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Difficulty	Question Title	Company Name	Category
Medium	Rearrange Array such that arr[i] >= arr[j] if i is even and arr[i] <= arr[j] if i is odd and j < i	Adobe Amazon Factset Zoho	array
Medium	Armstrong Number	Oracle VMware
Medium	Scramble String	Amazon Fanatics Samsung	string Dynamic Programming Tree
Easy	Valid Anagrams	Amazon Goldman Sachs Google Microsoft Nagarro	string Hashing
Medium	Contiguous Array	Amazon MakeMyTrip Morgan Stanley Paytm	array Hashing
Medium	Convex Hull Algorithm	Morgan Stanley Samsung	algorithm
Medium	Group Anagrams	Amazon Facebook Google Microsoft	string Hashing
Hard	Integer to English words	Amazon Facebook Microsoft Oracle	string
Medium	Unique Paths II	Amazon VMware	matrix Dynamic Programming
Medium	Maximum Length of Repeated Subarray	Indeed	array Dynamic Programming Hashing
Easy	Count pair with Given Sum	Accolite Amazon Factset Hike	array Hashing Sorting
Easy	Minimum Delete Operations to make all Elements of Array Same	Adobe Factset	hashing Array
Medium	Maximum Distance Between two Occurrences of Same Element in Array	Delhivery Factset Fanatics Fourkites	hashing Array
Easy	Group Multiple Occurrence of Array Elements Ordered by first Occurrence	Accolite Adobe Amazon Delhivery Fourkites	hashing Array
Medium	Union and Intersection of two Linked Lists	Accolite Amazon Flipkart Microsoft VMware Walmart Labs	linked-list Sorting
Medium	Maximum difference between frequency of two elements such that element having greater frequency is also greater	Accolite Amazon VMware	array Sorting
Easy	Lemonade Change Leetcode Solution	Amazon Atlassian	LeetCode
Medium	Find the Smallest Divisor given a Threshold Leetcode Solution	AppDynamics Google SAP Walmart Labs	LeetCode
Easy	Maximize Sum of Array after K Negations Leetcode Solution	Amazon	LeetCode Array
Easy	Valid Perfect Square Leetcode Solution	Amazon	LeetCode
Easy	Average Salary Excluding the Minimum and Maximum Salary Leetcode Solution	NetSuite	LeetCode
Hard	Smallest Subarray with k Distinct Numbers	Amazon Google	hashing Array
Medium	All Unique Triplets that Sum up to a Given Value	Accolite Amazon Fanatics	array Hashing
Easy	Longest Subarray Having Count of 1s One More than Count of 0s	Amazon DE Shaw Samsung	array
Medium	Maximum Array from Two given Arrays Keeping Order Same	Amazon Delhivery Factset Fourkites OYO Rooms Publicis Sapient Zoho	array
Medium	Round Robin Scheduling	Amazon Facebook Google Microsoft
Easy	Count Subarrays with Same Even and Odd Elements	Factset Fanatics	array
Hard	Find Smallest Range Containing Elements from k Lists	Amazon Apple Google Uber	dynamic-programming String
Medium	Guess Number Higher or Lower II	Amazon Google Microsoft	dynamic-programming Array
Easy	Rearrange an Array Such that arr[i] is equal to i	Adobe Amazon Fanatics Fourkites Zoho	array
Easy	Segregate 0s and 1s in an Array	Accolite Amazon MakeMyTrip PayPal Paytm Zoho	array
	Find Largest d in Array such that a + b + c = d	Accolite Amazon Delhivery Fanatics Fourkites FreeCharge	hashing Array
	Maximum Number of Chocolates to be Distributed Equally Among k Students	Adobe Amazon Facebook Fourkites	array
Easy	Maximum Consecutive Numbers Present in an Array	Accolite Adobe Amazon Fourkites MAQ	array
Easy	Move all Negative Numbers to Beginning and Positive to End with Constant Extra Space	Capgemini Hike MAQ o9 solutions TCS	array Sorting
Hard	Queries for Number of Distinct Elements in a Subarray	Amazon Google Microsoft Oracle Uber	array Tree
Hard	Queries on Probability of Even or Odd Number in given Ranges	Google Uber	array
Medium	Total Numbers With no Repeated Digits in a Range	Accolite Factset MAQ	array
Hard	Range Minimum Query (Square Root Decomposition and Sparse Table)	Amazon Apple Google	array
Medium	Range Sum Query using Sparse Table	Amazon Publicis Sapient Zoho	array
Hard	Count and Toggle Queries on a Binary Array	Amazon Facebook Google Uber	array
Medium	Queries for Decimal Values of Subarrays of a Binary Array	Amazon Google	array
Medium	Maximize Elements Using Another Array	Amazon Fanatics Fourkites	array Sorting
	Find whether an array is subset of another array	Accolite	array Sorting
Easy	Minimum swaps required to bring all elements less than or equal to k together	Amazon AppDynamics Factset Fourkites Microsoft	hashing Array
	Maximum sum of pairs with specific difference		dynamic-programming
Medium	Find First and Last Position of Element in Sorted Array Leetcode Solution	Amazon Bloomberg ByteDance Facebook Google Microsoft Oracle Uber	LeetCode Array
	Monotonic Array LeetCode Solution		LeetCode
Hard	Smallest Good Base	Google	string
Easy	Find top three repeated in array	MAQ o9 solutions Wipro	hashing Array
	Maximum sum of a path in a Right Number Triangle		dynamic-programming
Medium	Sorting using trivial hash function	Cadence India Capgemini Factset MAQ	hashing Array Sorting
	Maximum number of segments of lengths a, b and c		dynamic-programming
	Maximum subsequence sum such that no three are consecutive		dynamic-programming
	Count all subsequences having product less than K		dynamic-programming
	Core Java Interview Questions
	Find duplicates in a given array when elements are not limited to a range	Adobe Amazon Factset MAQ	hashing Array
Medium	Minimum insertions to form a palindrome with permutations allowed	Amazon Google Indeed Intuit	string Dynamic Programming
	LCS (Longest Common Subsequence) of three strings		dynamic-programming String
Medium	Check if Array Contains Contiguous Integers With Duplicates Allowed	Amazon Facebook Intuit	hashing Array String
Medium	Course Schedule II – LeetCode		LeetCode Breadth First Search Depth First Search Graph Topological Sort
Medium	Subset Sum Leetcode		LeetCode Array Dynamic Programming
Medium	Add and Search Word – Data structure design LeetCode		LeetCode Backtracking Design String Trie
Easy	Sum of f(a[i], a[j]) over all pairs in an array of n integers	Cisco Facebook Hike Publicis Sapient	hashing Array
	Longest Repeated Subsequence		dynamic-programming
Easy	Count of index pairs with equal elements in an array	Amazon Atlassian Facebook Intuit Snapdeal	hashing Array Sorting
Easy	Find Sum of all unique sub-array sum for a given array	Amazon Facebook GreyOrange Intuit Microsoft Nagarro	hashing Array Sorting
	Sequences of given length where every element is more than or equal to twice of previous		dynamic-programming
	Find maximum length Snake sequence		dynamic-programming
Medium	Print all triplets in sorted array that form AP	Accolite Cadence India Google Intuit Pinterest	array
	Minimum sum of multiplications of n numbers		dynamic-programming
Medium	Find number of pairs in an array such that their XOR is 0	Cadence India CouponDunia Indeed Pinterest	array Sorting
	Count ways to reach the nth stair using step 1, 2 or 3		dynamic-programming
	Minimum Sum Path in a Triangle		dynamic-programming
Medium	Longest subarray not having more than K distinct elements	Amazon Delhivery Facebook Microsoft Samsung	hashing Array
Medium	Morris Traversal	Amazon Facebook Fourkites Google Microsoft	tree Tree Traversal
	Kth ancestor of a node in binary tree		tree
Hard	Maximum possible difference of two subsets of an array	Atlassian Cadence India FreeCharge Opera PayU Snapchat Times Internet Xome	hashing Array Sorting
	Find postorder traversal of BST from preorder traversal		tree
	Inorder Successor of a node in Binary Tree		tree
	Given an Array of Pairs Find all Symmetric Pairs in it	Amazon Capgemini Cisco FreeCharge Opera Xome	array
	Minimum operation to make all elements equal in array		hashing
	Check if a given array can represent Preorder Traversal of Binary Search Tree		tree
	Construct Binary Tree from given Parent Array representation		tree
	Given a binary tree, how do you remove all the half nodes?		tree
	Iterative Preorder Traversal		tree
	Find subarray with given sum (Handles Negative Numbers)		hashing
	Length of the largest subarray with contiguous elements		hashing
	Find distance between two nodes of a Binary Tree		tree
	Count number of triplets with product equal to given number		hashing
	Maximum difference between first and last indexes of an element in array		hashing
	Write Code to Determine if Two Trees are Identical		tree
	Find any one of the multiple repeating elements in read only array		hashing
	Find elements which are present in first array and not in second		hashing
	Boundary Traversal of binary tree		tree
	Check for Palindrome after every character replacement Query		hashing
	Difference between highest and least frequencies in an array		hashing
	Diagonal Traversal of Binary Tree		tree
	Bottom View of a Binary Tree		tree
	Letter Combinations of a Phone Number		queue
	Find four elements that sum to a given value (Hashmap)		hashing
	Count even length binary sequences with same sum of first and second half bits		dynamic-programming
	Longest subsequence such that difference between adjacents is one		dynamic-programming
	Find all triplets with zero sum		array
	k-th missing element in increasing sequence which is not present in a given sequence		hashing
	How to check if two given sets are disjoint?		hashing
	Check if a given array contains duplicate elements within k distance from each other		hashing
	Print Right View of a Binary Tree		tree
	Count Negative Numbers in a Sorted Matrix LeetCode Solution		LeetCode Matrix
	Check if two arrays are equal or not		hashing
	Pair with given product		hashing
	Maximum path sum in a triangle		dynamic-programming
	Path with maximum average value		dynamic-programming
	Maximum Distance in Array		matrix
	Find if there is a subarray with 0 sum		hashing
	Find missing elements of a range		hashing
	First element occurring k times in an array		hashing
	Maximum product of an increasing subsequence		dynamic-programming
	Print all subarrays with 0 sum		hashing
	Contains Duplicate		hashing
	Print Maximum Length Chain of Pairs		dynamic-programming
	Print n terms of Newman-Conway Sequence		dynamic-programming
	Count Substrings with equal number of 0s, 1s and 2s		hashing String
	Longest Substring Without Repeating Characters		string
	Remove Duplicates from Sorted List II		linked-list
	Form minimum number from given sequence		string
	Print modified array after executing the commands of addition and subtraction		dynamic-programming
	Write a function to get the intersection point of two Linked Lists		linked-list
	Newman-Conway Sequence		dynamic-programming
	Generate all possible sorted arrays from alternate elements of two given sorted arrays		array
	Moser-de Bruijn Sequence		dynamic-programming
	Range Queries for Longest Correct Bracket Subsequence		dynamic-programming
	Print modified array after multiple array range increment operations		dynamic-programming
	Number of indexes with equal elements in given range		dynamic-programming
	Longest Bitonic Subsequence		dynamic-programming
	Golomb sequence		dynamic-programming
	Array Queries for multiply, replacements and product		array
	Newman–Shanks–Williams prime		dynamic-programming
	Difference Array \| Range update query in O(1)		dynamic-programming
	Painting Fence Algorithm		dynamic-programming
	Check in binary array the number represented by a subarray is odd or even		array
	Largest subarray with equal number of 0s and 1s		hashing
	Binary array after M range toggle operations		dynamic-programming
	Constant time range add operation on an array		dynamic-programming
	Delete Nth node from the end of the given linked list		linked-list
	Delete a Node from linked list without head pointer		linked-list
	Count Primes in Ranges		dynamic-programming
	Print the Fibonacci numbers in reverse order		dynamic-programming
	Print Fibonacci sequence using 2 variables		dynamic-programming
	Non-overlapping sum of two sets		hashing
	Find all pairs (a, b) in an array such that a % b = k		hashing
	Range LCM Queries		tree
	Queries on XOR of greatest odd divisor of the range		dynamic-programming
	Compute nCr % p		dynamic-programming
	Cutting a Rod		dynamic-programming
	Queries for counts of array elements with values in given range		array
	Number of elements less than or equal to a given number in a given subarray		tree
	Largest divisible pairs subset		dynamic-programming
	GCDs of given index ranges in an array		tree
	Queries for GCD of all numbers of an array except elements in a given range		dynamic-programming
	Find whether a subarray is in form of a mountain or not		dynamic-programming
	Mean of range in array		dynamic-programming
	Subset with sum divisible by m		dynamic-programming
	Check if any two intervals overlap among a given set of intervals		dynamic-programming
	Range sum queries without updates		dynamic-programming
	Max stack		stack
	Subset Sum Problem in O(sum) space		dynamic-programming
Easy	Find Index of Closing Bracket for a Given Opening Bracket in an Expression	Adobe Amazon Flipkart Oracle OYO Rooms Snapdeal Walmart Labs Yatra	stack Array String
	Products of ranges in an array		array
	Friends Pairing Problem		dynamic-programming
	Happy Number
	Palindrome Permutation		array
	Gold Mine Problem		dynamic-programming
	Palindrome Number
Easy	Design a stack that supports getMin() in O(1) time and O(1) extra space	Adobe Amazon Factset Flipkart Goldman Sachs GreyOrange Kuliza Microsoft Paytm Publicis Sapient SAP Snapdeal VMware	stack
	Find Maximum Level sum in Binary Tree		tree
	Tiling Problem		dynamic-programming
	Permutation Coefficient		dynamic-programming
Easy	Sort a stack using recursion	Amazon Goldman Sachs IBM Kuliza Yahoo	stack
	Longest Increasing Consecutive Subsequence		dynamic-programming
	Red-Black Tree Introduction		tree
Easy	Delete middle element of a stack	Amazon	stack
Medium	Sorting array using Stacks	Amazon Goldman Sachs IBM Kuliza Yahoo	stack Sorting
	Binomial Coefficient		dynamic-programming
	Binary Search Tree Delete Operation		tree
	Best Time to Buy and Sell Stock		dynamic-programming
	Implementation of Deque using Doubly Linked List		linked-list
Medium	Delete consecutive same words in a sequence	Factset	string Array Sorting Stack
	Iterative Method to find Height of Binary Tree		tree
Medium	Sort a stack using a temporary stack	Amazon Goldman Sachs IBM Kuliza Yahoo	stack Sorting
Easy	Reverse a stack without using extra space in O(n)	Factset MAQ	stack
	Clone a Binary Tree with Random Pointers		tree
	Top K Frequent Elements		queue
	Level order traversal using two Queues		queue
Easy	Bubble sort using two Stacks	Amazon Capgemini Delhivery MAQ	stack Array Sorting
Hard	Text Justification	Amazon Coursera Google Indeed LinkedIn Microsoft Pinterest Snapchat	string
Easy	Reverse individual words	Amazon	string Stack
Medium	Count subarrays where second highest lie before highest	HackerRank	stack Array
	Find the smallest binary digit multiple of given number		graph
	Minimum Operations to convert X to Y		graph
Easy	Find maximum difference between nearest left and right smaller elements	Fourkites	stack Array
Medium	Remove brackets from an algebraic string containing + and – operators	Adobe Amazon Fourkites	stack String
Easy	Implement a stack using single queue	Amazon Fourkites Google MAQ Microsoft	stack Queue
	Find the First Circular Tour that visits all the Petrol Pumps		queue
	Sort an array according to the order defined by another array		array
	Rearrange a binary string as alternate x and y occurrences		array String
	Shuffle 2n integers as a1-b1-a2-b2-a3-b3-..bn without using extra space		array
	Distinct adjacent elements in an array		array
	Construction of Longest Increasing Subsequence (N log N)		array
	Maximize sum of consecutive differences in a circular array		array
	Three way partitioning of an array around a given range		array
	Minimum time required to rot all oranges		graph
	Check if X can give change to every person in the Queue		array
	Check if two nodes are on the same path in a Tree		graph
	Check if all levels of two Binary Tree are anagrams or not		tree
	Minimum sum of squares of character counts in a given string after removing k characters		queue String
	Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’		array
	Maximum length subsequence with difference between adjacent elements as either 0 or 1		array
	Replace two consecutive equal values with one greater		array
	Find a sorted subsequence of size 3 in linear time		array
	Maximum Product Subarray		array
	Convert array into Zig-Zag fashion		array
	First negative integer in every window of size k		queue
	Queue based approach for first non-repeating character in a stream		queue
	Distance of nearest cell having 1 in a binary matrix		queue
	Sum of minimum and maximum elements of all subarrays of size k		queue
	An Interesting Method to generate Binary Numbers from 1 to n		tree
	Find the largest multiple of 3		queue
	Transpose Graph		graph
	Check if the given array can represent Level Order Traversal of Binary Search Tree		tree
	Number of siblings of a given Node in n-ary Tree		tree
	Check whether a given Binary Tree is Complete or not		tree
	Count the number of nodes at given level in a tree using BFS		tree
	BFS for Disconnected Graph		graph
	Page Replacement Algorithms in Operating Systems		algorithm
	Check if a queue can be sorted into another queue using a stack		queue
	Priority Queue using doubly linked list		queue
	Implement Stack and Queue using Deque		queue
	Form Minimum Number From Given Sequence	Amazon Goldman Sachs	stack Array String
	Minimum number of distinct elements after removing m items		tree
	Convert BST into a Min-Heap without using array		tree
Medium	Pattern Occurrences using Stack		stack String
Medium	Number Of Longest Increasing Subsequence	Amazon Samsung Zoho	dynamic-programming Array
	Merge two BSTs with limited extra space		tree
	Count subarrays with equal number of 1’s and 0’s		hashing
Easy	Iterative Postorder Traversal Using Two Stacks	Adobe Amazon Factset Fourkites Paytm	stack Tree
Medium	Stack Permutations (Check if an array is stack permutation of other)	Amazon Fourkites	stack Queue
	Palindrome Substring Queries		hashing String
	Rearrange array such that even index elements are smaller and odd index elements are greater		array
	Segregate even and odd numbers		array
	Minimum Steps to reach target by a Knight		graph
	Binary Tree to Binary Search Tree Conversion using STL set		tree
Medium	Growable array based stack	MAQ Walmart Labs	stack Array
Easy	Find Minimum In Rotated Sorted Array	Adobe Amazon Microsoft Morgan Stanley Samsung Snapdeal Times Internet	array
	Implementation of Deque using circular array		queue
	Move all negative elements to end in order with extra space allowed		array
	K’th Largest element in BST using constant extra space		tree
	Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest		sorting
	Rearrange array such that even positioned are greater than odd		array
	Double the first element and move zero to end		array
	Arrange given numbers to form the biggest number		string
	K’th Largest Element in BST when modification to BST is not allowed		tree
Easy	Tracking current Maximum Element in a Stack	Factset Fourkites	stack
Medium	Iterative method to find ancestors of a given binary tree	Adobe Amazon Fourkites Google Morgan Stanley Paytm Samsung	stack Tree
Easy	Check if stack elements are pairwise consecutive	Delhivery Factset Fourkites	stack
Easy	Remove duplicates from sorted array	Amazon Facebook Morgan Stanley Wipro Xome Zoho	array
	Check if each internal node of a BST has exactly one child		tree
	Elements to be added so that all elements of a range are present in array		hashing
	Count subarrays having total distinct elements same as original array		hashing
Easy	Product of array except self	Accolite Amazon DE Shaw Morgan Stanley Opera	array
	Height of a generic tree from parent array		tree
	Find k-th smallest element in BST (Order Statistics in BST)		tree
Easy	Linked List Cycle	Accolite Amazon MAQ Samsung	linked-list
	Vertical sum in a given binary tree		tree
	A program to check if a binary tree is BST or not		tree
	Check for Identical BSTs without building the trees		tree
Easy	Maximum Depth Of Binary Tree	Amazon Cadence India CouponDunia Factset FreeCharge MakeMyTrip Monotype Solutions Snapdeal Synopsys Teradata VMware Zoho	tree Depth First Search Tree Traversal
	Palindrome Partitioning		dynamic-programming
Hard	First missing positive	Accolite Amazon Factset Samsung Snapdeal	array
Medium	Contiguous Array Leetcode	Amazon Facebook Google	LeetCode Array Hashing
Easy	Reverse Integer	MakeMyTrip MAQ	string
Easy	Reverse words in a string	Accolite Adobe Amazon Cisco Goldman Sachs MakeMyTrip MAQ Microsoft Morgan Stanley Paytm PayU SAP Labs Wipro Zoho	string
Easy	Reverse a String	MAQ o9 solutions TCS	string
Easy	Seconds to Days	MAQ
	Program for Bridge and Torch problem		LeetCode
	Cuckoo Hashing		hashing
	Subarrays with distinct elements		hashing
	Find the minimum distance between two numbers		array
	Boolean Parenthesization Problem		dynamic-programming
	K maximum sums of overlapping contiguous sub-arrays		dynamic-programming
	Count quadruples from four sorted arrays whose sum is equal to a given value x		hashing
	Count pairs from two linked lists whose sum is equal to a given value		hashing
	Find sum of non-repeating elements (distinct) elements in an array		hashing
	Find distinct elements common to all rows of a matrix		hashing
	Numbers with prime frequencies greater than or equal to k		hashing
	Convert an array to reduced form		hashing
	Find pairs with given sum such that elements of pair are in different rows		hashing
	Common elements in all rows of a given matrix		hashing
	Count pairs from two sorted arrays whose sum is equal to a given value x		array
	Find all permuted rows of a given row in a matrix		hashing
	How to print maximum number of A’s using given four keys		dynamic-programming
	Collect maximum points in a grid using two traversals		dynamic-programming
	Given two unsorted arrays find all pairs whose sum is x		hashing
	Convert BST to Min Heap		tree
	Sort elements by frequency		hashing
Easy	Convert String To Int	MAQ	string
	Find the first repeating element in an array of integers		hashing
	Maximum weight transformation of a given string		dynamic-programming String
	Word Wrap Problem		dynamic-programming
	The Painter’s Partition Problem		dynamic-programming
	Maximum Subarray Sum Excluding Certain Elements		dynamic-programming
	Merge Two Balanced Binary Search Trees		tree
	Binary Search Tree Search and Insertion		tree
	Count items common to both the lists but with different prices		hashing
	Mobile Numeric Keypad Problem		dynamic-programming
	Find the subarray with least average		array
	Find the smallest positive integer value that cannot be represented as sum of any subset of a given array		array
	Minimum number of subsets with distinct elements		hashing
	Maximum sum bitonic subarray		dynamic-programming
	Find minimum number of merge operations to make an array palindrome		array
	Minimize the maximum difference between the heights		array
	Longest Span with same Sum in two Binary arrays		hashing
	Convert a normal BST to Balanced BST		tree
	Largest area rectangular sub-matrix with equal number of 1’s and 0’s		dynamic-programming
	A Space Optimized DP solution for 0-1 Knapsack Problem		dynamic-programming
	Check given array of size n can represent BST of n levels or not		tree
	Find maximum average subarray of k length		array
	Printing brackets in Matrix Chain Multiplication Problem		dynamic-programming
	Size of The Subarray With Maximum Sum		dynamic-programming
	Find minimum difference between any two elements		array
	Minimum number of jumps to reach end		dynamic-programming
	Number of palindromic paths in a matrix		dynamic-programming
	Largest rectangular sub-matrix whose sum is 0		dynamic-programming
	Maximum sum rectangle in a 2D matrix		dynamic-programming
	Count minimum steps to get the given desired array		array
	Maximum Sum Increasing Subsequence		dynamic-programming
	Largest Sum Contiguous Subarray		dynamic-programming
	Matrix Chain Multiplication		dynamic-programming
	Binary Tree to Binary Search Tree Conversion		tree
	Sorted Linked List to Balanced BST		tree
	Sorted Array to Balanced BST		tree
	Transform a BST to Greater sum Tree		tree
	Convert a BST to a Binary Tree such that sum of all greater keys is added to every key		tree
	Advantages of BST over Hash Table		tree
	Construct BST from its given Level Order Traversal		tree
	Construct BST from given Preorder Traversal		tree
	BST to a Tree with Sum of all Smaller Keys		tree
	Find the node with minimum value in a Binary Search Tree		tree
Easy	Single Number	Amazon	algorithm Array
Hard	Shortest Palindrome	Amazon Delhivery Factset	string
	Subset Leetcode		LeetCode
	Shuffle an Array		algorithm
	Maximal Square		matrix
	Super Ugly Number		dynamic-programming
	Dividing Array into Pairs With Sum Divisible by K		array
	Find Number of Employees Under every Employee		hashing
	Count Distinct Elements in Every Window of Size K		array
	Count Subsets Having Distinct Even Numbers		array
	Find Three Element From Different Three Arrays Such That a + b + c = sum		array
	Special Number		algorithm
	Divisible Pairs Counting		dynamic-programming
	Word Search		matrix
	K Empty Slots		algorithm
	The Knapsack Problem		dynamic-programming
	Bellman Ford Algorithm		algorithm
	Huffman Coding		algorithm
	Data Structure Designing
	Longest Increasing Subsequence		array
	Reverse Bits		string
	Construct Binary Tree from Given Inorder and Preorder Traversals		tree
	Smallest Element Repeated Exactly K Times		hashing
	K-th Distinct Element in an Array		hashing
	Cumulative Frequency of Count of Each Element in an Unsorted Array		hashing
	Group Words With Same Set of Characters		hashing
	First non Repeating Element		hashing
	Second Most Repeated Word in a Sequence		hashing
	Count Pairs Whose Products Exist in Array		array
	Print All Distinct Elements of a Given Integer Array		hashing
	Pair of Positive Negative Values in an Array		hashing
	Remove Minimum Number of Elements Such That no Common Element Exist in both Array		hashing
	Maximum Occurring Character		hashing
	Count Pairs With Given Sum		hashing
	Insert Delete GetRandom		algorithm
	Merge Overlapping Intervals		array
	Decode Ways		dynamic-programming
	Median of Two Sorted Arrays		array
	Edit Distance		string
	Maximum Product Subarray		array
Hard	Substring With Concatenation Of All Words	Amazon DE Shaw	string Hashing
Medium	Top K Frequent Words	Accolite Fourkites	string Hashing Trie
	Reverse a Path in BST using Queue		tree
Medium	Print Ancestors of a Given Binary Tree Node Without Recursion	Accolite Amazon Fourkites	tree Stack Tree Traversal
Medium	Find Maximum of Minimum for Every Window Size in a Given Array	Amazon Flipkart SAP Labs Zoho	array Stack
Medium	Identify and Mark Unmatched Parenthesis in an Expression	TCS	stack String
Easy	Iterative Depth First Traversal of Graph	Amazon Factset Fanatics Google Oracle	graph Depth First Search Stack
Medium	Minimum Bracket Reversals	Amazon Fanatics	stack Queue String
Medium	Expression Contains Redundant Bracket or Not	Amazon Paytm	string Stack
Easy	Reverse a Number Using Stack	MAQ Nokia o9 solutions	stack
Medium	Swap Nodes In Pairs	Amazon Microsoft	linked-list
Medium	Zigzag Conversion	PayPal	string
Easy	Valid Palindrome	MAQ Nokia o9 solutions	string
Medium	Check if Two Expressions With Brackets are Same	Amazon Hike Oracle Snapdeal Walmart Labs Wipro Yatra Zoho	stack String
	Priority Queue Using Singly Linked List		queue
	Reversing the First K elements of a Queue		queue
	Sorting a Queue without Extra Space		queue
	Longest Common Prefix Using Word by Word Matching		array
	Minimum Size Subarray Sum		array
	Intersection of Two Arrays		array
	Leetcode Permutations		LeetCode
	Level order Traversal in Spiral Form		tree
	Kth Smallest Element in a BST		tree
	Search an Element in Sorted Rotated Array		array
	Valid Parenthesis String		string
	Maximum Product Subarray		array
	Toeplitz Matrix		matrix
	Balanced Binary Tree		tree
	Min Stack		stack
	Implement Stack using Queues		stack
	Interval Tree		tree
	Set Matrix Zeroes		matrix
	Smallest Multiple of a Given Number
	Construct Complete Binary Tree from its Linked List Representation		tree
	Lowest Common Ancestor		tree
	Reversing a Queue using Recursion		queue
	3 Sum		array
	Averages of Levels in Binary Tree		tree
	Queue using Stacks		queue
	Longest Palindromic Subsequence		dynamic-programming
	Find The Duplicate Number		array
	Maximum Sum of 3 Non-Overlapping Subarrays		array
	Minimum Index Sum of Two Lists		array
	Reservoir Sampling		algorithm
	Reversing a Queue		queue
	Split Array Into Consecutive Subsequences		array
	Lowest Common Ancestor in Binary Search Tree		tree
	KMP Algorithm		algorithm
	Most Frequent Element in an Array		hashing
	Evaluate Division		algorithm
	Prim’s Algorithm		algorithm
	Sudoku Solver		matrix
	Segment Tree		tree
	Minimum Path Sum		matrix
	Find Pair with Greatest Product in Array		hashing
	Minimum Cost to Hire K Workers		algorithm
	Find the Duplicate Element		array
	Fizz Buzz		algorithm
	Fizz Buzz Leetcode		LeetCode
Medium	Arithmetic Expression Evaluation	Amazon Oracle	stack
Medium	Maximum Product of Indexes of Next Greater on Left and Right	Factset Fourkites	stack Array
	Flood Fill LeetCode	Amazon Facebook Google	LeetCode Depth First Search Matrix
Easy	Check for Balanced Parentheses in an Expression	Amazon Hike Oracle Snapdeal Walmart Labs Wipro Yatra Zoho	stack String
Medium	Evaluation of Postfix Expression	Amazon Oracle	stack
Easy	Reverse a Stack Using Recursion	Factset Fourkites	stack
Easy	Find if an Expression has Duplicate Parenthesis or Not	Amazon Factset Oracle	stack String
Medium	How to Implement Stack Using Priority Queue or Heap?	Amazon Fanatics Fourkites	stack Queue
Medium	Iterative Tower of Hanoi	MAQ	stack
Medium	How to Efficiently Implement k Stacks in a Single Array?	Amazon Fourkites	stack Array
Medium	Find Maximum Depth of Nested Parenthesis in a String	Amazon Facebook	stack String
Medium	Expression Evaluation	Amazon Oracle	stack
Medium	How to Create Mergable Stack?	Amazon Factset Fanatics	stack
Medium	The Stock Span Problem	Amazon Delhivery MAQ	stack
Medium	Find Maximum Sum Possible Equal Sum of Three Stacks	Amazon Fanatics Fourkites	stack
Medium	Print Next Greater Number of Q queries	Amazon Factset Fanatics	stack Array
Medium	Check if an Array is Stack Sortable	Accolite Amazon	stack Array Sorting
	Smallest Subarray With all Occurrences of a Most Frequent Element		hashing
	Find Top K (or Most Frequent) Numbers in a Stream		hashing
	Find the Only Repetitive Element Between 1 to N-1		array
Easy	Reverse a String using Stack	Accolite Capgemini Delhivery Fanatics Fourkites	stack String
Medium	Next Greater Frequency Element	Capgemini Microsoft	hashing Array Stack
Easy	Number of NGEs to the Right	Accolite Fanatics Fourkites	stack Array
Medium	Balanced Expression with Replacement	Amazon Hike Oracle Snapchat Snapdeal Walmart Labs Wipro Yatra Zoho	stack String
Easy	K Empty Slots LeetCode	Amazon Google	LeetCode Array
	Trapping Rain Water		array
	Tower Of Hanoi		algorithm
	Sliding Window Technique		algorithm
	GCD Of Two Numbers		algorithm
	MiniMax Algorithm		algorithm
	Target Sum		dynamic-programming
	Counting Bits
	Merge K Sorted Linked Lists		linked-list
	Wiggle Sort		sorting
	Decode String		stack String
	Print a Binary Tree in Vertical Order		tree
	Finding K closest element		array
	Priority Queue in C++		queue
	Priority Queue		queue
	Change the Array into Permutation of Numbers From 1 to N		hashing
	Jump Game		array
	Recursion		stack
	Binary Search Tree		tree
Medium	Prefix to Infix Conversion	Amazon Fanatics	stack String
Easy	Postfix to Infix Conversion	Amazon Factset Microsoft	stack String
Medium	Prefix to Postfix Conversion	Amazon Factset Fanatics Oracle	stack String
Medium	Postfix to Prefix Conversion	Amazon Factset Fanatics Oracle	stack Array
Medium	Maximum Binary Tree	Amazon Google Microsoft Uber	tree
Medium	Nth Catalan Number	Amazon	algorithm Dynamic Programming
	Combination Sum		array
	Next Permutation		string
	Longest Common Subsequence		dynamic-programming
	Max Area of Island		graph
	Search in Sorted Rotated Array		array
	Binary Tree zigzag level order Traversal		tree
	Recover Binary Search Tree		tree
	Populating Next Right Pointers in Each Node		tree
	Top View of Binary Tree		tree
	Unique Paths		matrix
	Merge Two Sorted Linked Lists		linked-list
	Repeated Substring Pattern		string
	Letter Case Permutation		string
	Find Median from data Stream		algorithm
	Level of Each node in a Tree from source node		tree
	Longest Common Prefix using Sorting		string
	House Robber		dynamic-programming
	Maximum Subarray		array
	Sliding Window Maximum		array
	Delete And Earn		array
	Length of Longest Fibonacci Subsequence		array
	Rainbow Table
	Merging Intervals		array
	Backspace String Compare		stack String
	Word Break		LeetCode
	Graph Cloning		graph
	Hamming Distance		algorithm
	First Bad Version		array
	Word Pattern		string
	Peak Index in a Mountain Array		array
	Regular Expression Matching		string
	Reorganize String		string
Medium	Find Duplicate Subtrees	Amazon Google	tree
Medium	String Compression	Amazon Apple Facebook Goldman Sachs IBM Microsoft	string
Medium	4Sum	Adobe Amazon Apple Goldman Sachs	array
	Create Maximum Number		array
	Degree of an array		array
	Queue Reconstruction by Height		array
	Valid Parentheses		string
Easy	Search Insert Position	Adobe	array
	Find Peak Element		array
	Symmetric Tree		tree
	K-th Smallest Element in a Sorted Matrix		matrix
	Minimum Height Trees		tree
	Longest Common Prefix using Trie		string
	Valid Number		string
	Pascal Triangle Leetcode		LeetCode
	Trim a Binary Search Tree		tree
	Valid Triangle Number		array
	Convert Sorted List to Binary Search Tree		tree
Medium	Stone Game II Leetcode	Google	LeetCode Dynamic Programming
	Kruskal Algorithm		graph
	Number Of 1 bits		algorithm
	Power of Two		array
	Merge Two Sorted Lists Leetcode		LeetCode
	Validate Binary Search Tree		tree
	Reverse Nodes in K-Group		linked-list
Medium	Stone Game LeetCode	Adobe Apple Google	LeetCode Dynamic Programming
	Maximum size subarray sum equals k		array
	Path Sum		tree
	Find the Closest Palindrome number		string
	Count and Say		string
	Level Order Traversal of Binary Tree		tree
	Tree Traversal (Preorder, Inorder & Postorder)		tree
	LRU Cache Implementation		algorithm
	Merge Sort		sorting
	Find unique character in a string		string
	Integer to Roman		string
	Valid Sudoku		matrix
	Palindrome Partitioning		dynamic-programming
	Add two numbers		linked-list
	Next greater element		array
	Deletion in a Binary Tree		tree
	Unique Binary Search Trees		tree
	Floyd Warshall Algorithm		graph
	Bipartite Graph		graph
	Sieve of Eratosthenes		algorithm
	Strongly Connected Component		graph
	N queen problem		matrix
	Rabin Karp Algorithm		string
	Alien Dictionary		LeetCode
	Guess The Word		array
	Decision Tree		tree
	New 21 Game		dynamic-programming
	Verify Preorder Serialization of a Binary Tree		tree
	Missing Number		array
	Merge Sorted Array		array
	Partition Equal Subset Sum		array
	Last Stone Weight		array
	Sort Colors		array
	Rotate Array		array
	Applications of Breadth First Search and Depth First Search		graph
	Container with Most Water		algorithm
	Distinct Subsequences		dynamic-programming
	Matrix Chain Multiplication using Dynamic Programming		matrix
	Subarray Sum Equals k		array
	Infix to Postfix		array
	Isomorphic Strings		string
	Binary Tree Data Structure		tree
	Climbing stairs		dynamic-programming
	Topological Sorting		sorting
	Insertion Sort		sorting
Easy	Self Dividing Numbers	Adobe
	Quick Sort		sorting
	Types of Binary Tree		tree
	Insertion in a Binary Tree		tree
Medium	Perform String Shifts Leetcode	Amazon Facebook Microsoft	LeetCode String
	BFS vs DFS for Binary Tree		graph
	Depth First Search (DFS) for a Graph		graph
	Breadth First Search (BFS) for a Graph		graph
	String comparison containing wildcards		string
Hard	Serialize and Deserialize Binary Tree	Amazon Bloomberg Facebook Google Microsoft Oracle Uber Walmart Labs	tree
Easy	Fibonacci numbers	Apple DBOI Google MAQ o9 solutions SAP Labs	algorithm
	Graph and its representation		graph
	Reverse a linked list		linked-list
	Subset sum problem		dynamic-programming
	Circular Queue		array
	Heap Sort		sorting
Easy	Ugly Numbers	Delhivery Goldman Sachs Paytm	dynamic-programming
Easy	Dynamic Programming Basics	MAQ	dynamic-programming
	Dijkstra Algorithm		algorithm
Medium	Coin Change Problem	Amazon Apple Bloomberg ByteDance Facebook Goldman Sachs Google Oracle Walmart Labs	dynamic-programming Array
	Multiplication of two matrices		matrix
	Subtraction of two matrices		matrix
	Check if two given matrices are identical		matrix
	Addition of Matrices		matrix
	Transpose of a Matrix		matrix
	Check whether strings are k distance apart or not		string
	Program to toggle all characters in a string		string
	Check length of a string is equal to the number appended at its last		string
	Generate all binary strings without consecutive 1’s		string
	Check if all rows of a matrix are circular rotations of each other		string
	Sort a string according to another string		string
	Check if string can become empty by recursively deleting given sub-string		string
	Smallest palindrome after replacement		string
	Check if string follows order of characters by a pattern or not		string
	split-four-distinct-strings		string
	Even sub-string count		string
	Reverse string without temporary variable		string
	Recursive Palindrome check		string
	Minimum number of characters to be removed to make a binary string alternate		string
	Print all palindromic partitions of a string		string
	Count of character pairs at same distance as in english alphabets		string
	Minimum characters to be added at front to make string palindrome		string
	Convert a string that is repetition of a substring of length k		string
	Nth character in Concatenated Decimal string		string
	Kth Non-repeating character		string
	Compare two version numbers		string
	Remove minimum characters so that two strings become anagrams		string
	Generate all binary strings from given pattern		string
	Print all possible ways to break a string in bracket form		string
	Caesar Cipher		string
	Longest common subsequence withpermutations		string
	Perfect reversible string		string
	Longest palindrome can be formed by removing or rearranging characters		string
	Longest common prefix (word by word)		string
	Longest common prefix (Character by character)		string
	Permutations (STL)		string
	Calculate sum of all numbers present in a string		string
	Longest Common Prefix (Using Divide and Conquer)		string
	Lower Case To Upper Case		string
	Longest Common Prefix (Using Biary Search)		string
	Print shortest path to print a string on screen		string
	Remove Extra Spaces from a string		string
	Change gender of a given string		string
	Count number of substrings with k distinct characaters		string
	Removing spaces from a string using stringstream		string
	PANGRAM CHECK		string
	Repeated subsequence of length 2 or more		string
	Palindrome permutations of a string		string
	Split a string		string
	1`s and 2`s complement of binary number		string
	Longest Common Extension		string
	Convert string1 to string2 in one edit		string
	Find First non-repeating character in a string		string
	Remove recurring digits in a given number		string
	Recursively print all the sentences that can be formed from list of word lists		string
	Online algorithm for checking palindrome in a stream		string
	Check if two given strings are isomorphic to each other		string
	Length of longest valid substring		string
	Program to add two binary digits		string
	Recursive Implementation of atoi()		string
	Reverse a string without affecting special characters		string
	Recursive function to do substring search		string
	Print Longest common subsequence		string
	Rotate string to get lexicographically minimum string		string
	Number of sub-strings which recursively add up to 9		string
	Palindrome string (number)		string
	Print all possible words from phone digits		string
	Shortest Superstring Problem		string
	Transform one string to another using minimum number of given operations		string
	Print string of odd length in ‘X’ format		string
	Minimum insertions to form a shortest palindrome		string
	print all palindromic partitions		string
	Check rearranged string can form a palindrome		string
	Palindromes in a given range		string
	String(represents an integer) to value		string
	Count the number of words		string
	Print all anagrams together in a sequence of words		string
	Lexicographic rank of string		string
	Remove spaces from a string		string
	Find, second, frequent, character		string
	Find the second most frequent character		string
	Check if a given string is a rotation of a palindrome		string
	Sort an array of strings		string
	Recursively remove all adjacent duplicates		string
	Remove ‘b’ and ‘ac’ from a given string		string
	wildcard character matching		string
	Longest Palindromic Substring		string
	Given string is interleaving of two other strings or not		string
	Print all permutations with repetition		string
	Run length encoding		string
	List items containing all characters of a given word		string
	Write a program to print all permutations of a given string		string
	Check whether two strings are anagram of each other		string
	Print all interleavings of given two strings		string
	Print all duplicates in the input string		string
	A Program to check if strings are rotations of each other or not		string
	Given a string find its first non-repeating character		string
	Reverse words in a given string		string
	Find the smallest window in a string containing all characters of another string		string
	Divide a string in N equal parts		string
	Print Reverse of a string (Recursion)		string
	Remove characters from first string which are in second		string
	Sorting the array of strings		string
	Remove duplicates from a string		string
	Concatenation of two strings		string
	Reverse a String		string
	Most repeating character in a string		string
	Given a sorted array and a number x, find the pair in array whose sum is closest to x		array
	Find the subarray whose sum is equal to a given number X		array
	Basic SQL Interview Questions		sql-interview-questions
	Aggregate Functions in SQL		sql-interview-questions
	DB Locks in SQL		sql-interview-questions
	Indexes in SQL Interview Questions		sql-interview-questions
	Joins in SQL Interview Questions		sql-interview-questions
	Keys in SQL		sql-interview-questions
	Optimization in SQL		sql-interview-questions
	Oracle in SQL		sql-interview-questions
	Parameterized Query in SQL		sql-interview-questions
	Privileges and Roles in SQL		sql-interview-questions
	SQL Query Interview Questions		sql-interview-questions
	SQL Server Interview Questions		sql-interview-questions
	Arrange Even and Odd number such that Odd comes after Even		array
	Minimum number of Merge Operations to make an Array Palindrome		array
	Form minimum number from given sequence of D’s and I’s		array
	Longest span with same sum in two binary arrays		array
	Find the Subarray of given length with Least Average		array
	Find Zeros to be Flipped so that number of Consecutive 1’s is maximized		array
	Merge K Sorted Arrays and Print Sorted Output		array
	Find the minimum element in a sorted and rotated array		array
	Find the point where a monotonically increasing function becomes positive first time		array
	Print all possible combinations of r elements in a given array of size n		array
	Sort Elements by frequency		array
	Stock Buy Sell to Maximize Profit		array
	Merge Overlapping Intervals		array
	Maximum Subarray Sum using Divide and Conquer		array
	Pancake sorting Problem		array
	Pancake sorting		array
	Arrange given numbers to form the biggest number		array
	Iterative Implementation of quick sort		array
	Shuffle a given array		array
	Find the row with maximum number of 1’s		array
	Sorting a k sorted array		array
	Maximum product subarray		array
	Largest subarray with equal number of 0’s and 1’s		array
	Find the two numbers with odd occurrences in an unsorted array		array
	Maximum sum increasing subsequence		array
	Implement two stacks in an array		array
	Number of smaller elements on right side		array
	Increasing subsequence of length three with maximum product		array
	Elements appear more than n/k times in array		array
	Find the Peak element from an array		array
	Rearrange positive and negative numbers alternatively in Array		array
	Find the maximum repeating number in array		array
	Tug of War		array
	First Circular Tour to Visit all the Petrol Bunks		array
	Count Possible Triangles		array
	Maximum Circular Subarray Sum		array
	Four Elements that Sum to Given		array
	Maximum Length of Chain Pairs		array
	Find Pair with Given Difference		array
	Partition Problem		array
	The Celebrity Problem		array
	Find a Sorted Subsequence of size 3		array
	Subarray with Given Sum		array
	Maximum Element in an Array which is Increasing and then Decreasing		array
	Count Minimum Steps to Get the given Array		array
	Find the Lost Element From a Duplicated Array		array
	Rearrange given Array in Maximum Minimum Form		array
	Subarray and Subsequence		array
	Merge Two Sorted Arrays		array
	Count of Triplets With Sum Less than Given Value		array
	Reorder Array Using Given Indexes		array
	Next Greater Element in an Array		array
	Merging Two Sorted Arrays		array
	Reorder an Array According to the Given Indexes		array
	Find a Fixed Point in a Given Array		array
	Find Element Using Binary Search in Sorted Array		array
	Find Triplet in Array With a Given Sum		array
	Check if the Elements of an Array are Consecutive		array
	Find Duplicates in an Array in Most Efficient Way		array
	Sort 0s 1s and 2s in an Array		array
	Find Leaders in an Array		array
	Smallest Positive Number Missing in an Unsorted Array		array
	Find K Length Subarray of Maximum Average		array
	Find Pythagorean Triplets from Array		array
	Move All the Zeros to the End of the Given Array		array
	Find Minimum Distance Between Two Numbers in an Array		array
	Rotate Image by 90 degrees		array
	Count Number of Occurrences in a Sorted Array		array
	Maximum Sum of Non Consecutive Elements		array
	Find Smallest Missing Number in a Sorted Array		array
	First Repeating Element		array
	Multiplication of Previous and Next		array
	A Product Array Puzzle		array
	Find All Pairs With a Given Difference		array
	Find all Common Elements in Given Three Sorted Arrays		array
	Find the first Repeating Number in a Given Array		array
	Print All Distinct Elements of the Array		array
	Maximum difference between two elements such as larger element comes after smaller		array
	Majority Element		array
	Find the First and Second Smallest Elements		array
	Find the Number Occurring Odd Number of Times in an Array		array
	Sort Elements by Frequency of Occurrences		array
	Find the Missing Number		array
	Find Nearest Greater and Smaller Element		array
	Insert Node in the Sorted Linked List		linked-list
	Detect a loop in the Linked List		linked-list
	Find Nth Node		linked-list
	Swap kth node from beginning with kth node from end		linked-list
	Swap nodes in the linked list		linked-list
	Delete last occurrence		linked-list
	Check if a linked list of strings form a palindrome		linked-list String
	Merge two sorted linked lists such that merged list is in reverse order		linked-list
	Rearrange a given linked list in-place		linked-list
	Clone a Linked List with next and random pointer		linked-list
	Construct a Maximum Sum Linked List out of two Sorted Linked Lists having some Common nodes		linked-list
	Quick Sort on SIngly Linked List		linked-list
	Flatten a multilevel linked list		linked-list
	Rotate a Linked List		linked-list
	Union and Intersection of Two Linked Lists		linked-list
	Sort linked which is sorted on absolute values		linked-list
	Binary Tree to Doubly linked list		linked-list
	Rearrange a linked list in Zig-Zag		linked-list
	Clone a linked list with next and random pointer (Hashing)		linked-list
	Flattening a linked list		linked-list
	Segregate even and odd nodes in a linked list		linked-list
	Delete a node of a linked list at given position		linked-list
	Compare two strings(linked lists)		linked-list String
	Merge sort better than quick sort for linked lists		linked-list
	Sort a linked list that is sorted alternating ascending and descending		linked-list
	Remove middle points in a linked list of line segments		linked-list
	Can we reverse a linked list in less than O(n) time ?		linked-list
	Merge a linked list into another at alternate positions		linked-list
	Delete N nodes after M		linked-list
	Sort a linked list with 0s, 1s and 2s		linked-list
	Triplet from three linked lists with given sum		linked-list
	Delete a node under given conditions		linked-list
	Reverse a Linked List in groups		linked-list
	Reverse a singly linked list recursively		linked-list
	Reverse a Singly Linked List (Iterative/Non-Recursive)		linked-list
	Remove all duplicates in an unsorted linked list		linked-list
	Remove all duplicates in a sorted linked list		linked-list
	Check if the linked list is palindrome		linked-list
	Find the occurrences of a number in a linked list		linked-list
	Find nth node of the Linked list from the end		linked-list
	Find middle of the Linked List		linked-list
	Insert nodes in a linked list in a sorted way (Ascending Order)		linked-list
	Check if two linked lists are identical		linked-list
	Move last element of the Linked List at first place		linked-list
	Delete a node in doubly linked list		linked-list
	How to Delete a Linked List		linked-list
	Split linked list using alternate nodes		linked-list
	Create a Doubly Linked List		linked-list
	Delete a Tree		tree
	Binary Tree		tree
	Searching a node in a Binary Search Tree		tree
	Binary Tree Level order traversal in Java		tree
	Java program to find the number of Nodes in a Binary Tree		tree
	Largest Sum Contiguous Subarray		array
	Reverse an Array		array
	Find a Triplet That Sum to a Given Value		array
	Find elements pair from array whose sum equal to number		array

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