Stacks** Problem Statement The problem “Iterative Postorder Traversal Using Two Stacks” states that you are given a binary tree with n nodes. Write the program for it’s iterative postorder traversal using two stacks. Example Input 4 5 2 6 7 3 1 Input 4 2 3 1 Algorithm Create ...

**Question 529. Stack Permutations (Check if an array is stack permutation of other)** Problem Statement The problem “Stack Permutations (Check if an array is stack permutation of other)” states that you are given two arrays a[ ] and b[ ] of size n. All the elements of the array are unique. Create a function to check if the given array b[ ] is ...

**Question 530. Iterative method to find ancestors of a given binary tree** Problem Statement “Iterative method to find ancestors of a given binary tree” problem states that you are given a binary tree and an integer representing a key. Create a function to print all the ancestors of the given key using iteration. Example Input key = 6 5 2 1 Explanation: ...

**Question 531. Construct BST from given Preorder Traversal** Given a pre-order traversal of a Binary Search Tree(BST), write an algorithm to construct the BST from given preorder traversal. Examples Input preOrder[] = {7, 5, 3, 6, 9} Output Inorder : 3 5 6 7 9 Input preOrder[] = {12, 6, 1, 35, 20} Output Inorder : 1 6 ...

**Question 532. Print Ancestors of a Given Binary Tree Node Without Recursion** Given a binary tree and a specific node or key. Print ancestors of a given binary tree node without recursion. Example Input : key = 7 Output : 3 1 Input : key = 4 Output : 2 1 Algorithm for Ancestors of a Given Binary Tree Node Create a class Node ...

**Question 533. Find Maximum of Minimum for Every Window Size in a Given Array** Given an array a[ ] of size n. For every window size that varies from 1 to n in array print or find maximum of minimum for every window size in a given array. Example Input : a[ ] = {10, 20, 30, 50, 10, 70, 30} Output : 70 30 20 ...

**Question 534. Iterative Depth First Traversal of Graph** In iterative depth first traversal of graph problem, we have given a graph data structure. Write the program to print the depth first traversal of the given graph using the iterative method. Example Input : 0 -> 1, 0 -> 2, 1 -> 2, 2 -> 0, 2 -> 3, 3 ...

**Question 535. Minimum Bracket Reversals** In minimum bracket reversals problem, we have given a string s containing an expression of characters ‘{‘ and ‘}’ only. Find the minimum number of bracket reversals needed to make an expression balanced. Example Input : s = “}{” Output: 2 Input : s = “{{{” Output: The given expression can not ...

**Question 536. Expression Contains Redundant Bracket or Not** Given a string s containing an expression of operators, operands, and parenthesis. Find if the given string contains any unnecessary parenthesis without which the expression will still give the same result. In other words, we have to find that expression contains a redundant bracket or not. Redundant Bracket If an ...

**Question 537. Check if Two Expressions With Brackets are Same** Given two strings s1 and s2 representing expressions containing addition operator, subtraction operator, lowercase alphabets, and parenthesis. Check if two expressions with brackets are the same. Example Input s1 = “-(a+b+c)” s2 = “-a-b-c” Output Yes Input s1 = “a-b-(c-d)” s2 = “a-b-c-d” Output No Algorithm to Check if Two ...

**Question 538. Level order Traversal in Spiral Form** In this problem we have given a binary tree, print its level order traversal in a spiral form. Examples Input Output 10 30 20 40 50 80 70 60 Naive Approach for Level order Traversal in Spiral Form The idea is to do a normal level order traversal using a ...

**Question 539. Min Stack** In min stack problem we have to design a stack to implement the following functions efficiently, push(x) –> Push an element x to the stack pop() –> Removes the item on top of stack top() –> Return the element at top of stack getMin() –> Return the minimum element present ...

**Question 540. Queue using Stacks** In queue using a stack problem, we have to implement the following functions of a queue using the standard functions of stack data structure, Enqueue: Add an element to the end of the queue Dequeue: Remove an element from the start of the queue Example Input: Enqueue(5) Enqueue(11) Enqueue(39) Dequeue() ...

**Question 541. Arithmetic Expression Evaluation** We write Arithmetic expressions in following three notations – Prefix Notation In this notation, the operands are written after the operator. It is also known as Polish Notation. For instance: +AB is a prefix expression. Infix Notation In this notation, the operators are written between the operands. It is similar ...

**Question 542. Check for Balanced Parentheses in an Expression** Given a string s of length n. Check whether there is a closing parenthesis for every opening parentheses i.e. if all the parentheses are balanced. In other words, we can also say that, if we have a ‘}’, ‘)’ and ‘]’ for every ‘{‘, ‘(‘ and ‘[‘ respectively, the expression ...

**Question 543. Evaluation of Postfix Expression** In the Evaluation of the postfix expression problem, we have given a string s containing a postfix expression. Evaluate the given expression. Example Input : s = “231*+9-” Output : -4 Input : s = “100 200 + 2 / 5 * 7 +” Output : 757 For Operands Having Single Digits Algorithm ...

**Question 544. Find if an Expression has Duplicate Parenthesis or Not** Given a string containing balanced parenthesis. Find if the expression/string contains duplicate parenthesis or not. Duplicate Parenthesis When an expression is in the middle of or surrounded by the same type of balanced parenthesis i.e. enclosed between the same type of opening and closing parenthesis more than once it is ...

**Question 545. How to Implement Stack Using Priority Queue or Heap?** Implement a stack with the help of a priority queue or a heap. Priority Queue : Priority queue data structure is similar to the queue or stack data structure with an addition of priority. Every element is given a priority number. In conclusion, the elements with high priority are prefered ...

**Question 546. How to Efficiently Implement k Stacks in a Single Array?** Design and implement a new data structure that Implement k Stacks in a Single Array. The new data structure must support these two operations – push (element, stack_number): that pushes the element in a given number of the stack. pop (stack_number): that pop out the top element from a given ...

**Question 547. Find Maximum Depth of Nested Parenthesis in a String** Given a string s. Write the code to print the maximum depth of nested parenthesis in the given string. Example Input : s = “( a(b) (c) (d(e(f)g)h) I (j(k)l)m)” Output : 4 Input : s = “( p((q)) ((s)t) )” Output : 3 Using Stack Algorithm Initialize a string s of length ...

**Question 548. Expression Evaluation** In expression evaluation problem, we have given a string s of length n representing an expression that may consist of integers, balanced parentheses, and binary operations ( +, -, *, / ). Evaluate the expression. An expression can be in any one of prefix, infix, or postfix notation. Example See ...

**Question 549. How to Create Mergable Stack?** We have to design and create a stack that performs the operations in constant time. Here we have one problem which is how to create mergable stack? Here we perform the below operation for merge two stacks. push(element): Insert the element in the stack. pop(): Remove the top element in ...

**Question 550. The Stock Span Problem** This problem “The Stock Span Problem” comes under the financial aspect. In this problem, we find the stock span for the stock price of each day. The maximum number of consecutive days just before any particular day for which the price of the stock of the days before it is ...

**Question 551. Find Maximum Sum Possible Equal Sum of Three Stacks** Given 3 arrays stack1[ ], stack2[ ] and stack3[ ] representing stacks and the starting index of these arrays are treated as their top. Find the common maximum sum possible in all the three stacks i.e. the sum of elements of stack1, stack2 and stack3 are equal. Removal of the ...

**Question 552. Print Next Greater Number of Q queries** In Print Next Greater Number of Q queries problem we have given an array a[ ] of size n containing numbers and another array q[ ] of size m representing queries. Each query represents the index in array a[ ]. For each query, i print the number from the array ...

**Question 553. Check if an Array is Stack Sortable** In check if an array is stack sortable problem we have given an array a[ ] of size n containing elements from 1 to n in random order. Sort the array in ascending order using a temporary stack following only these two operations – Remove the element at the starting ...

**Question 554. Balanced Expression with Replacement** In Balanced Expression with Replacement problem we have given a string s containing parenthesis i.e. ‘(‘, ‘)’, ‘[‘, ‘]’, ‘{‘, ‘}’. The string also contains x at some places as a replacement of parenthesis. Check if the string can be converted into an expression with valid parenthesis after replacing all ...

**Question 555. Trapping Rain Water LeetCode Solution** In the Trapping Rain Water LeetCode problem, we have given N non-negative integers representing an elevation map and the width of each bar is 1. We have to find the amount of water that can be trapped in the above structure. Example Let’s understand that by an example For the ...

**Question 556. Decode String** Suppose, you are given an encoded string. A string is encoded in some kind of pattern, your task is to decode the string. Let us say, < no of times string occurs > [string ] Example Input 3[b]2[bc] Output bbbcaca Explanation Here “b” occurs 3times and “ca” occur 2 times. ...

**Question 557. Recursion** What is Recursion? Recursion is simply defined as a function calling itself. It uses its previously solved sub-problems to compute a bigger problem. It is one of the most important and tricky concepts in programming but we can understand it easily if we try to relate recursion with some real ...

**Question 558. Prefix to Infix Conversion** In prefix to infix conversion problem, we have given expression in prefix notation. Write a program to convert it into an infix expression. Prefix Notation In this notation the operands are written after the operator. It is also known as Polish Notation. For instance : +AB is an prefix expression. ...

**Question 559. Postfix to Infix Conversion** In postfix to infix conversion problem, we have given expression in postfix notation. Write a program to convert the given notation in infix notation. Infix Notation In this notation, the operators are written between the operands. It is similar to how we generally write an expression. For instance: A + ...

**Question 560. Prefix to Postfix Conversion** In prefix to postfix conversion problem, we have given expression in prefix notation in string format. Write a program to convert the given notation in postfix notation. Prefix Notation In this notation, we write the operands after the operator. It is also known as Polish Notation. For instance: +AB is ...

**Question 561. Postfix to Prefix Conversion** In this problem, we have given a string that denotes the postfix expression. We have to do postfix to prefix conversion. Prefix Notation In this notation, we write the operands after the operator. It is also known as Polish Notation. For instance: +AB is a prefix expression. Postfix Notation In ...

**Question 562. Binary Tree zigzag level order Traversal** Given a binary tree, print the zigzag level order traversal of its node values. (ie, from left to right, then right to left for the next level and alternate between). Example consider the binary tree given below Below is the zigzag level order traversal of the above binary tree Types ...

**Question 563. Backspace String Compare** In the backspace string compare problem we have given two Strings S and T, check if they are equal or not. Note that the strings contain ‘#’ which means backspace character. Examples Input S = “ab#c” T = “ad#c” Output true (as both S and T converts to “ac”) Input ...

**Question 564. Next greater element** The next greater element is a problem in which we have given an array. This array containing N values(may be positive or negative). We need to find the first greater_element in the given array on its right side. If there is no greater_element then take -1. Input Format First-line containing ...

**Question 565. Infix to Postfix** What is an infix expression? Expression in the form of ‘operand’ ‘operator’ ‘operand’ is called infix expression. Example: a+b What is postfix expression? Expression in the form of ‘operand’ ‘operand’ ‘operator’ is called postfix expression. Example: ab+ What is the need of infix to postfix conversion? Infix expression is easy ...

**Question 566. Form Minimum Number from Given Sequence of D’s and I’s** Problem Statement In the “Form Minimum Number from Given Sequence of D’s and I’s” problem, we have given a pattern containing only I’s and D’s. I for increasing and D for decreasing. Write a program to print the minimum number following that pattern. Digits from 1-9 and digits can’t repeat. Input Format ...

**Question 567. The Celebrity Problem** Problem Statement In the celebrity problem there is a room of N people, Find the celebrity. Conditions for Celebrity is- If A is Celebrity then Everyone else in the room should know A. A shouldn’t know anyone in the room. We need to find the person who satisfies these conditions. ...

**Question 568. Next Greater Element in an Array** Problem Statement Given an array, we will find the next greater element of each element in the array. If there is no next greater element for that element then we will print -1, else we will print that element. Note: Next greater element is the element that is greater and ...

## Amazon Queue Questions

**Question 569. Moving Average from Data Stream Leetcode Solution** Problem Statement The Moving Average from Data Stream LeetCode Solution – “Moving Average from Data Stream” states that given a stream of integers and a window size k. We need to calculate the moving average of all the integers in the sliding window. If the number of elements in the ...

**Question 570. Find Maximum Level sum in Binary Tree** Problem Statement The problem “Find Maximum Level sum in Binary Tree” states that you are given a binary tree with positive and negative nodes, find the maximum sum of a level in the binary tree. Example Input 7 Explanation First Level : Sum = 5 Second Level : Sum = ...

**Question 571. Implementation of Deque using Doubly Linked List** Problem Statement The problem “Implementation of Deque using Doubly Linked List” states that you need to implement the following functions of Deque or Doubly Ended Queue using a doubly linked list, insertFront(x) : Add element x at the starting of Deque insertEnd(x) : Add element x at the end of ...

**Question 572. Iterative Method to find Height of Binary Tree** Problem Statement The problem “Iterative Method to find Height of Binary Tree” states that you are given a binary tree, find the height of the tree using the iterative method. Examples Input 3 Input 4 Algorithm for Iterative Method to find Height of Binary Tree The height of a tree ...

**Question 573. Level order traversal using two Queues** Problem Statement The problem “Level order traversal using two Queues” states that you are given a binary tree, print its level order traversal line by line. Examples Input 5 11 42 7 9 8 12 23 52 3 Input 1 2 3 4 5 6 Algorithm for Level Order Traversal ...

**Question 574. Implement a stack using single queue** Problem Statement The problem “Implement a stack using single queue” asks us to implement a stack (LIFO) data structure using a queue (FIFO) data structure. Here LIFO means Last In First Out while FIFO means First In First Out. Example push(10) push(20) top() pop() push(30) pop() top() Top : 20 ...

**Question 575. Find the First Circular Tour that visits all the Petrol Pumps** Problem Statement The problem “Find the First Circular Tour that visits all the Petrol Pumps” states that there are N petrol pumps on a circular road. Given the petrol that every petrol pump has and the amount of petrol required to cover the distance between two petrol pumps. So you ...

**Question 576. Check if X can give change to every person in the Queue** Problem Statement X is an ice cream seller and there are n people waiting in a queue to buy an ice cream. Arr[i] denotes the denomination ith person in the queue has, the possible values of denominations are 5, 10 and 20. If the initial balance of X is 0 ...

**Question 577. Check if all levels of two Binary Tree are anagrams or not** Problem Statement The problem “Check if all levels of two Binary Tree are anagrams or not” says that you are given two Binary Trees, check if all the levels of the two trees are anagrams or not. Examples Input true Input false Algorithm to Check if all levels of two ...

**Question 578. Minimum sum of squares of character counts in a given string after removing k characters** Problem Statement The problem “Minimum sum of squares of character counts in a given string after removing k characters” states that you are given a string containing lower case characters only. You are allowed to remove k characters from the string such that in the remaining string the sum of ...

**Question 579. First negative integer in every window of size k** Problem Statement The problem “First negative integer in every window of size k” states that you are given an array containing positive and negative integers, for every window of size k print the first negative integer in that window. If there is no negative integer in any window then output ...

**Question 580. Queue based approach for first non-repeating character in a stream** Problem Statement The problem “Queue based approach for first non-repeating character in a stream” states that you are given a stream containing lower case characters, find the first non-repeating character whenever a new character is added to the stream, and if there is no non-repeating character return -1. Examples aabcddbe ...

**Question 581. Distance of nearest cell having 1 in a binary matrix** Problem Statement The problem “Distance of nearest cell having 1 in a binary matrix” states that you are given a binary matrix(containing only 0s and 1s) with at least one 1. Find the distance of the nearest cell having 1 in the binary matrix for all the elements of the ...

**Question 582. An Interesting Method to generate Binary Numbers from 1 to n** Problem Statement The problem “An Interesting Method to generate Binary Numbers from 1 to n” states that you are given a number n, print all the numbers from 1 to n in binary form. Examples 3 1 10 11 6 1 10 11 100 101 110 Algorithm The generation ...

**Question 583. Find the largest multiple of 3** Problem Statement The problem “Find the largest multiple of 3” states that you are given an array of positive integers(0 to 9). Find the maximum multiple of 3 that can be formed by rearranging the elements of the array. Examples arr[] = {5, 2, 1, 0, 9, 3} 9 5 ...

**Question 584. Check if the given array can represent Level Order Traversal of Binary Search Tree** Problem Statement The problem “Check if the given array can represent Level Order Traversal of Binary Search Tree” states that you are given a level order traversal of the binary search tree. And using the level order traversal of the tree. We need to efficiently find if the level order ...

**Question 585. Number of siblings of a given Node in n-ary Tree** Problem Statement The problem “Number of siblings of a given Node in n-ary Tree” states that you are given an n-ary Tree and a target node. Find the number of siblings of the target node. Assume that node is always present in the tree and the first node is the ...

**Question 586. Check if a queue can be sorted into another queue using a stack** Problem Statement The problem “Check if a queue can be sorted into another queue using a stack” states that you are given a queue containing n elements, the elements in the queue are a permutation of numbers 1 to n. Check if this queue can be arranged in increasing order ...

**Question 587. Priority Queue using doubly linked list** Problem Statement The problem “Priority Queue using doubly linked list” asks to implement the following functions of priority queue using doubly linked list. push(x, p) : Enqueue an element x with priority p in the priority queue at appropriate position. pop() : Remove and return the element with highest priority ...

**Question 588. Stack Permutations (Check if an array is stack permutation of other)** Problem Statement The problem “Stack Permutations (Check if an array is stack permutation of other)” states that you are given two arrays a[ ] and b[ ] of size n. All the elements of the array are unique. Create a function to check if the given array b[ ] is ...

**Question 589. Minimum Steps to reach target by a Knight** Description The problem “Minimum Steps to reach target by a Knight” states that you are given a square chess board of N x N dimensions, co-ordinates of the Knight piece, and the target cell. Find out the minimum number of steps taken by the Knight piece to reach the target ...

**Question 590. Implementation of Deque using circular array** Problem Statement “Implementation of Deque using circular array” asks to implement the following functions of a Deque(Doubly Ended Queue) using circular array, insertFront(x) : insert an element x at the front of Deque insertRear(x) : insert an element x at the rear of Deque deleteFront() : delete an element from ...

**Question 591. Find the node with minimum value in a Binary Search Tree** Given a Binary Search Tree, write an algorithm to find the node with the minimum value in a given binary search tree. Example Input Output 5 Naive Approach A simple approach is to do a tree traversal and find the node with the minimum value among all the nodes. This ...

**Question 592. Minimum Bracket Reversals** In minimum bracket reversals problem, we have given a string s containing an expression of characters ‘{‘ and ‘}’ only. Find the minimum number of bracket reversals needed to make an expression balanced. Example Input : s = “}{” Output: 2 Input : s = “{{{” Output: The given expression can not ...

**Question 593. Construct Complete Binary Tree from its Linked List Representation** Given the linked list representation of a complete binary tree. The linked list is in the order of level order traversal of the tree. Write an algorithm to construct the complete binary tree back from its linked list representation. Example Input 1 -> 2 -> 3 -> 4 -> 5 ...

**Question 594. Queue using Stacks** In queue using a stack problem, we have to implement the following functions of a queue using the standard functions of stack data structure, Enqueue: Add an element to the end of the queue Dequeue: Remove an element from the start of the queue Example Input: Enqueue(5) Enqueue(11) Enqueue(39) Dequeue() ...

**Question 595. How to Implement Stack Using Priority Queue or Heap?** Implement a stack with the help of a priority queue or a heap. Priority Queue : Priority queue data structure is similar to the queue or stack data structure with an addition of priority. Every element is given a priority number. In conclusion, the elements with high priority are prefered ...

**Question 596. Priority Queue in C++** FIFO manner is used to implement a queue. In a queue, insertions are done at one end (rear) and deletion takes place at another end (front). Basically, the element enters first is deleted first. We implement a priority queue using c++ inbuilt functions. Characteristics of Priority Queue A priority queue ...

**Question 597. Priority Queue** A priority queue is a type of data structure which is similar to a regular queue but has a priority associated with each of its element. Higher the priority earlier the element will be served. In some cases, there are two elements with the same priority then, the element enqueued ...

**Question 598. Binary Tree zigzag level order Traversal** Given a binary tree, print the zigzag level order traversal of its node values. (ie, from left to right, then right to left for the next level and alternate between). Example consider the binary tree given below Below is the zigzag level order traversal of the above binary tree Types ...

**Question 599. Queue Reconstruction by Height** Problem Description of Queue Reconstruction by Height Suppose you have a random list of people standing in a queue. Each person is described by a pair of integers (h, k), where h is the height of the person and k is the number of people in front of this person ...

**Question 600. Level Order Traversal of Binary Tree** Level Order Traversal of a given binary tree is the same as the BFS of the binary tree. Do we already know about what actually BFS is? if not then don’t need to feel bad just read the whole article and visit our previous articles for better understanding. BFS is a ...

**Question 601. Breadth First Search (BFS) for a Graph** Breadth First Search (BFS) for a graph is a traversing or searching algorithm in tree/graph data structure. It starts at a given vertex(any arbitrary vertex) and explores all the connected vertex and after that moves to the nearest vertex and explores all the unexplored nodes and takes care that no ...

## Amazon Matrix Questions

**Question 602. Unique Paths II Leetcode Solution** Problem Statement The Unique Paths II LeetCode Solution – “Unique Paths II” states that given the m x n grid where a robot starts from the top left corner of the grid. We need to find the total number of ways to reach the bottom right corner of the grid. ...

**Question 603. Search a 2D Matrix II Leetcode Solution** Problem Statement The Search a 2D Matrix II LeetCode Solution – “Search a 2D Matrix II”asks you to find an efficient algorithm that searches for a value target in an m x n integer matrix matrix. Integers in each row, as well as column, are sorted in ascending order. Example: Input: matrix = [[1,4,7,11,15],[2,5,8,12,19],[3,6,9,16,22],[10,13,14,17,24],[18,21,23,26,30]], target = 5 Output: true ...

**Question 604. Set Matrix Zeroes Leetcode Solution** Problem Statement The Set Matrix Zeroes LeetCode Solution – “Set Matrix Zeroes” states that you’re given an m x n integer matrix matrix.We need to modify the input matrix such that if any cell contains the element 0, then set its entire row and column to 0‘s. You must do it in ...

**Question 605. Word Search Leetcode Solution** Problem Statement Given an m x n board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially adjacent cells, where “adjacent” cells are horizontally or vertically neighbouring. The same letter cell may not be used more than once. Example ...

**Question 606. Unique Paths II** Suppose a man standing in the first cell or the top left corner of “a × b” matrix. A man can move only either up or down. That person wants to reach his destination and that destination for him is the last cell of the matrix or bottom right corner. ...

**Question 607. Find maximum length Snake sequence** The problem “Find maximum length Snake sequence” states that we are provided with a grid containing integers. The task is to find a snake sequence with the maximum length. A sequence having adjacent numbers in the grid with an absolute difference of 1, is known as a Snake sequence. Adjacent ...

**Question 608. Gold Mine Problem** Problem Statement The “Gold Mine problem” states that you are given a 2D grid having some non-negative coins placed in each cell of the given grid. Initially, the miner is standing at the first column but there is no restriction on the row. He can start in any row. The ...

**Question 609. Minimum time required to rot all oranges** Problem Statement The problem “Minimum time required to rot all oranges” states that you are given a 2D array, every cell has one of the three possible values 0, 1 or 2. 0 means an empty cell. 1 means a fresh orange. 2 means a rotten orange. If a rotten ...

**Question 610. Distance of nearest cell having 1 in a binary matrix** Problem Statement The problem “Distance of nearest cell having 1 in a binary matrix” states that you are given a binary matrix(containing only 0s and 1s) with at least one 1. Find the distance of the nearest cell having 1 in the binary matrix for all the elements of the ...

**Question 611. Find pairs with given sum such that elements of pair are in different rows** Problem Statement “Find pairs with given sum such that elements of pair are in different rows” problem states that you are given a matrix of integers and a value called “sum”. The problem statement asks to find out all the pairs in a matrix that sums up to a given ...

**Question 612. Common elements in all rows of a given matrix** Problem Statement “Common elements in all rows of a given matrix” problem state that, you are given a matrix of M*N. The problem statement asks to find out all the common elements in a given matrix in each row of the matrix in O(M*N) time. Example arr[]={{12, 1, 4, 5, ...

**Question 613. Collect maximum points in a grid using two traversals** Problem Statement We are given a matrix of size “n x m”, and we need to collect maximum points in a grid using two traversals. If we are standing at cell i,j then we have three options to go to cell i+1, j or i+1, j-1or i+1, j+1. That is ...

**Question 614. Mobile Numeric Keypad Problem** Problem Statement In the mobile numeric keypad problem, we consider a numeric keypad. We need to find all number of possible numeric sequences of given length such that you are only allowed to press buttons which are top, down, left, and right of the current button. You are not allowed ...

**Question 615. Printing brackets in Matrix Chain Multiplication Problem** Problem Statement We need to find the order of multiplication of matrices such that the number of operations involved in the multiplication of all the matrices is minimized. Then we need to print this order i.e. printing brackets in matrix chain multiplication problem. Consider you have 3 matrices A, B, ...

**Question 616. Largest rectangular sub-matrix whose sum is 0** Problem Statement Find the maximum size sub-matrix in a 2D array whose sum is zero. A sub-matrix is nothing but a 2D array inside of the given 2D array. So, you have a matrix of signed integers, you need to calculate the sum of sub-matrices and find the matrix with ...

**Question 617. Maximum sum rectangle in a 2D matrix** Problem Statement Find the maximum sum rectangle in a 2D matrix i.e. to find a sub-matrix with maximum sum. A sub-matrix is nothing but a 2D array inside of the given 2D array. So, you have a matrix of signed integers, you need to calculate the sum of sub-matrices and ...

**Question 618. Matrix Chain Multiplication** In the matrix chain multiplication II problem, we have given the dimensions of matrices, find the order of their multiplication such that the number of operations involved in multiplication of all the matrices is minimized. Consider you have 3 matrices A, B, C of sizes a x b, b x ...

**Question 619. Maximal Square** In the maximal square problem we have given a 2D binary matrix filled with 0’s and 1’s, find the largest square containing only 1’s, and return its area. Example Input: 1 0 1 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 1 0 ...

**Question 620. Set Matrix Zeroes** In the set matrix zeroes problem, we have given a (n X m) matrix, if an element is 0, set its entire row and column 0. Examples Input: { [1, 1, 1] [1, 0, 1] [1, 1, 1] } Output: { [1, 0, 1] [0, 0, 0] [1, 0, 1] ...

**Question 621. Flood Fill LeetCode** In Flood Fill problem we have given a 2D array a[ ][ ] representing an image of size mxn with each value representing the color of the pixel at that co-ordinate. Also given the location or coordinates of a pixel and a color. Replace the color at a given location ...

**Question 622. Max Area of Island** Problem Description: Given a 2D matrix, the matrix has only 0(representing water) and 1(representing land) as entries. An island in the matrix is formed by grouping all the adjacent 1’s connected 4-directionally(horizontal and vertical). Find the maximum area of the island in the matrix. Assume that all four edges of ...

**Question 623. Unique Paths** A m x n 2D grid is given and you are standing at the topmost and leftmost cell in the grid. i.e. the cell located at (1,1). Find the number of unique paths that can be taken to reach a cell located at (m,n) from the cell located at (1,1) ...

**Question 624. K-th Smallest Element in a Sorted Matrix** In K-th Smallest Element in a Sorted Matrix problem, we have given an n x n matrix, where every row and column is sorted in non-decreasing order. Find the kth smallest element in the given 2D array. Example Input 1: k = 3 and matrix = 11, 21, 31, 41 ...

**Question 625. Matrix Chain Multiplication using Dynamic Programming** Matrix Chain Multiplication is a method in which we find out the best way to multiply the given matrices. We all know that matrix multiplication is associative(A*B = B*A) in nature. So, we have a lot of orders in which we want to perform the multiplication. Actually, in this algorithm, ...

**Question 626. Multiplication of Two Matrices** Problem Statement In the “Multiplication of Two Matrices” problem we have given two matrices. We have to multiply these matrices and print the result or final matrix. Here, the necessary and sufficient condition is the number of columns in A should be equal to the number of rows in matrix ...

**Question 627. Check whether Strings are K Distance Apart or Not** Problem Statement Given two strings and an integer k, write a program to check whether the given strings are k distance apart or not. That is if any character is mismatched or any character is to be removed then it is known as k distance apart. Input Format The first ...

**Question 628. Find the Row with Maximum Number of 1’s** Problem Statement In the “Find the Row with Maximum Number of 1’s” problem we have given a matrix(2D array) containing binary digits with each row sorted. Find the row which has the maximum number of 1’s. Input Format The first line containing two integers values n, m. Next, n lines ...

**Question 629. The Celebrity Problem** Problem Statement In the celebrity problem there is a room of N people, Find the celebrity. Conditions for Celebrity is- If A is Celebrity then Everyone else in the room should know A. A shouldn’t know anyone in the room. We need to find the person who satisfies these conditions. ...

## Amazon Other Questions

**Question 630. Range Sum Query 2D – Immutable Leetcode Solution** Problem Statement Range Sum Query 2D – Immutable Leetcode Solution – Given a 2D matrix matrix, handle multiple queries of the following type: Calculate the sum of the elements of matrix inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). Implement the NumMatrix class: NumMatrix(int[][] matrix) Initializes the object with the integer ...

**Question 631. Partition Labels LeetCode Solution** Problem Statement Partition Labels LeetCode Solution – You are given a string s. We want to partition the string into as many parts as possible so that each letter appears in at most one part. Note that the partition is done so that after concatenating all the parts in order, the ...

**Question 632. Fibonacci Number LeetCode Solution** Problem Statement Fibonacci Number LeetCode Solution – “Fibonacci Number” states that The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding ones, starting from 0 and 1. That is, F(0) = 0, F(1) = 1 F(n) = F(n - 1) + F(n ...

**Question 633. Diagonal Traversal LeetCode Solution** Problem Statement Diagonal Traversal LeetCode Solution – Given a 2D integer array nums, return all elements of nums in diagonal order as shown in the below images. Input: nums = [[1,2,3],[4,5,6],[7,8,9]] Output: [1,4,2,7,5,3,8,6,9] Explanation for Diagonal Traversal LeetCode Solution Key Idea The first row and the last column in this problem would serve ...

**Question 634. Nearest Exit from Entrance in Maze LeetCode Solution** Problem Statement Nearest Exit from Entrance in Maze LeetCode Solution – We are given an m x n matrix “maze” (0-indexed) with empty cells represented as ‘.’ and walls as ‘+’. You are also given the entrance of the maze, where entrance = [entrance_row, entrance_col] denotes the row and column ...

**Question 635. Valid Tic-Tac-Toe State LeetCode Solution** Problem Statement Valid Tic-Tac-Toe State LeetCode Solution – We are given a Tic-Tac-Toe board as a string array board & are asked to return true iff it is possible to reach this board position during the course of a valid tic-tac-toe game. The board is a 3 x 3 array ...

**Question 636. Reverse Words in a String III LeetCode Solution** Problem Statement Reverse Words in a String III LeetCode Solution – We are given a string and are asked to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. Examples & Explanations Example 1: Input: s = "Let's take LeetCode ...

**Question 637. Filter Restaurants by Vegan-Friendly, Price and Distance Leetcode Solution** Problem Statement Filter Restaurants by Vegan-Friendly, Price, and Distance Leetcode Solution – Given the array restaurants where restaurants[i] = [idi, ratingi, veganFriendlyi, pricei, distancei]. You have to filter the restaurants using three filters. The veganFriendly filter will be either true (meaning you should only include restaurants with veganFriendlyi set it to true) or false (meaning you can include any ...

**Question 638. Brightest Position on Street LeetCode Solution** Problem Statement Brightest Position on Street LeetCode Solution – We are asked to assume a number line representing a street. This street contains lamp(s) on it. We are given a 2D integer array “lights”. Each lights[i] = [position_i, range_i] indicates that there is a street lamp on position_i which can ...

**Question 639. Remove Duplicates from Sorted List LeetCode Solution** Problem Statement Remove Duplicates from Sorted List LeetCode Solution – We are given the head of a sorted linked list. We are asked to delete all the duplicates such that each element appears only once and return the linked list sorted as well. Examples & Explanations Example 1: Input: head ...

**Question 640. Clone Graph LeetCode Solution** Problem Statement Clone Graph LeetCode Solution – We are given a reference of a node in a connected undirected graph and are asked to return a deep copy of the graph. A deep copy is basically a clone where no node present in the deep copy should have the reference ...

**Question 641. Minimum Height Trees LeetCode Solution** Problem Statement Minimum Height Trees LeetCode Solution – We are given a tree of n nodes labelled from 0 to n-1 as a 2D array “edges” where edge[i] = [a_i, b_i] indicates that there is an undirected edge between the two nodes a_i and b_i in the tree. We have ...

**Question 642. Kth Smallest Element in a Sorted Matrix LeetCode Solution** Problem Statement Kth Smallest Element in a Sorted Matrix LeetCode Solution – We are given a matrix of size n where each of the rows and columns is sorted in ascending order. We are asked to return the kth smallest element in the matrix. Note that it is the kth ...

**Question 643. Number of Islands II LeetCode Solution** Problem Statement Number of Islands II LeetCode Solution – You are given an empty 2D binary grid grid of size m x n. The grid represents a map where 0‘s represent water and 1‘s represent land. Initially, all the cells grid are water cells (i.e., all the cells are 0‘s). We may perform an add land ...

**Question 644. Construct Binary Tree from Preorder and Postorder Traversal LeetCode Solution** Problem Statement Construct Binary Tree from Preorder and Postorder Traversal LeetCode Solution – Given two integer arrays, preorder and postorder where preorder is the preorder traversal of a binary tree of distinct values and postorder is the postorder traversal of the same tree, reconstruct and return the binary tree. If there exist multiple answers, you can return any of them. Input: preorder ...

**Question 645. Number of Dice Rolls With Target Sum LeetCode Solution** Problem Statement Number of Dice Rolls With Target Sum LeetCode Solution – You have n dice and each die has k faces numbered from 1 to k. Given three integers n, k, and target, return the number of possible ways (out of the kn total ways) to roll the dice so the sum of the face-up numbers equals target. Since the answer may be ...

**Question 646. Remove Duplicates from Sorted List II LeetCode Solution** Problem Statement Remove Duplicates from Sorted List II LeetCode Solution – Given the head of a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. Return the linked list sorted as well. Input: head = [1,2,3,3,4,4,5] Output: [1,2,5] Explanation The idea here is to traverse ...

**Question 647. Shortest Path in a Grid with Obstacles Elimination LeetCode Solution** Problem Statement Shortest Path in a Grid with Obstacles Elimination LeetCode Solution – You are given an m x n integer matrix grid where each cell is either 0 (empty) or 1 (obstacle). You can move up, down, left, or right from and to an empty cell in one step. Return the minimum number of steps to walk from the upper left ...

**Question 648. Can Place Flowers LeetCode Solution** Problem Statement Can Place Flowers LeetCode Solution – You have a long flowerbed in which some of the plots are planted, and some are not. However, flowers cannot be planted in adjacent plots. Given an integer array flowerbed containing 0‘s and 1‘s, where 0 means empty and 1 means not empty, and an integer n, return if n new flowers can be planted in ...

**Question 649. First Unique Character in a String LeetCode Solution** Problem Statement First Unique Character in a String LeetCode Solution – Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1. Example Test Case 1: Input: s = “leetcode” Output: 0 Test Case 2: Input: s = “aabb” Output: -1 Explanation ...

**Question 650. Analyze User Website Visit Pattern LeetCode Solution** Problem Statement Analyze User Website Visit Pattern LeetCode Solution – You are given two string arrays username and website and an integer array timestamp. All the given arrays are of the same length and the tuple [username[i], website[i], timestamp[i]] indicates that the user username[i] visited the website website[i] at time timestamp[i]. A pattern is a list of three websites (not necessarily distinct). For example, ["home", ...

**Question 651. Invert Binary Tree LeetCode Solution** Problem Statement: Invert Binary Tree LeetCode Solution – In this question, Given a root of any binary tree, the solution is required to invert the binary tree meaning the left tree should become the right tree and vice versa. Explanation We can ask ourselves which tree traversal would be ...

**Question 652. Closest Binary Search Tree Value Leetcode Solution** Problem Statement : Closest Binary Search Tree Value Leetcode Solution – Given the root of a binary search tree and a target value, return the value in the BST that is closest to the target. Example : Example 1 Input: root = [4,2,5,1,3], target = 3.714286 Output: 4 Example 2 Input: root = [1], target ...

**Question 653. Partition List Leetcode Solution** Problem Statement : Partition List Leetcode Solution – Given the head of a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should preserve the original relative order of the nodes in each of the two partitions. Example : Example 1 Input: head = ...

**Question 654. Design Browser History LeetCode Solution** Problem Statement Design Browser History LeetCode Solution – You have a browser with one tab where you start on the homepage and you can visit another url, get back in the history number of steps or move forward in the history number of steps. Implement the BrowserHistory class: BrowserHistory(string homepage) Initializes the object with the homepage of the ...

**Question 655. Evaluate Reverse Polish Notation LeetCode Solution** Problem Statement Evaluate Reverse Polish Notation LeetCode Solution – Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, and /. Each operand may be an integer or another expression. Note that the division between two integers should truncate toward zero. It is guaranteed that the given ...

**Question 656. 3Sum Closest LeetCode Solution** Problem Statement 3Sum Closest LeetCode Solution – Given an integer array nums of length n and an integer target, find three integers in nums such that the sum is closest to target. Return the sum of the three integers. You may assume that each input would have exactly one solution. Input: nums = [-1,2,1,-4], target = 1 Output: ...

**Question 657. Contiguous Array LeetCode Solution** Problem Statement Contiguous Array LeetCode Solution – Given a binary array nums, return the maximum length of a contiguous subarray with an equal number of 0 and 1. Input: nums = [0,1] Output: 2 Explanation: [0, 1] is the longest contiguous subarray with an equal number of 0 and 1. Explanation Now what we ...

**Question 658. Maximum Number of Occurrences of a Substring Leetcode Solution** Problem Statement : Maximum Number of Occurrences of a Substring Leetcode Solution – Given a string s, return the maximum number of occurrences of any substring under the following rules: The number of unique characters in the substring must be less than or equal to maxLetters. The substring size must be between minSize and maxSize inclusive. Example ...

**Question 659. N-Queens LeetCode Solution** Problem Statement N-Queens LeetCode Solution – The n-queens puzzle is the problem of placing n queens on a n x n chessboard such that no two queens attack each other. Given an integer n, return all distinct solutions to the n-queens puzzle. You may return the answer in any order. Each solution contains a distinct board configuration of the ...

**Question 660. Largest Rectangle in Histogram LeetCode Solution** Problem Statement Largest Rectangle in Histogram LeetCode Solution – Given an array of integers heights representing the histogram’s bar height where the width of each bar is 1, return the area of the largest rectangle in the histogram. Example Test Case 1: Input: heights = [2, 1, 5, 6, 2, 3] Output: 10 Explanation: ...

**Question 661. Regular Expression Matching Regular Expression Matching LeetCode Solution** Problem Statement Regular Expression Matching Regular Expression Matching LeetCode Solution – Given an input string s and a pattern p, implement regular expression matching with support for '.' and '*' where: '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). Example Test Case 1: Input: ...

**Question 662. Binary Tree Right Side View LeetCode Solution** Problem Statement Binary Tree Right Side View LeetCode Solution – Given the root of a binary tree, imagine yourself standing on the right side of it, and return the values of the nodes you can see ordered from top to bottom. Example Test Case 1: Input: root = [1, 2, 3, null, 5, null, ...

**Question 663. Zigzag Conversion LeetCode Solution** Problem Statement Zigzag Conversion LeetCode Solution – The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) P A H N A P L S I I G Y I ...

**Question 664. Maximize Distance to Closest Person LeetCode Solution** Problem Statement Maximize Distance to Closest Person LeetCode Solution – You are given an array representing a row of seats where seats[i] = 1 represents a person sitting in the ith seat, and seats[i] = 0 represents that the ith seat is empty (0-indexed). There is at least one empty seat, and at least one person sitting. Alex wants to ...

**Question 665. Third Maximum Number Leetcode Solution** Problem Statement Third Maximum Number Leetcode Solution – Given an integer array nums, return the third distinct maximum number in this array. If the third maximum does not exist, return the maximum number. Example Input: nums = [3,2,1] Output: 1 Explanation: The first distinct maximum is 3. The second distinct maximum is 2. The third ...

**Question 666. Minesweeper LeetCode Solution** Problem Statement Minesweeper LeetCode Solution – Let’s play the minesweeper game (Wikipedia, online game)! You are given an m x n char matrix board representing the game board where: 'M' represents an unrevealed mine, 'E' represents an unrevealed empty square, 'B' represents a revealed blank square that has no adjacent mines (i.e., above, below, left, right, and all ...

**Question 667. Koko Eating Bananas LeetCode Solution** Problem Statement Koko Eating Bananas LeetCode Solution – Koko loves to eat bananas. There are n piles of bananas, the ith pile has piles[i] bananas. The guards have gone and will come back in h hours. Koko can decide her bananas-per-hour eating speed of k. Each hour, she chooses some pile of bananas and eats k bananas from that pile. If ...

**Question 668. Time Based Key-Value Store LeetCode Solution** Problem Statement Time Based Key-Value Store LeetCode Solution – Design a time-based key-value data structure that can store multiple values for the same key at different time stamps and retrieve the key’s value at a certain timestamp. Implement the TimeMap class: TimeMap() Initializes the object of the data structure. void set(String key, String ...

**Question 669. Find Median from Data Stream LeetCode Solution** Problem Statement Find Median from Data Stream LeetCode Solution – The median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value and the median is the mean of the two middle values. For example, for arr = [2,3,4], the median ...

**Question 670. Permutation in String Leetcode Solution** Problem Statement : Permutation in String Leetcode Solution – Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. In other words, return true if one of s1‘s permutations is the substring of s2. Example : Example 1 Input: s1 = "ab", s2 = "eidbaooo" Output: true Explanation: s2 contains one permutation of s1 ("ba"). ...

**Question 671. Determine Whether Matrix Can Be Obtained By Rotation LeetCode Solution** Problem Statement Determine Whether Matrix Can Be Obtained By Rotation LeetCode Solution – Given two n x n binary matrices mat and target, return true if it is possible to make mat equal to target by rotating mat in 90-degree increments, or false otherwise. Examples Input: mat = [[0,1],[1,0]], target = [[1,0],[0,1]] Output: true Explanation: We can rotate mat 90 degrees clockwise to make mat equal ...

**Question 672. Asteroid Collision LeetCode Solution** Problem Statement Asteroid Collision LeetCode Solution – We are given an array asteroids of integers representing asteroids in a row. For each asteroid, the absolute value represents its size, and the sign represents its direction (positive meaning right, negative meaning left). Each asteroid moves at the same speed. Find out the state ...

**Question 673. Reorder Data in Log Files LeetCode Solution** Problem Statement Reorder Data in Log Files LeetCode Solution – You are given an array of logs. Each log is a space-delimited string of words, where the first word is the identifier. There are two types of logs: Letter-logs: All words (except the identifier) consist of lowercase English letters. Digit-logs: All words ...

**Question 674. Longest Increasing Path in a Matrix LeetCode Solution** Problem Statement Longest Increasing Path in a Matrix LeetCode Solution – Given an m x n integers matrix, return the length of the longest increasing path in matrix. From each cell, you can either move in four directions: left, right, up, or down. You may not move diagonally or move outside the boundary (i.e., wrap-around is not allowed). Input: ...

**Question 675. Optimal Account Balancing LeetCode Solution** Problem Statement Optimal Account Balancing LeetCode Solution – You are given an array of transactions transactions where transactions[i] = [fromi, toi, amounti] indicates that the person with ID = fromi gave amounti $ to the person with ID = toi. Return the minimum number of transactions required to settle the debt. Input: transactions = [[0,1,10],[2,0,5]] Output: 2 Explanation: Person #0 ...

**Question 676. Number of Closed Islands Leetcode Solution** Problem Statement : Number of Closed Islands Leetcode Solution – Given a 2D grid consisting of 0s (land) and 1s (water). An island is a maximal 4-directionally connected group of 0s and a closed island is an island totally (all left, top, right, bottom) surrounded by 1s. Return the number of closed islands. Example : Example 1 Input: grid = [[1,1,1,1,1,1,1,0],[1,0,0,0,0,1,1,0],[1,0,1,0,1,1,1,0],[1,0,0,0,0,1,0,1],[1,1,1,1,1,1,1,0]] Output: 2 Explanation: Islands in gray ...

**Question 677. Serialize and Deserialize Binary Tree LeetCode Solution** Problem Statement Serialize and Deserialize Binary Tree LeetCode Solution – Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in ...

**Question 678. Binary Tree Maximum Path Sum LeetCode Solution** Problem Statement Binary Tree Maximum Path Sum LeetCode Solution – A path in a binary tree is a sequence of nodes where each pair of adjacent nodes in the sequence has an edge connecting them. A node can only appear in the sequence at most once. Note that the path does not need ...

**Question 679. Robot Bounded In Circle LeetCode Solution** Problem Statement Robot Bounded In Circle LeetCode Solution – On an infinite plane, a robot initially stands at (0, 0) and faces north. Note that: The north direction is the positive direction of the y-axis. The south direction is the negative direction of the y-axis. The east direction is the positive direction of the x-axis. The west direction is the ...

**Question 680. Minimum Knight Moves LeetCode Solution** Problem Statement Minimum Knight Moves LeetCode Solution – In an infinite chessboard with coordinates from -infinity to +infinity, you have a knight at square [0, 0]. A knight has 8 possible moves it can make, as illustrated below. Each move is two squares in a cardinal direction, then one square in an orthogonal direction. Return the minimum number ...

**Question 681. Minimum Number of Taps to Open to Water a Garden LeetCode Solution** Problem Statement Minimum Number of Taps to Open to Water a Garden LeetCode Solution – There is a one-dimensional garden on the x-axis. The garden starts at the point 0 and ends at the point n. (i.e The length of the garden is n). There are n + 1 taps located at points [0, 1, ..., n] in ...

**Question 682. Binary Tree Zigzag Level Order Traversal LeetCode Solution** Problem Statement Binary Tree Zigzag Level Order Traversal LeetCode Solution – Given the root of a binary tree, return the zigzag level order traversal of its nodes’ values. (i.e., from left to right, then right to left for the next level and alternate between). Input: root = [3,9,20,null,null,15,7] Output: [[3],[20,9],[15,7]] Explanation We ...

**Question 683. Find the Duplicate Number LeetCode Solution** Problem Statement Find the Duplicate Number LeetCode Solution – Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive. There is only one repeated number in nums, return this repeated number. You must solve the problem without modifying the array nums and uses only constant extra space. Input: nums = [1,3,4,2,2] Output: 2 Explanation ...

**Question 684. Snakes and Ladders LeetCode Solution** Problem Statement Snakes and Ladders LeetCode Solution – You are given an n x n integer matrix board where the cells are labeled from 1 to n2 in a Boustrophedon style starting from the bottom left of the board (i.e. board[n - 1][0]) and alternating directions in each row. You start on the square 1 of the board. In each move, ...

**Question 685. Missing Element in Sorted Array LeetCode Solution** Problem Statement: Missing Element in Sorted Array LeetCode Solution – Given an integer array nums which are sorted in ascending order and all of its elements are unique and given also an integer k, return the kth missing number starting from the leftmost number of the array. Example: Example 1 Input: nums = [4,7,9,10], k = ...

**Question 686. Path Sum II LeetCode Solution** Problem Statement : Path Sum II LeetCode Solution – Given the root of a binary tree and an integer targetSum, return all root-to-leaf paths where the sum of the node values in the path equals targetSum. Each path should be returned as a list of the node values, not node references. A root-to-leaf path is a path starting from ...

**Question 687. Alien Dictionary LeetCode Solution** Problem Statement Alien Dictionary LeetCode Solution – There is a new alien language that uses the English alphabet. However, the order among the letters is unknown to you. You are given a list of strings words from the alien language’s dictionary, where the strings in words are sorted lexicographically by the rules of this new language. ...

**Question 688. Product of Array Except Self LeetCode Solution** Problem Statement Product of Array Except Self LeetCode Solution – Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i]. The product of any prefix or suffix of nums is guaranteed to fit in a 32-bit integer. You must write an algorithm that runs in O(n) time and without using the division ...

**Question 689. Scramble String LeetCode Solution** Problem Statement Scramble String LeetCode Solution – We can scramble a string s to get a string t using the following algorithm: If the length of the string is 1, stop. If the length of the string is > 1, do the following: Split the string into two non-empty substrings ...

**Question 690. Sum of Left Leaves LeetCode Solution** Problem Statement: Sum of Left Leaves LeetCode Solution – Given the root of a binary tree, return the sum of all left leaves. A leaf is a node with no children. A left leaf is a leaf that is the left child of another node. Example & Explanation: Input: root = [3,9,20,null,null,15,7] Output: 24 Explanation: There ...

**Question 691. Intersection of Two Linked Lists LeetCode Solution** Problem Statement Intersection of Two Linked Lists LeetCode Solution – We are given the heads of two strongly linked-lists headA and headB. It is also given that the two linked lists may intersect at some point. We are asked to return the node at which they intersect or null if ...

**Question 692. Permutation Sequence LeetCode Solution** Problem Statement Permutation Sequence LeetCode Solution – The set [1, 2, 3, ..., n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, we get the following sequence for n = 3: "123" "132" "213" "231" "312" "321" Given n and k, return the kth permutation sequence. Example Test Case 1: Input: n ...

**Question 693. Find Largest Value in Each Tree Row LeetCode Solution** Problem Statement Find Largest Value in Each Tree Row LeetCode Solution – Given the root of a binary tree, return an array of the largest value in each row of the tree (0-indexed). Example Test Case 1: Input: root = [1, 3, 4, 5, 3, null, 9] Output: [1, 3, 9] Explanation 1, 3, and ...

**Question 694. Search Suggestions System LeetCode Solution** Problem Statement Search Suggestions System LeetCode Solution – You are given an array of strings products and a string searchWord. Design a system that suggests at most three product names from products after each character of searchWord is typed. Suggested products should have a common prefix with searchWord. If there are more than three products with a ...

**Question 695. Rotate Image LeetCode Solution** Problem Statement Rotate Image LeetCode Solution – You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise). You have to rotate the image in-place, which means you have to modify the input 2D matrix directly. DO NOT allocate another 2D matrix and do the rotation. Example Test Case 1: Input: ...

**Question 696. Peeking Iterator LeetCode Solution** Problem Statement Peeking Iterator LeetCode Solution – Design an iterator that supports the peek operation on an existing iterator in addition to the hasNext and the next operations. Implement the PeekingIterator class: PeekingIterator(Iterator<int> nums) Initializes the object with the given integer iterator iterator. int next() Returns the next element in the array and moves the pointer to the next element. boolean ...

**Question 697. Orderly Queue LeetCode Solution** Problem Statement Orderly Queue LeetCode Solution – You are given a string s and an integer k. You can choose one of the first k letters of s and append it at the end of the string. Return the lexicographically smallest string you could have after applying the mentioned step any number of moves. Input: s ...

**Question 698. Defanging an IP Address LeetCode Solution** Problem Statement Defanging an IP Address LeetCode Solution – Given a valid (IPv4) IP address, return a defanged version of that IP address. A defanged IP address replaces every period "." with "[.]". Input: address = "1.1.1.1" Output: "1[.]1[.]1[.]1" Explanation The intuition is very simple. 1. create a Stringbuilder str 2. loop through the address string ...

**Question 699. Kth Smallest Element in a BST Leetcode Solution** Problem Statement Kth Smallest Element in a BST Leetcode Solution – Given the root of a binary search tree, and an integer k, return the kth smallest value (1-indexed) of all the values of the nodes in the tree. Examples: Input: root = [3,1,4,null,2], k = 1 Output: 1 Input: root = [5,3,6,2,4,null,null,1], k ...

**Question 700. Find Leaves of Binary Tree LeetCode Solution** Problem Statement Find Leaves of Binary Tree LeetCode Solution – Given the root of a binary tree, collect a tree’s nodes as if you were doing this: Collect all the leaf nodes. Remove all the leaf nodes. Repeat until the tree is empty. Example Test Case 1: Input: root = [1, 2, 3, ...

**Question 701. Top K Frequent Words LeetCode Solution** Problem Statement Top K Frequent Words LeetCode Solution – Given an array of strings words and an integer k, return the k most frequent strings. Return the answer sorted by the frequency from highest to lowest. Sort the words with the same frequency by their lexicographical order. Example Test Case 1: Input: words = [“i”,”love”,”leetcode”,”i”,”love”,”coding”] k = 2 Output: [“i”,”love”] Explanation ...

**Question 702. Increasing Triplet Subsequence LeetCode Solution** Problem Statement : Increasing Triplet Subsequence LeetCode Solution – Given an integer array nums, return true if there exists a triple of indices (i, j, k) such that i < j < k and nums[i] < nums[j] < nums[k]. If no such indices exists, return false. Example : Example 1: Input: nums = [2,1,5,0,4,6] Output: true Explanation: The ...

**Question 703. Merge Sorted Array LeetCode Solution** Problem Statement Merge Sorted Array LeetCode Solution – You are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and nums2 respectively. Merge nums1 and nums2 into a single array sorted in non-decreasing order. The final sorted array should not be returned by the function, but instead be stored inside the array nums1. ...

**Question 704. Employee Free Time LeetCode Solution** Problem Statement Employee Free Time LeetCode Solution – We are given a list schedule of employees, which represents the working time for each employee. Each employee has a list of non-overlapping Intervals, and these intervals are in sorted order. Return the list of finite intervals representing the common, positive-length free time for all employees, also in ...

**Question 705. Minimum Possible Integer After at Most K Adjacent Swaps On Digits LeetCode Solution** Problem Statement Minimum Possible Integer After at Most K Adjacent Swaps On Digits LeetCode Solution – You are given a string num representing the digits of a very large integer and an integer k. You are allowed to swap any two adjacent digits of the integer at most k times. Return the minimum integer you can obtain also ...

**Question 706. Swapping Nodes in a Linked List Leetcode Solution** Problem Statement Swapping Nodes in a Linked List Leetcode Solution – You are given the head of a linked list, and an integer k.Return the head of the linked list after swapping the values of the kth node from the beginning and the kth node from the end (the list is 1-indexed). Example: Input: head = [1,2,3,4,5], k = 2 ...

**Question 707. Find Minimum in Rotated Sorted Array II LeetCode Solution** Problem Statement Find Minimum in Rotated Sorted Array II LeetCode Solution – Suppose an array of length n sorted in ascending order is rotated between 1 and n times. For example, the array nums = [0,1,4,4,5,6,7] might become: [4,5,6,7,0,1,4] if it was rotated 4 times. [0,1,4,4,5,6,7] if it was rotated 7 times. Notice that rotating an array [a[0], a[1], a[2], ..., a[n-1]] 1 time results in the array [a[n-1], a[0], a[1], a[2], ...

**Question 708. Delete Node in a Linked List Leetcode Solution** Problem Statement : Delete Node in a Linked List Leetcode Solution – Write a function to delete a node in a singly-linked list. You will not be given access to the head of the list, instead, you will be given access to the node to be deleted directly. It is guaranteed that the node to be deleted is not ...

**Question 709. Number of Distinct Islands Leetcode Solution** Problem Statement The Number of Distinct Islands LeetCode Solution – “Number of Distinct Islands” states that given a n x m binary matrix. An island is a group of 1‘s (representing land) connected 4-directionally (horizontal or vertical). An island is considered to be the same as another if and only if one island ...

**Question 710. Find if Path Exists in Graph Leetcode Solution** Problem Statement Find if Path Exists in Graph Leetcode Solution – There is a bi-directional graph with n vertices, where each vertex is labeled from 0 to n - 1 (inclusive). The edges in the graph are represented as a 2D integer array edges, where each edges[i] = [ui, vi] denotes a bi-directional edge between vertex ui and vertex vi. Every vertex pair ...

**Question 711. Closest Leaf in a Binary Tree LeetCode Solution** Problem Statement Closest Leaf in a Binary Tree LeetCode Solution – Given the root of a binary tree where every node has a unique value and a target integer k, return the value of the nearest leaf node to the target k in the tree. Nearest to a leaf means the least number of edges traveled on the binary tree to ...

**Question 712. Ugly Number II LeetCode Solution** Problem Statement Ugly Number II LeetCode Solution – An ugly number is a positive integer whose prime factors are limited to 2, 3, and 5. Given an integer n, return the nth ugly number. Input: n = 10 Output: 12 Explanation: [1, 2, 3, 4, 5, 6, 8, 9, 10, 12] is the sequence of the first 10 ...

**Question 713. Invalid Transactions LeetCode Solution** Problem Statement Invalid Transactions LeetCode Solution – A transaction is possibly invalid if: the amount exceeds $1000, or; if it occurs within (and including) 60 minutes of another transaction with the same name in a different city. You are given an array of strings transaction where transactions[i] consists of comma-separated values representing the name, time (in minutes), amount, and city ...

**Question 714. Combination Sum IV LeetCode Solution** Problem Statement Combination Sum IV LeetCode Solution – Given an array of distinct integers nums and a target integer target, return the number of possible combinations that add up to target. The test cases are generated so that the answer can fit in a 32-bit integer. Input: nums = [1,2,3], target = 4 Output: 7 Explanation: The possible ...

**Question 715. String to Integer (atoi) LeetCode Solution** Problem Statement The String to Integer (atoi) Leetcode Solution -“String to Integer (atoi)” states that Implementing the myAtoi(string s) function, which converts a string to a 32-bit signed integer (similar to C/C++’s atoi function). The algorithm for myAtoi(string s) is as follows: Read in and ignore any leading whitespace. Check if the next character (if ...

**Question 716. Restore IP Addresses Leetcode Solution** Problem Statement The Restore IP Addresses LeetCode Solution – “Restore IP Addresses” states that given the string which contains only digits, we need to return all possible valid IP Addresses in any order that can be formed by inserting dots into the string. Note that we’re not allowed to return ...

**Question 717. String Compression LeetCode Solution** Problem Statement String Compression LeetCode Solution – Given an array of characters chars, compress it using the following algorithm: Begin with an empty string s. For each group of consecutive repeating characters in chars: If the group’s length is 1, append the character to s. Otherwise, append the character followed by the group’s length. The compressed string ...

**Question 718. Minimum Swaps To Make Sequences Increasing LeetCode Solution** Problem Statement Minimum Swaps To Make Sequences Increasing LeetCode Solution – You are given two integer arrays of the same length nums1 and nums2. In one operation, you are allowed to swap nums1[i] with nums2[i]. For example, if nums1 = [1,2,3,8], and nums2 = [5,6,7,4], you can swap the element at i = 3 to obtain nums1 = [1,2,3,4] and nums2 = [5,6,7,8]. ...

**Question 719. Check Completeness of a Binary Tree LeetCode Solution** Problem Statement Check Completeness of a Binary Tree LeetCode Solution – Given the root of a binary tree, determine if it is a complete binary tree. In a complete binary tree, every level, except possibly the last, is completely filled, and all nodes in the last level are as far left as possible. ...

**Question 720. Graph Valid Tree LeetCode Solution** Problem Statement Graph Valid Tree LeetCode Solution – Given the edges of a graph, check if the edges make up a valid tree. If yes, return true and false otherwise. The edges are given as a 2D array of size n*2 Examples & Explanations Example 1: Input: n = 5, ...

**Question 721. Spiral Matrix II Leetcode Solution** Problem Statement This question Spiral Matrix II is very similar to Spiral Matrix Please try to attempt the above question to get a better idea before solving this problem. In this question, we are asked to generate a matrix of size n*n having elements in spiral order, and only n ...

**Question 722. Web Crawler LeetCode Solution** Problem Statement Web Crawler LeetCode Solution – Given a URL startUrl and an interface HtmlParser, implement a web crawler to crawl all links that are under the same hostname as startUrl. Return all URLs obtained by your web crawler in any order. Your crawler should: Start from the page: startUrl Call HtmlParser.getUrls(url) to get all URLs from a webpage of ...

**Question 723. One Edit Distance LeetCode Solution** Problem Statement One Edit Distance LeetCode Solution – Given two strings s and t, return true if they are both one edit distance apart, otherwise return false. A string s is said to be one distance apart from a string t if you can: Insert exactly one character into s to get t. Delete exactly one character from s to get t. Replace exactly one character of s with a different character to get t. Input: ...

**Question 724. Possible Bipartition LeetCode Solution** Problem Statement Possible Bipartition LeetCode Solution – We want to split a group of n people (labeled from 1 to n) into two groups of any size. Each person may dislike some other people, and they should not go into the same group. Given the integer n and the array dislikes where dislikes[i] = [ai, bi] indicates that the person labeled ai does ...

**Question 725. Employee Importance LeetCode Solution** Problem Statement Employee Importance LeetCode Solution – You have a data structure of employee information, including the employee’s unique ID, importance value, and direct subordinates’ IDs. You are given an array of employees employees where: employees[i].id is the ID of the ith employee. employees[i].importance is the important value of the ith employee. employees[i].subordinates is a list of the ...

**Question 726. Integer Break LeetCode Solution** Problem Statement Integer Break LeetCode Solution – Given an integer n, break it into the sum of k positive integers, where k >= 2, and maximize the product of those integers. We need to Return the maximum product we can get. Input: n = 2 Output: 1 Explanation: 2 = 1 + 1, ...

**Question 727. Kth Smallest Product of Two Sorted Arrays LeetCode Solution** Problem Statement Kth Smallest Product of Two Sorted Arrays LeetCode Solution – Given two sorted 0-indexed integer arrays nums1 and nums2 as well as an integer k, return the kth (1-based) smallest product of nums1[i] * nums2[j] where 0 <= i < nums1.length and 0 <= j < nums2.length. Input: nums1 = [2,5], nums2 = [3,4], k = 2 Output: 8 Explanation: The 2 ...

**Question 728. Kill Process LeetCode Solution** Problem Statement Kill Process LeetCode Solution – You have n processes forming a rooted tree structure. You are given two integer arrays pid and ppid, where pid[i] is the ID of the ith process and ppid[i] is the ID of the ith process’s parent process. Each process has only one parent process but may have multiple children processes. Only one process has ppid[i] = 0, ...

**Question 729. Path With Maximum Minimum Value LeetCode Solution** Problem Statement Path With Maximum Minimum Value LeetCode Solution – Given an m x n integer matrix grid, return the maximum score of a path starting at (0, 0) and ending at (m - 1, n - 1) moving in the 4 cardinal directions. The score of a path is the minimum value in that path. For example, the score of ...

**Question 730. Maximum Product of Splitted Binary Tree LeetCode Solution** Problem Statement Maximum Product of Splitted Binary Tree LeetCode Solution – Given the root of a binary tree, split the binary tree into two subtrees by removing one edge such that the product of the sums of the subtrees is maximized. Return the maximum product of the sums of the two subtrees. ...

**Question 731. Symmetric Tree LeetCode Solution Leetcode Solution** Problem Statement The Symmetric Tree LeetCode Solution – “Symmetric Tree” states that given the root of the binary tree and we need to check if the given binary tree is a mirror of itself(symmetric around its center) or not? If Yes, we need to return true otherwise, false. Example: ...

**Question 732. Design Hit Counter LeetCode Solution** Problem Statement Design Hit Counter LeetCode Solution – Design a hit counter which counts the number of hits received in the past 5 minutes (i.e., the past 300 seconds). Your system should accept a timestamp parameter (in seconds granularity), and you may assume that calls are being made to the system in chronological order (i.e., timestamp is monotonically increasing). ...

**Question 733. Minimum Moves to Equal Array Elements LeetCode Solution** Problem Statement Minimum Moves to Equal Array Elements LeetCode Solution – Given an integer array nums of size n, return the minimum number of moves required to make all array elements equal. In one move, you can increment n - 1 elements of the array by 1. Example 1: Input 1: nums = [1, 2, 3] Output: ...

**Question 734. Jump Game Leetcode Solution** Problem Statement Jump Game Leetcode Solution – You are given an integer array nums. You are initially positioned at the array’s first index, and each element in the array represents your maximum jump length at that position. Return true if you can reach the last index, or false otherwise. Example: Input 1: nums = [2, ...

**Question 735. Linked List Cycle II LeetCode Solution** Problem Statement Linked List Cycle II LeetCode Solution – Given the head of a linked list, return the node where the cycle begins. If there is no cycle, return null. There is a cycle in a linked list if there is some node in the list that can be reached again by continuously ...

**Question 736. Champagne Tower LeetCode Solution** Problem Statement Champagne Tower LeetCode Solution – We stack glasses in a pyramid, where the first row has 1 glass, the second row has 2 glasses, and so on until the 100th row. Each glass holds one cup of champagne. Then, some champagne is poured into the first glass at the top. When the topmost glass is full, any ...

**Question 737. Bitwise AND of Numbers Range LeetCode Solution** Problem Statement Bitwise AND of Numbers Range LeetCode Solution – Given 2 numbers left and right that represent the range [left, right], we have to find bitwise AND of all the numbers from left to right (both inclusive) Examples & Explanation Example 1: Input: left = 5, right = 7 ...

**Question 738. Word Pattern LeetCode Solution** Problem Statement Word Pattern LeetCode Solution – We are given 2 strings – “s” and “pattern”, we need to find if the pattern follows s. Follows here means full match. More formally, we can for every pattern[i] there should only be one s[i] and vice versa i.e. there is a ...

**Question 739. Maximum Product of Three Numbers LeetCode Solution** Problem Statement Maximum Product of Three Numbers LeetCode Solution – We are given an array, the question asks us to calculate the maximum product of any 3 numbers. Examples Example 1: Input: nums = [1,2,3] Output: 6 Example 2: Input: nums = [1,2,3,4] Output: 24 Example 3: Input: nums = ...

**Question 740. Excel Sheet Column Title LeetCode Solution** Problem Statement Excel Sheet Column Title LeetCode Solution – We are given a column number (let’s call it colNum) and need to return its corresponding column title as it appears in an excel sheet For example A -> 1 B -> 2 C -> 3 … Z -> 26 AA ...

**Question 741. Valid Perfect Square LeetCode Solution** Problem Statement Valid Perfect Square LeetCode Solution – Given a positive integer num, write a function that returns True if num is a perfect square else False. Follow up: Do not use any built-in library function such as sqrt. Input: num = 16 Output: true Explanation A boundary for our solution is fixed. for any number ...

**Question 742. Random Pick Index LeetCode Solution** Problem Statement Random Pick Index LeetCode Solution- We are given a constructor of class “Solution” and a function “pick” of type int. We are required to implement the “Solution” class as Solution(int[] nums) Initializes the object with the array nums. int pick(int target) Picks a random index i from nums where nums[i] == target. If there are multiple ...

**Question 743. Merge Two Binary Trees LeetCode Solution** Problem Statement Merge Two Binary Trees LeetCode Solution – You are given two binary trees root1 and root2. Imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are not. You need to merge the two trees into ...

**Question 744. Subarray Product Less Than K LeetCode Solution** Problem Statement Subarray Product Less Than K LeetCode Solution – Given an array of integers nums and an integer k, return the number of contiguous subarrays where the product of all the elements in the subarray is strictly less than k. Example Test Case 1: Input: inputArr = [10, 5, 2, 6] k = 100 ...

**Question 745. Reverse Only Letters LeetCode Solution** Problem Statement Reverse Only Letters LeetCode Solution – Given a string s, reverse the string according to the following rules: All the characters that are not English letters remain in the same position. All the English letters (lowercase or uppercase) should be reversed. Return s after reversing it. Input: s = "ab-cd" ...

**Question 746. Repeated Substring Pattern LeetCode Solution** Problem Statement Repeated Substring Pattern LeetCode Solution – Given a string s, check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. Input: s = "abab" Output: true Explanation: It is the substring "ab" twice. Explanation The first char of ...

**Question 747. Number of Days Between Two Dates LeetCode Solution** Problem Statement The question Number of Days Between Two Dates LeetCode Solution asks us to calculate the exact number of days between 2 given dates including leap years. The dates are given as strings in the format YYYY-MM-DD. It is also given that the input dates are valid dates between ...

**Question 748. Encoded String With Shortest Length LeetCode Solution** Problem Statement Encoded String With Shortest Length LeetCode Solution – Given a string s, encode the string such that its encoded length is the shortest. The encoding rule is: k[encoded_string], where the encoded_string inside the square brackets is being repeated exactly k times. k should be a positive integer. If an encoding process does not make the ...

**Question 749. Next Greater Element III LeetCode Solution** Problem Statement The problem, Next Greater Element III LeetCode Solution states that you are given a positive integer n and you need to find the next greatest integer using the digits present in n only. If there does not exist any such integer, you need to print -1. Moreover, the new ...

**Question 750. Binary Tree Longest Consecutive Sequence LeetCode Solution** Problem Statement Binary Tree Longest Consecutive Sequence LeetCode Solution – Given the root of a binary tree, return the length of the longest consecutive sequence path. The path refers to any sequence of nodes from some starting node to any node in the tree along with the parent-child connections. The longest consecutive ...

**Question 751. Perfect Squares LeetCode Solution** Problem Statement The Perfect Squares LeetCode Solution – “Perfect Squares” states that given an integer n and you need to return the minimum number of perfect squares whose sum equals to n. Note that the same perfect square can be used multiple times. Example: Input: n = 12 Output: 3 Explanation: ...

**Question 752. Edit Distance LeetCode Solution** Problem Statement The problem Edit Distance LeetCode Solution states that you are given two strings word1 and word2 and you need to convert word1 into word2 in minimum operations. The operations that can be performed on the string are – Insert a character Delete a character Replace a character Examples Test Case ...

**Question 753. Custom Sort String Leetcode Solution** Problem Statement The Custom Sort String LeetCode Solution – “Custom Sort String” states that you’re given two strings order and s. All characters of string order are unique and they are sorted in the custom order. We need to permute the characters of s and such that the characters follow ...

**Question 754. Minimum Cost to Move Chips to The Same Position LeetCode Solution** Problem Statement The Minimum Cost to Move Chips to The Same Position LeetCode Solution – “Minimum Cost to Move Chips to The Same Position” states that you have n chips, where the position of the ith chip is position[i]. You need to move all the chips to the same position. In one step, we ...

**Question 755. Least Number of Unique Integers after K Removals Leetcode Solution** Problem Statement The Least Number of Unique Integers after K Removals LeetCode Solution – “Least Number of Unique Integers after K removals” states that you’re given an array of integers and an integer k. Find the least number of unique integers after removing exactly k elements. Example: Input: arr = [5,5,4], k = 1 Output: 1 Explanation: Since k ...

**Question 756. Remove All Occurrences of a Substring LeetCode Solution** Problem Statement The Remove All Occurrences of a Substring LeetCode Solution –“Remove All Occurrences of a Substring” states that remove ALL the occurrences of the substring part from the given input string s. Note: Substring is a contiguous sequence of characters in an input string. Example Explanation Let’s ...

**Question 757. Find All Duplicates in an Array LeetCode Solution** Problem Statement The problem, Find All Duplicates in an Array LeetCode Solution states that you are given an array of size n containing elements in the range [1,n]. Each integer can appear either once or twice and you need to find all the elements that appear twice in the array. Examples ...

**Question 758. Move Zeroes LeetCode Solution** Problem Statement The problem, Move Zeroes LeetCode Solution states that you are given an array containing zero and non-zero elements and you need to move all the zeroes to the end of the array, maintaining the relative order of non-zero elements in the array. You also need to implement an in-place ...

**Question 759. Single Number Leetcode Solution** Problem Statement Single Number Leetcode Solution – We are given a non-empty array of integers and need to find an element that appears exactly once. It is given in the question that every element appears twice except for one. Example 1: Input: nums = [2,2,1] Output: 1 Example 2: Input: ...

**Question 760. Number of Provinces Leetcode Solution** Problem Statement Number of Provinces Leetcode Solution – We are given an adjacency matrix representation of a graph and need to find the number of provinces. Here province is a group of directly or indirectly connected cities and no other cities outside of the group. Example Example 1: Input: isConnected ...

**Question 761. 01 Matrix LeetCode Solution** Problem Statement In this problem 01 Matrix LeetCode Solution, we need to find the distance of the nearest 0 for each cell of the given matrix. The matrix consists only of 0’s and 1’s and the distance of any two adjacent cells is 1. Examples Example 1: Input: mat = ...

**Question 762. Check If Array Pairs Are Divisible by k LeetCode Solution** Problem Statement Check If Array Pairs Are Divisible by k LeetCode Solution – Given an array of integers of even length n and an integer k. We want to divide the array into exactly n/2 pairs such that the sum of each pair is divisible by k. Return true If ...

**Question 763. Sort Characters By Frequency LeetCode Solution** Problem Statement Sort Characters By Frequency LeetCode Solution – Given a string S, sort it in decreasing order based on the frequency of the characters. The frequency of a character is the number of times it appears in the string. Return the sorted string. If there are multiple answers, return any of them. Example for Sort Characters By ...

**Question 764. Non-decreasing Array LeetCode Solution** Problem Statement Non-decreasing Array LeetCode Solution – given array nums with n integers, your task is to check if it could become non-decreasing by modifying at most one element. We define an array is non-decreasing if nums[index ] <= nums[index +1] holds for every index (0-based) such that (0 <= index <= n-2). ...

**Question 765. Longest Substring with At Most K Distinct Characters LeetCode Solution** Problem Statement Longest Substring with At Most K Distinct Characters LeetCode Solution – Given a string S and an integer K, return the length of the longest substring of S that contains at most K distinct characters. Example: Test Case 1: Input: S = “bacc” K = 2 Output: 3 Test Case 2: Input: S = “ab” ...

**Question 766. Factorial Trailing Zeroes LeetCode Solution** Problem Statement Factorial Trailing Zeroes LeetCode Solution – Given an integer n, return the number of trailing zeroes in n!. Note that n! = n * (n - 1) * (n - 2) * ... * 3 * 2 * 1. Input: n = 3 Output: 0 Explanation: 3! = 6, no trailing ...

**Question 767. Guess Number Higher or Lower LeetCode Solution** Problem Statement Guess Number Higher or Lower LeetCode Solution – We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wrong, I will tell you whether the number I ...

**Question 768. Convert Sorted Array to Binary Search Tree LeetCode Solutions** Problem Statement Convert Sorted Array to Binary Search Tree LeetCode Solutions says given an integer array nums where the elements are sorted in ascending order, convert it to a height-balanced binary search tree. A height-balanced binary tree is a binary tree in which the depth of the two subtrees of every node never differs by more ...

**Question 769. Minimum Jumps to Reach Home LeetCode Solution** Problem Statement Minimum Jumps to Reach Home LeetCode Solution says – A certain bug’s home is on the x-axis at position x. Help them get there from position 0. The bug jumps according to the following rules: It can jump exactly a positions forward (to the right). It can jump exactly b positions backward (to the ...

**Question 770. Word Ladder LeetCode Solution** Problem Statement The Word Ladder LeetCode Solution – “Word Ladder” states that you are given a string beginWord, string endWord, and a wordList. We need to find the shortest transformation sequence length (if no path exists, print 0) from beginWord to endWord following the given conditions: All the Intermediate Words should ...

**Question 771. Best Meeting Point LeetCode Solution** Problem Statement The Best Meeting Point LeetCode Solution says Given a binary grid grid of size m x n where each 1 determines the home of one friend, we want to return the minimal total travel distance where the total travel distance is the sum of the distances between the houses of ...

**Question 772. Longest Substring with At Least K Repeating Characters LeetCode Solution** Problem Statement The problem Longest Substring with At Least K Repeating Characters LeetCode Solution says given a string S and an integer k, return the length of the longest substring of S such that the frequency of each character in this substring is greater than or equal to k. Example for Longest Substring with At Least ...

**Question 773. Same Tree LeetCode Solution** Problem Statement The problem Same Tree says Given the roots of two binary trees p and q, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical, and the nodes have the same value. Example: Test Case ...

**Question 774. Kth Smallest Number in Multiplication Table Leetcode Solution** Problem Statement The Kth Smallest Number in Multiplication Table Solution – states that you are given the multiplication table matrix of size m x n, where matrix[i][j] = i*j (1 indexed). For the given three integers m,n and k, we need to find the kth smallest element in the m ...

**Question 775. Last Stone Weight II LeetCode Solution** Problem Statement The problem Last Stone Weight II says you are given an array of integers stones where stones[i] is the weight of the ith stone. We are playing a game with the stones. On each turn, we choose any two stones and smash them together. Suppose the stones have weights x and y ...

**Question 776. Spiral Matrix LeetCode Solution** Problem Statement Spiral Matrix Problem says In Spiral Matrix we want to print all the elements of a matrix in a spiral form in the clockwise direction. Approach for Spiral Matrix: Idea The problem can be implemented by dividing the matrix into loops and printing all the elements in each ...

**Question 777. Sum of Subarray Ranges Leetcode Solution** Problem Statement The Sum of Subarray Ranges Leetcode Solution – says that you’re given an integer array nums of max size 10^3. We need to return the sum of all subarray ranges of the given array. The range of a subarray is defined as the difference between the largest and smallest ...

**Question 778. Remove Duplicates from Sorted Array Leetcode Solution** Problem Statement The Remove Duplicates from Sorted Array Leetcode Solution – says that you’re given an integer array sorted in non-decreasing order. We need to remove all duplicate elements and modify the original array such that the relative order of distinct elements remains the same and, report the value of ...

**Question 779. Largest BST Subtree LeetCode Solution** Problem Statement The Largest BST Subtree LeetCode Solution problem says given the root of a binary tree, find the largest subtree, which is also a Binary Search Tree (BST), where the largest means subtree having the largest number of nodes. Note: A subtree must include all of its descendants. In a Binary ...

**Question 780. My Calendar I LeetCode Solution** Problem Statement My Calendar I LeetCode Solution – We need to write a program that can be used as a Calendar. We can add a new event if adding the event will not cause a double booking. A double booking happens when two events have some non-empty intersection (i.e., some moment is ...

**Question 781. Sort Array By Parity LeetCode Solution** Problem Statement The Sort Array By Parity LeetCode Solution – “Sort Array By Parity” states that you are given an integer array nums, move all the even integers at the beginning of the array followed by all the odd integers. Note: Return any array that satisfies this condition. Example: Input: Output: ...

**Question 782. Remove Nth Node From End of List Leetcode Solution** Problem Statement The Remove Nth Node From End of List Leetcode Solution – states that you are given the head of a linked list and you need to remove the nth node from the end of this list. After deleting this node, return the head of the modified list. Example: Input: ...

**Question 783. Meeting Rooms II LeetCode Solution** Problem Statement The Meeting Rooms II LeetCode Solution – “Meeting Rooms II” states that you are given an array of meeting time intervals “intervals” where “intervals[i] = [ start[i], end[i] ]”, return the minimum number of conference rooms required. Example: intervals = [[0,30],[5,10],[15,20]] 2 Explanation: Meeting one can be done ...

**Question 784. Subarray Sum Equals K LeetCode Solution** Problem Statement The Subarray Sum Equals K LeetCode Solution – “Subarray Sum Equals K” states that you are given an array of integers “nums” and an integer ‘k’, return the total number of continuous subarrays whose sum equals to ‘k’. Example: nums = [1, 2, 3], k=3 2 Explanation: There ...

**Question 785. Longest Palindromic Substring LeetCode Solution** Problem Statement The Longest Palindromic Substring LeetCode Solution – “Longest Palindromic Substring” states that You are Given a string s, return the longest palindromic substring in s. Note: A palindrome is a word that reads the same backward as forwards, e.g. madam. Example: s = "babad" "bab" Explanation: All ...

**Question 786. Best Time to Buy and Sell Stock LeetCode Solution** Problem Statement The Best Time to Buy and Sell Stock LeetCode Solution – “Best Time to Buy and Sell Stock” states that You are given an array of prices where prices[i] is the price of a given stock on an ith day. You want to maximize your profit by choosing ...

**Question 787. Median of Two Sorted Arrays LeetCode Solution** Problem statement Median of Two Sorted Arrays LeetCode solution – In the problem “Median of Two Sorted Arrays”, we are given two sorted arrays nums1 and nums2 of size m and n respectively, and we have to return the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). Example nums1 = [1,3], ...

**Question 788. Number of Islands LeetCode Solution** Problem Statement The number of Islands LeetCode Solution – “Number of Islands” states that you are given an m x n 2D binary grid which represents a map of ‘1’s (land) and ‘0’s (water), you have to return the number of islands. An island is surrounded by water and is ...

**Question 789. LRU Cache LeetCode Solution** Question Design a data structure that follows the constraints of a Least Recently Used (LRU) cache. Implement the LRUCache class: LRUCache(int capacity) Initialize the LRU cache with positive size capacity. int get(int key) Return the value of the key if the key exists, otherwise return -1. void put(int key, int value) Update the value of the key if the key exists. Otherwise, add the key-value pair to ...

**Question 790. Kth Largest Element in a Stream Leetcode Solution** Problem Statement In this problem, we have to design a class KthLargest() that initially has an integer k and an array of integers. We need to write a parameterized constructor for it when an integer k and array nums are passed as arguments. The class also has a function add(val) that adds ...

**Question 791. Remove Linked List Elements Leetcode Solution** Problem Statement In this problem, we are given a linked list with its nodes having integer values. We need to delete some nodes from the list which have value equal to val. The problem does not require to be solved in-place but we will discuss one such approach. Example List = ...

**Question 792. Minimum Moves to Equal Array Elements Leetcode Solution** Problem Statement In this problem, we are given an array of integers. Also, we are allowed to perform a certain set of operations on this array. In one operation, we can increment ” n – 1″ (all elements except any one) elements in the array by 1. We need to ...

**Question 793. Hamming Distance Leetcode Solution** Problem Statement In this problem, we are given two integers, A and B, and the goal is to find the hamming distance between the given integers. The integers are greater that/equal to 0 and less than 231 Example First Integer = 5 , Second Integer = 2 3 First Integer ...

**Question 794. Count Good Nodes in Binary Tree Leetcode Solution** Problem Statement In this problem a binary tree is given with its root. A node X in the tree is named good if in the path from root to X there are no nodes with a value greater than X. We have to return the number of good nodes in ...

**Question 795. Number of Steps to Reduce a Number to Zero Leetcode Solution** The problem Number of Steps to Reduce a Number to Zero Leetcode Solution states that given an integer. Find the minimum number of steps to convert the given integer to 0. You can perform either of the two steps, either subtract 1 or divide the integer by 2. The problem ...

**Question 796. Design Parking System Leetcode Solution** Problem Statement In this problem, we have to design a parking lot. We have 3 kinds of parking spaces (big, medium and small). All these parking spaces has some fixed number of empty slots initially. Like, in big type of space, we can place at most b cars. In small ...

**Question 797. Combinations Leetcode Solution** The problem Combinations Leetcode Solution provides us with two integers, n, and k. We are told to generate all the sequences that have k elements picked out of n elements from 1 to n. We return these sequences as an array. Let us go through a few examples to get ...

**Question 798. Intersection of Two Arrays II Leetcode Solution** Problem Statement In this problem two arrays are given and we have to find out the intersection of this two arrays and return the resultant array. Each element in the result should appear as many times as it shows in both arrays. The result can be in any order. Example ...

**Question 799. Jewels and Stones Leetcode Solution** The problem Jewels and Stones Leetcode Solution states that you are given two strings. One of them represents jewels and one of them represents stones. The string that contains jewels represents the characters that are jewels. We need to find the number of characters in the stones string that are ...

**Question 800. Assign Cookies Leetcode Solution** The problem Assign cookies Leetcode Solution provides with two arrays. One of the arrays represents the size of the cookies and the other represents the greediness of the children. The problem states that you are the parent of children, and you want the maximum number of children to be content. ...

**Question 801. Majority Element Leetcode Solution** Problem Statement We are given an array of integers. We need to return the integer which occurs more than ⌊N / 2⌋ time in the array where ⌊ ⌋ is the floor operator. This element is called the majority element. Note that the input array always contains a majority element. ...

**Question 802. Palindrome Linked List Leetcode Solution** In the problem “Palindrome Linked List”, we have to check whether a given singly integer linked list is a palindrome or not. Example List = {1 -> 2 -> 3 -> 2 -> 1} true Explanation #1: The list is palindrome as all elements from the start and back are ...

**Question 803. Maximum Depth of Binary Tree Leetcode Solution** Problem Statement In the problem a binary tree is given and we have to find out the maximum depth of the given tree. A binary tree’s maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Example 3 / ...

**Question 804. Maximum Depth of N-ary Tree Leetcode Solution** In this problem, we are given an N-ary tree, that is, a tree that allows nodes to have more than 2 children. We need to find the depth of a leaf farthest from the root of the tree. This is called maximum depth. Note that the depth of a path ...

**Question 805. Rotate List Leetcode Solution** The problem Rotate List Leetcode Solution provides us a linked list and an integer. We are told to rotate the linked list to the right by k places. So if we rotate a linked list k places to the right, in each step we take the last element from the ...

**Question 806. Pow(x, n) Leetcode Solution** The problem “Pow(x, n) Leetcode Solution” states that you are given two numbers, one of which is a floating-point number and another an integer. The integer denotes the exponent and the base is the floating-point number. We are told to find the value after evaluating the exponent over the base. ...

**Question 807. Find the Difference Leetcode Solution** Problem statement In the problem “Find the Difference” we are given two strings s and t. String t is produced by randomly stuffing the characters of string s and adding one character at a random position. our task is to find out the character which was added in string t. ...

**Question 808. Insert into a Binary Search Tree Leetcode Solution** In this problem, we are given the root node of a Binary Search Tree containing integer values and an integer value of a node that we have to add in the Binary Search Tree and return its structure. After inserting the element into the BST, we have to print its ...

**Question 809. Merge Two Sorted Lists Leetcode Solutions** Linked lists are quite like arrays in their linear properties. We can merge two sorted arrays to form an overall sorted array. In this problem, we have to merge two sorted linked lists in place to return a new list which contains elements of both lists in a sorted fashion. Example ...

**Question 810. Permutations Leetcode Solution** The problem Permutations Leetcode Solution provides a simple sequence of integers and asks us to return a complete vector or array of all the permutations of the given sequence. So, before going into solving the problem. We should be familiar with permutations. So, a permutation is nothing but an arrangement ...

**Question 811. Minimum Depth of Binary Tree Leetcode Solution** In this problem, we need to find the length of the shortest path from the root to any leaf in a given binary tree. Note that the “length of the path” here means the number of nodes from the root node to the leaf node. This length is called Minimum ...

**Question 812. Count Primes Leetcode Solutions** In this problem, we are given an integer, N. The goal is to count how numbers less than N, are primes. The integer is constrained to be non-negative. Example 7 3 10 4 Explanation Primes less than 10 are 2, 3, 5 and 7. So, the count is 4. Approach(Brute ...

**Question 813. House Robber II Leetcode Solution** In the “House Robber II” problem, a robber wants to rob money from different houses. The amount of money in the houses is represented through an array. We need to find the maximum sum of money that can be made by adding the elements in a given array according to ...

**Question 814. Sqrt(x) Leetcode Solution** As the title says, we need to find the square root of a number. Let say the number is x, then Sqrt(x) is a number such that Sqrt(x) * Sqrt(x) = x. If the square root of a number is some decimal value, then we have to return the floor value of ...

**Question 815. Convert Sorted Array to Binary Search Tree Leetcode Solution** Consider we are given a sorted array of integers. The goal is to build a Binary Search Tree from this array such that the tree is height-balanced. Note that a tree is said to be height-balanced if the height difference of left and right subtrees of any node in the ...

**Question 816. Swap Nodes in Pairs Leetcode Solutions** The goal of this problem is to swap nodes of a given linked list in pairs, that is, swapping every two adjacent nodes. If we are allowed to swap just the value of the list nodes, the problem would be trivial. So, we are not allowed to modify the node ...

**Question 817. House Robber Leetcode Solution** Problem Statement In this problem there are houses in a street and House robber has to rob these houses. But the problem is that he can’t rob more than one house successively i.e which are adjacent to each other. Given a list of non-negative integers representing the amount of money ...

**Question 818. Happy Number Leetcode Solution** Problem Statement The problem is to check whether a number is happy number or not. A number is said to be happy number if replacing the number by the sum of the squares of its digits, and repeating the process makes the number equal to 1. if it does not ...

**Question 819. Valid Anagrams** In the problem “Valid Anagrams” we have given two strings str1 and str2. Find out that both the strings are anagrams or not. If they are anagrams return true else return false. Example Input: str1 = “abcbac” str2 = “aabbcc” Output: true Explanation: Since str2 can be formed by rearranging ...

**Question 820. Contiguous Array** Given an array consisting of number 0’s and 1’s only. We have to find the length of the longest contiguous sub-array consisting o’s and 1’s equally. Example Input arr = [0,1,0,1,0,0,1] Output 6 Explanation The longest contiguous sub-array is marked in red [0,1,0,1,0,0,1] and its length is 6. Algorithm Set ...

**Question 821. Union and Intersection of two Linked Lists** Given two linked lists, create another two linked lists to get union and intersection of the elements of existing lists. Example Input: List1: 5 → 9 → 10 → 12 → 14 List2: 3 → 5 → 9 → 14 → 21 Output: Intersection_list: 14 → 9 → 5 Union_list: ...

**Question 822. Lemonade Change Leetcode Solution** This post is on Lemonade Change Leetcode Solution Problem statement In the problem ” Lemonade Change” there is a queue of customers. They want to buy lemonade from us which costs 5 rupees. The customers can give us 5 rupees, 10 rupees, or 20 rupees. We want to return the ...

**Question 823. Valid Perfect Square Leetcode Solution** This post is on Valid Perfect Square Leetcode Solution Problem statement In the problem “Valid Perfect Square” we are given a number “num” and we need to check if this number is a perfect square or not. We have to check this without using the built-in sqrt function. If the ...

**Question 824. Round Robin Scheduling** The Round Robin scheduling is very much similar to FCFS. The only difference between RR and FCFS scheduling is, RR is preemptive scheduling whereas FCFS is non-preemptive scheduling. Every process is allocated to CPU in the ready queue for a single time slice. Here, a ready queue is similar to ...

**Question 825. Maximum number of segments of lengths a, b and c** The problem “Maximum number of segments of lengths a, b and c” states that you are given a positive integer N, and you need to find the maximum number of segments of lengths a,b, and c that can be formed using N. Example N = 7 a = 5, b ...

**Question 826. Best Time to Buy and Sell Stock with Cooldown Leetcode Solution** Problem statement In the problem “Best Time to Buy and Sell Stock with Cooldown” we are given an array where each element in the array contains the price of the given stock on that day. There is no restriction on the number of transactions. The definition of the transaction is ...

**Question 827. Sequences of given length where every element is more than or equal to twice of previous** The problem “Sequences of given length where every element is more than or equal to twice of previous” provides us with two integers m and n. Here m is the largest number that can exist in the sequence and n is the number of elements that must be present in the ...

**Question 828. Count ways to reach the nth stair using step 1, 2 or 3** The problem “Count ways to reach the nth stair using step 1, 2, or 3” states that you are standing on the ground. Now you need to reach the end of the staircase. So how many ways are there to reach the end if you can jump only 1, 2, ...

**Question 829. Find postorder traversal of BST from preorder traversal** Problem Statement The problem “Find postorder traversal of BST from preorder traversal” states that you are given preorder traversal of a binary search tree. Then using the given input find the postorder traversal. Example preorder traversal sequence: 5 2 1 3 4 7 6 8 9 1 4 3 2 ...

**Question 830. Count even length binary sequences with same sum of first and second half bits** The problem “Count even length binary sequences with same sum of first and second half bits” states that you are given an integer. Now find out the number of ways to construct a binary sequence of size 2*n such that the first half and second half have the same number ...

**Question 831. Print Maximum Length Chain of Pairs** Problem Statement The problem “Print Maximum Length Chain of Pairs” states that you are given some pairs of numbers. It is given that in each pair, the first number is smaller than the second number. Now you need to find the longest chain such that the second number of preceding ...

**Question 832. Print n terms of Newman-Conway Sequence** Problem Statement The problem “Print n terms of Newman-Conway Sequence” states that you are given an integer “n”. Find the first n terms of Newman-Conway Sequence then print them. Example n = 6 1 1 2 2 3 4 Explanation All the terms which are printed follow the Newman-Conway Sequence ...

**Question 833. Remove Duplicates from Sorted List II** The problem “Remove Duplicates from Sorted List II” states that you are given a linked list that may or may not have duplicate elements. If the list has duplicate elements then remove all of their instances from the list. After performing the following operations, print the linked list at the ...

**Question 834. Write a function to get the intersection point of two Linked Lists** Problem Statement The problem “Write a function to get the intersection point of two Linked Lists” states that you are given two linked lists. But they are not independent linked lists. They are connected at some point. Now you need to find this point of intersection of these two lists. ...

**Question 835. Newman-Conway Sequence** Problem Statement The problem “Newman-Conway Sequence” states that you are given an input integer “n”. Then you need to print first nth element of the Newman-Conway Sequence. Example n = 6 4 n = 10 6 Explanation Since the output elements represent the sixth and tenth element of the Newman-Conway ...

**Question 836. Delete Nth node from the end of the given linked list** Problem Statement The problem “Delete Nth node from the end of the given linked list” states that you are given a linked list with some nodes. And now you need to remove nth node from the end of the linked list. Example 2->3->4->5->6->7 delete 3rd node from last 2->3->4->6->7 Explanation: ...

**Question 837. Print Fibonacci sequence using 2 variables** Problem Statement The problem “Print Fibonacci sequence using 2 variables” states that you need to print the Fibonacci sequence but there is a limitation of using only 2 variables. Example n = 5 0 1 1 2 3 5 Explanation The output sequence has the first five elements of the ...

**Question 838. Cutting a Rod** Problem Statement The problem “Cutting a Rod” states that you are given a rod of some particular length and prices for all sizes of rods which are smaller than or equal to the input length. That is we know the price for rods of length from 1 to n, considering ...

**Question 839. Largest divisible pairs subset** Problem Statement The problem “Largest divisible pairs subset” states that you are given an array of n distinct elements. Find the length of largest such that each pair of the subset has the larger element divisible by smaller elements. Example array = {1, 2, 4, 5, 8, 9, 16} 5 ...

**Question 840. Check if any two intervals overlap among a given set of intervals** Problem Statement The problem “Check if any two intervals overlap among a given set of intervals” states that you are given some set of intervals. Each interval consists of two values, one is starting time and the other is ending time. The problem statement asks to check if any of ...

**Question 841. Friends Pairing Problem** Problem Statement The “Friends Pairing Problem” states that there are N friends. And each them can remain single or be paired up with each other. But once a pair is made, those two friends can not take part in pairing. So, you need to find the total number of ways ...

**Question 842. Happy Number** Problem Statement What is a happy number? A number is a happy number if we can reduce a given number to 1 following this process: -> Find the sum of the square of the digits of the given number. Replace this sum with the old number. We will repeat this ...

**Question 843. Palindrome Number** Problem Statement the problem “Palindrome Number” states that you are given an integer number. Check if it is a palindrome or not. Solve this problem without converting the given number into a string. Example 12321 true Explanation 12321 is a palindrome number because when we reverse 12321 it gives 12321 ...

**Question 844. Tiling Problem** Problem Statement The “Tiling Problem” states that you have a grid of size 2 x N and a tile of size 2 x 1. So, find the number of ways to tile the given grid. Example 3 2 Explanation: Approach for Tiling Problem We can solve this problem by using recursion. ...

**Question 845. Page Replacement Algorithms in Operating Systems** What is Page Replacement? The modern operating systems use paging for memory management and many times there is a need for page replacement. Page replacement is the process of replacing a page that is currently present in the memory with a page that is needed but is not present in ...

**Question 846. Linked List Cycle** Problem Statement “Linked List Cycle” problem states that you are given a linked list. Find if it contains any loop or not? Linked list with cycle Example 1->2->3 No Loop Explanation: The linked list does not contain any loop because if it did then there would’ve been two no des ...

**Question 847. Boolean Parenthesization Problem** Problem Statement “ Boolean Parenthesization Problem ” states that we are given a sequence of true and false, and some boolean operators( AND, OR, XOR) in between them. We need to find the number of ways to parenthesize the given sequence such that the entire sequence results in TRUE. In ...

**Question 848. Count pairs from two linked lists whose sum is equal to a given value** Problem Statement Problem “Count pairs from two linked lists whose sum is equal to a given value” state that you are given two linked lists and an integer value sum. The problem statement asked to find out how many total pair has a sum equal to the given value. Example ...

**Question 849. How to print maximum number of A’s using given four keys** Problem Statement How to print maximum number of A’s using given four keys, this problem states that you have the option to choose which key to press. The keys perform the following tasks: Key1 – Prints ‘A’ on screen Key2 – Select the whole screen. Key3 – Copy the selected ...

**Question 850. Count items common to both the lists but with different prices** Problem Statement You are given two lists. Each of which index contains the name of the item and its price. The problem statement asks to count items common to both the lists but with different prices, which is to find out how many numbers of items are common in both ...

**Question 851. A Space Optimized DP solution for 0-1 Knapsack Problem** Problem Statement We are given a knapsack which can hold some weight, we need to pick some of the items out of given items with some value. The items should be picked such that the value of the knapsack ( total value of picked up items ) should be maximized. ...

**Question 852. Minimum number of jumps to reach end** Problem Statement Suppose you have an array of integers and each element of an array indicates each number as maximum jumps that can be taken from that point. Your task is to find out the minimum number of jumps to reach end, i.e. minimum of jumps that can be taken ...

**Question 853. Huffman Coding** We have a message that we want to deliver. We want the message to be of least size possible so that the costs incurred in sending the message is low. Here we use the Huffman Coding concept to reduce the size of the message. Let’s assume that we have the ...

**Question 854. Data Structure Designing** Listening to Data Structure Designing, A lot of people might want to run away looking at the title itself. Those who know me know that I am not leaving until I explain the concept entirely. Embark with me on a journey to learn a problem and a few ideas on ...

**Question 855. Longest Increasing Subsequence** We are provided with an array of integers that is unsorted and we have to find the longest increasing subsequence. The subsequence need not be consecutive The subsequence shall be increasing Let’s understand that better by a few examples. Example Input [9, 2, 5, 3, 7, 10, 8] Output 4 ...

**Question 856. K-th Distinct Element in an Array** You are given an integer array A, print k-th distinct element in an array. The given array may contain duplicates and the output should print k-th distinct element among all unique elements in an array. If k is more than a number of distinct elements, then report it. Example Input: ...

**Question 857. Swap Nodes In Pairs** In swap nodes in pairs problem, we have given a linked list consisting of n nodes. Swap every node at even index with it’s a right adjacent node at odd index() considering index starting from 0. Example Input : 1->2->3->4->NULL Output : 2->1->4->3->NULL Input : 1->2->3->4->5->6->7->NULL Output : 2->1->4->3->6->5->7->NULL Iterative Method Algorithm Create a ...

**Question 858. Intersection of Two Arrays** In intersection of two arrays problem, we have given two arrays, we need to print their intersection(common elements). Example Input arr1[] = {1, 2, 2, 1} arr2[] = {2, 2} Output {2, 2} Input arr1 = {4, 9, 5} arr2 = {9, 4, 9, 8, 4} Output {4, 9} Algorithm ...

**Question 859. Leetcode Permutations** In this leetcode problem premutation we have given an array of distinct integers, print all of its possible permutations. Examples Input arr[] = {1, 2, 3} Output 1 2 3 1 3 2 2 1 3 2 3 1 3 1 2 3 2 1 Input arr[] = {1, 2, ...

**Question 860. Sudoku Solver** In the sudoku solver problem we have given a partially filled (9 x 9) sudoku, write a program to complete the puzzle. Sudoku must satisfy the following properties, Every number(1-9) must appear exactly once in a row and once in a column. Every number(1-9) must appear exactly once in a ...

**Question 861. MiniMax Algorithm** Everyone might be wondering. Argh, another new MINIMAX ALGORITHM. Why do we need it? Let’s know to play a game of chess or tic-tac-toe we have often wondered if there was an algorithm to win the game. Explanation A lot of times we might have wondered if It was possible to ...

**Question 862. Target Sum** “Target Sum” is a special problem for all the DPHolics I have with me today. There ain’t no need to worry I am going to abandon the rest of my lovely readers. We all have gone through the classic KnapSack problem where we try to find the maximum number of ...

**Question 863. Counting Bits** All about Counting Bits! Humans have a problem communicating with the computers they made. Why? Humans speak and understand the language they have come to speak and listen to over the years but they taught the poor computer 0’s and 1’s. So today, Let’s teach our computer to count the ...

**Question 864. Merge K Sorted Linked Lists** Merge K sorted linked lists problem is so famous as per the interview point of view. This question asks so many times in big companies like Google, Microsoft, Amazon, etc. As the name suggests we’ve been provided with k sorted linked lists. We have to merge them together into a ...

**Question 865. OSI Model** This model was developed in 1983 by the International Standards Organization (ISO). This was the first step taken to standardized the international protocols used in various layers. As it deals with connecting open systems, that is, systems that are open for communication with other systems, the model is called the ...

**Question 866. Nth Catalan Number** In the Nth Catalan number problem, we have given an integer n. Find the first n Catalan numbers. Catalan numbers are a series of positive integers which is seen in many counting problems. They are used to count – BSTs (Binary search trees) with n keys. Certain types of lattice ...

**Question 867. Merge Two Sorted Linked Lists** In merge two sorted linked lists we have given head pointer of two linked lists, merge them such that a single linked list is obtained which has nodes with values in sorted order. return the head pointer of the merged linked list. Note: merge the linked list in-place without using ...

**Question 868. Find Median from data Stream** In Find Median from the data Stream problem, we have given that integers are being read from a data stream. Find the median of all the elements read so far starting from the first integer till the last integer. Example Input 1: stream[ ] = {3,10,5,20,7,6} Output : 3 6.5 ...

**Question 869. House Robber** The House Robber Problem states that, in a neighborhood in a city, there is a single row of n houses. A thief is planning to carry a heist in this neighborhood. He knows how much gold is concealed in each of the houses. However, in order to avoid triggering an ...

**Question 870. Sliding Window Maximum** In Sliding Window Maximum problem we have given an array nums, for each contiguous window of size k, find the maximum element in the window. Example Input nums[] = {1,3,-1,-3,5,3,6,7} k = 3 Output {3,3,5,5,6,7} Explanation Naive Approach for Sliding Window Maximum For every contiguous window of size k, traverse ...

**Question 871. Word Break** Word Break is a problem that beautifully illustrates a whole new concept. We have all heard of compound words. Words made up of more than two words. Today we have a list of words and all we’ve got to do is check if all the words from the dictionary can ...

**Question 872. Hamming Distance** What is Hamming Distance? Hamming distance is Technically defined as the number of bits in the same position that differs in two numbers. Let us delve into a new way of finding the distance between two numbers. Example Input To find the hamming distance between 4 and 14 4 and ...

**Question 873. First Bad Version** We all have heard the saying “Bad Apple Ruins The Bunch”.First Bad Version is a problem that beautifully illustrates the same. Today we have a problem which is First Bad Version. One of the interns has made an nth bad commit due to which commits from n+1 have all been ...

**Question 874. Kruskal Algorithm** What is Kruskal Algorithm? Kruskal’s algorithm is used to find the minimum spanning tree(MST) of a connected and undirected graph. Example Graph Minimum Spanning Tree(MST) Algorithm Kruskal’s algorithm is a greedy algorithm to find the minimum spanning tree. Sort the edges in ascending order according to their weights. At every ...

**Question 875. Merge Two Sorted Lists Leetcode** What is merge two sorted lists problem on leetcode? This is so interesting question asked so many times in compnies like Amazon, Oracle, Microsoft, etc. In this problem(Merge Two Sorted Lists Leetcode), we have given two linked lists. Both linked lists are in increasing order. Merge both linked list in ...

**Question 876. Reverse Nodes in K-Group** Problem In Reverse Nodes in K-Group problem we have given a linked list, Reverse the linked list in a group of k and return the modified list. If the nodes are not multiple of k then reverse the remaining nodes. The value of k is always smaller or equal to ...

**Question 877. LRU Cache Implementation** Least Recently Used (LRU) Cache is a type of method which is used to maintain the data such that the time required to use the data is the minimum possible. LRU algorithm used when the cache is full. We remove the least recently used data from the cache memory of ...

**Question 878. Merge Sort** What is merge sort? Merge Sort is a Recursive Procedure. It is also a divide and conquers algorithm. Now we need to know what divide and conquer algorithm is? It’s a type of procedure in which we divide the problem into subproblems and divide them until we find the shortest ...

**Question 879. Valid Sudoku** Valid Sudoku is a problem in which we have given a 9*9 Sudoku board. We need to find the given Sudoku is valid or not on the basis of the following rules: Each row must contain the digits 1-9 without repetition. Each column must contain the digits 1-9 without repetition. Every of the 9 3x3 sub-boxes ...

**Question 880. Palindrome Partitioning** Palindrome Partitioning is a DP problem. In this problem, Given a string S. Partition S such that every substring of the partition is a palindrome. We need to print the minimum cuts needed for a palindrome partitioning of S. Input Format Only a single line containing string S. Output Format ...

**Question 881. Add two numbers** Add two numbers is a problem in which we have given two non-empty linked list representing a non-negative integer. The digit are store in reverse order and every node must contain only a single digit. Add the two numbers and print the result by using a linked list. Input Format ...

**Question 882. Sieve of Eratosthenes** Sieve of Eratosthenes is an algorithm in which we find out the prime numbers less than N. Here N is an integer value. This is an efficient method to find out the prime numbers to a limit. By using this we can find out the prime numbers till 10000000. Here ...

**Question 883. N queen problem** N queen problem using the concept of Backtracking. Here we place queen such that no queen under attack condition. The attack condition of the queens is if two queens are on the same column, row, and diagonal then they are under attack. Let’s see this by the below figure. Here ...

**Question 884. Alien Dictionary** Alien Dictionary is a type of problem in which we have N-words and they are sorted in alien dictionary order. We need to find the order of the characters. The alien language is also used the lowercase letters but the order of the letters is different. Let’s see how we ...

**Question 885. Last Stone Weight** Last Stone Weight is a problem in which we have a set of stones having some positive weights. Now we perform a task on it till we left 1 stone or no stone. We always pick two stones having the highest weight_value and smash them together. Let’s suppose the weight ...

**Question 886. Climbing stairs** Problem Statement The problem “Climbing stairs” states that you are given a staircase with n stairs. At a time you can either climb one stair or two stairs. How many numbers of ways to reach the top of the staircase? Example 3 3 Explanation There are three ways to climb ...

**Question 887. Serialize and Deserialize Binary Tree** We have given a binary tree containing N number of nodes where each node has some value. We need to serialize and deserialize the binary tree. Serialize The process of storing a tree in a file without disturbing its structure is called serialization. DeserializeSerialize and Deserialize Binary Tree The process ...

**Question 888. Reverse a linked list** Problem Statement The problem “reverse a linked list” states that we are given the head of the linked list. We have to reverse the linked list by changing the links between them and return the head of the reversed linked list. Example 10->20->30->40->NULL NULL<-10<-20<-30<-40 Explanation We have reversed the linked ...

**Question 889. Maximum Length of Chain Pairs** Problem Statement In the maximum length of chain pairs problem we have given n pairs of numbers, find the longest chain in which (c, d) can follow (a, b) if b < c. In the given pairs the first element is always smaller than the second. Example Input [{12, 14}, ...

**Question 890. Find Pair with Given Difference** Problem Statement In the given unsorted array, find the pair of elements in the given array with given difference n. Example Input arr[] = {120, 30, 70, 20, 5, 6}, difference(n) = 40 Output [30, 70] Explanation Here the difference of 30 and 70 is equal to the value of ...

**Question 891. Detect a loop in the Linked List** Problem Statement In the “Detect a loop in the Linked List” problem we have given a linked list. Find whether there is loop or not. If there is a loop in the linked list then some node in the linked list will be pointing to one of the previous nodes ...

**Question 892. Find Nth Node** Problem Statement In the “Find Nth Node” problem we have given a linked list to find the nth node. The program should print the data value in the nth node. N is the input integer index. Example 3 1 2 3 4 5 6 3 Approach Given a linked list ...

**Question 893. Swap Kth Node from beginning with Kth Node from End** Problem Statement In the “Swap Kth Node from beginning with Kth Node from End” problem, we have given a linked list. Swap kth node from beginning_with kth node from the end. We should not swap the values, we should swap pointers. Example 2 1 2 3 4 5 6 1 ...