Next Greater Element I Leetcode Solution


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Problem Statement

Next Greater Element I Leetcode Solution – The next greater element of some element x in an array is the first greater element that is to the right of x in the same array.

You are given two distinct 0-indexed integer arrays nums1 and nums2, where nums1 is a subset of nums2.

For each 0 <= i < nums1.length, find the index j such that nums1[i] == nums2[j] and determine the next greater element of nums2[j] in nums2. If there is no next greater element, then the answer for this query is -1.

Return an array ans of length nums1.length such that ans[i] is the next greater element as described above.

Example 1:

Input:

 nums1 = [4,1,2], nums2 = [1,3,4,2]

Output:

 [-1,3,-1]

Explanation:

 The next greater element for each value of nums1 is as follows:
- 4 is underlined in nums2 = [1,3,4,2]. There is no next greater element, so the answer is -1.
- 1 is underlined in nums2 = [1,3,4,2]. The next greater element is 3.
- 2 is underlined in nums2 = [1,3,4,2]. There is no next greater element, so the answer is -1.

Example 2:

Input:

 nums1 = [2,4], nums2 = [1,2,3,4]

Output:

 [3,-1]

Explanation:

 The next greater element for each value of nums1 is as follows:
- 2 is underlined in nums2 = [1,2,3,4]. The next greater element is 3.
- 4 is underlined in nums2 = [1,2,3,4]. There is no next greater element, so the answer is -1.

Constraints:

  • 1 <= nums1.length <= nums2.length <= 1000
  • 0 <= nums1[i], nums2[i] <= 104
  • All integers in nums1 and nums2 are unique.
  • All the integers of nums1 also, appear in nums2.

Follow up: Could you find an O(nums1.length + nums2.length) solution?

Approach

Idea:

  1. we make a map to store every element’s next greater element
  2. to find the next greater element in nums2 we maintain a monotonically increasing stack
  3.  to do this we traverse the nums2 array from (n-1 to 0    where n is the size of nums2)
  4. if the stack is not empty, then compare its top element with nums2[i]
  5.  if the nums2[i] is greater than stack’s top element, then we pop from stack while (!st.empty() && st.top()>nums2[i] )
  6.  now if we find an element in the stack then we store it in the map
    otherwise, we store -1 in the map
  7.  now we push nums2[i] into the stack as it might be the next greater element for elements ranges b/w (i-1 to 0)

Next Greater Element I Leetcode SolutionPin

C++ Program of  Next Greater Element I

class Solution {
public:
    vector<int> nextGreaterElement(vector<int>& nums1, vector<int>& nums2) {
     
        map<int,int> mp;
        stack<int> st;
        
        for(int i=nums2.size()-1;i>=0;i--)
        {
            while(!st.empty() && st.top()<nums2[i])
                st.pop();
            
            if(st.empty())
                mp[nums2[i]]=-1;
            else
                mp[nums2[i]]=st.top();
            
            st.push(nums2[i]);
            
        }
        
        for(int i=0;i<nums1.size();i++)
        {
            nums1[i]=mp[nums1[i]];
        }
        
        return nums1;
        
        
        
    }
};

Java Program of  Next Greater Element I

class Solution {
    public int[] nextGreaterElement(int[] nums1, int[] nums2) {
        Map<Integer, Integer> mp = new HashMap<>();
        
        Stack<Integer> st = new Stack<>();
        
        
        for (int i=nums2.length-1;i>=0;i--) {
            
            while (!st.isEmpty() && st.peek() < nums2[i])
                st.pop();
            
            if(st.isEmpty())
            {
                mp.put(nums2[i],-1);
            }
            else
            {
                mp.put(nums2[i],st.peek());
            }
            
            st.push(nums2[i]);
        }   
        for (int i = 0; i < nums1.length; i++)
            nums1[i] = mp.getOrDefault(nums1[i], -1);
        return nums1;
    }
}

Complexity Analysis for Next Greater Element I Leetcode Solution

Time Complexity

O(n+m) where n is the size of nums1 and m is the size of nums2

Space Complexity

O(m) as we use a map to store every element’s next element and stack to find the next greater element

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537Convert a normal BST to Balanced BST181
538Last Stone Weight181
539Relative Sort Array Leetcode Solution181
540Excel Sheet Column Title Leetcode Solution181
541Delete Node in a Linked List Leetcode Solution181
542Smallest Subarray With all Occurrences of a Most Frequent Element181
543Contiguous Array Leetcode181
544Group Multiple Occurrence of Array Elements Ordered by first Occurrence180
545Koko Eating Bananas Leetcode Solution180
546Valid Sudoku180
547Change the Array into Permutation of Numbers From 1 to N180
548K-th Distinct Element in an Array179
549N-th Tribonacci Number Leetcode Solution179
550Is Subsequence Leetcode Solution179
551Minimum Bracket Reversals179
552Linked List Cycle II LeetCode Solution179
553Isomorphic Strings Leetcode Solution179
554Container with Most Water179
555Best Time to Buy and Sell Stock179
556Distribute Candies to People Leetcode Solution179
557Jewels and Stones Leetcode Solution178
558Implementation of Deque using circular array178
559Number of Provinces Leetcode Solution178
560Assign Cookies Leetcode Solution178
561Integer to Roman178
562Find Words That Can Be Formed by Characters Leetcode Solution178
563Sum of Left Leaves Leetcode Solutions178
564First negative integer in every window of size k178
565Minimum Operations to convert X to Y178
566Minimum Delete Operations to make all Elements of Array Same178
567Check for Balanced Parentheses in an Expression177
568Valid Anagrams177
569Minimum Knight Moves LeetCode Solution177
570Unique Binary Search Trees177
571Gold Mine Problem177
572Build Array From Permutation Leetcode Solution177
573Largest Perimeter Triangle Leetcode Solution177
574Island Perimeter Leetcode Solution177
575Arrange given numbers to form the biggest number177
576Summary Ranges Leetcode Solution177
577Convert Sorted Array to Binary Search Tree Leetcode Solution177
578Shuffle an Array177
579Trapping Rain Water LeetCode Solution176
580Maximum path sum in a triangle176
581Hamming Distance176
582Maximum sum rectangle in a 2D matrix176
583Remove Linked List Elements Leetcode Solution176
58401 Matrix LeetCode Solution176
585LRU Cache LeetCode Solution176
586Combinations Leetcode Solution176
587Rotate List Leetcode Solution175
588Find the smallest positive integer value that cannot be represented as sum of any subset of a given array175
589Decode Ways175
590Count the number of nodes at given level in a tree using BFS175
5913Sum Closest LeetCode Solution175
592Count all subsequences having product less than K175
593The Knapsack Problem175
594Minimum insertions to form a palindrome with permutations allowed174
595Minimum number of subsets with distinct elements174
596Shortest Path in a Grid with Obstacles Elimination LeetCode Solution174
597Insert Interval Leetcode Solution173
598Maximum Distance in Array173
599Bubble sort using two Stacks173
600Maximum Number of Chocolates to be Distributed Equally Among k Students173
601Same Tree LeetCode Solution173
602Minimum number of distinct elements after removing m items173
603Find minimum difference between any two elements173
604Distance Between Bus Stops Leetcode Solution173
605Longest Increasing Subsequence172
606Stone Game LeetCode172
607Sort Characters By Frequency LeetCode Solution172
608How to check if two given sets are disjoint?172
609Rotate Image LeetCode Solution172
610Sieve of Eratosthenes172
611XOR Operation in an Array Leetcode Solution172
612Defanging an IP Address Leetcode Solution171
613Permutation in String Leetcode Solution171
614Replace Elements with Greatest Element on Right Side Leetcode Solution171
615Reverse a stack without using extra space in O(n)171
616Applications of Breadth First Search and Depth First Search171
617Frog Jump Leetcode Solution171
618Find if an Expression has Duplicate Parenthesis or Not171
619Painting Fence Algorithm171
620License Key Formatting Leetcode Solution171
621Word Pattern170
622K Empty Slots LeetCode170
623Word Wrap Problem170
624Minimum Cost to Hire K Workers170
625Sort Array By Parity LeetCode Solution170
626House Robber170
627Remove All Occurrences of a Substring LeetCode Solution170
628Find the Duplicate Number LeetCode Solution170
629Smallest Good Base170
630Minimum Depth of Binary Tree Leetcode Solution169
631Non-overlapping sum of two sets169
632Printing brackets in Matrix Chain Multiplication Problem169
633Longest Substring with At Least K Repeating Characters LeetCode Solution169
634Best Time to Buy and Sell Stock LeetCode Solution169
635Segregate 0s and 1s in an Array169
636Distance of nearest cell having 1 in a binary matrix169
637Maximum Consecutive Numbers Present in an Array169
638Isomorphic Strings169
639Tracking current Maximum Element in a Stack169
640Optimal Account Balancing LeetCode Solution169
641Binary Tree Zigzag Level Order Traversal LeetCode Solution168
642Coin Change Problem168
643Employee Free Time LeetCode Solution168
644Merge Two Balanced Binary Search Trees168
645Iterative Method to find Height of Binary Tree168
646Find Sum of all unique sub-array sum for a given array168
647Longest Substring with At Most K Distinct Characters LeetCode Solution168
648Moving Average from Data Stream Leetcode Solution168
649Valid Palindrome II Leetcode Solution168
650Wiggle Sort168
651Sum of All Odd Length Subarrays Leetcode Solution167
652How to Create Mergable Stack?167
653Queries for counts of array elements with values in given range167
654Count Good Nodes in Binary Tree Leetcode Solution167
655Maximum difference between first and last indexes of an element in array167
656Minimum Number of Steps to Make Two Strings Anagram Leetcode Solutions167
657Reorganize String167
658Path With Maximum Minimum Value LeetCode Solution167
659Check If It Is a Straight Line Leetcode Solution167
660Find Maximum Level sum in Binary Tree167
661Kth Missing Positive Number Leetcode Solution167
662Maximum Number of Occurrences of a Substring Leetcode Solution166
663Strobogrammatic Number LeetCode Solution166
664GCD Of Two Numbers166
665Find the Distance Value Between Two Arrays Leetcode Solution166
666Flipping an Image LeetCode Solution166
667Best Time to Buy and Sell Stock with Cooldown Leetcode Solution166
668Reducing Dishes LeetCode Solution165
669Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest165
670Delete consecutive same words in a sequence165
671K Empty Slots165
672Print the Fibonacci numbers in reverse order165
673Find Largest d in Array such that a + b + c = d165
674Letter Combinations of a Phone Number165
675Find pairs with given sum such that elements of pair are in different rows165
676Valid Palindrome165
677Convert an array to reduced form165
678Remove Invalid Parentheses Leetcode Solution165
679To Lower Case Leetcode Solution164
680Partition Labels LeetCode Solution164
681Check If Two String Arrays are Equivalent Leetcode Solution164
682BFS vs DFS for Binary Tree164
683Factorial Trailing Zeroes Leetcode Solution164
684Number of Dice Rolls With Target Sum LeetCode Solution164
685Maximum Number of Coins You Can Get Leetcode Solution164
686Inorder Successor of a node in Binary Tree164
687Check if a queue can be sorted into another queue using a stack164
688Increasing Decreasing String Leetcode Solution164
689Longest Increasing Path in a Matrix LeetCode Solution163
690Edit Distance LeetCode Solution163
691Lucky Numbers in a Matrix Leetcode Solution163
692Find Leaves of Binary Tree LeetCode Solution163
693Valid Perfect Square Leetcode Solution163
694Find the Smallest Divisor given a Threshold Leetcode Solution163
695Partition Array Into Three Parts With Equal Sum Leetcode Solution163
696Recover Binary Search Tree163
697Subset Sum Leetcode163
698Form minimum number from given sequence163
699Permutation Sequence LeetCode Solution163
700Delete Nth node from the end of the given linked list163
701Power of Four Leetcode Solution163
702Populating Next Right Pointers in Each Node163
703Reversing a Queue using Recursion162
704Binary Tree zigzag level order Traversal162
705Merge Two Binary Trees LeetCode Solution162
706String to Integer (atoi) LeetCode Solution162
707Ugly Number Leetcode Solution162
708Reverse Only Letters LeetCode Solution162
709Construct BST from given Preorder Traversal162
710Unique Paths II Leetcode Solution162
711Sort Array by Increasing Frequency Leetcode Solution162
712Maximum Product of Two Elements in an Array Leetcode Solution162
713Dynamic Programming Basics162
714Find whether an array is subset of another array162
715Robot Room Cleaner Leetcode Solution161
716Add and Search Word – Data structure design LeetCode161
717Binomial Coefficient161
718Convert a Number to Hexadecimal Leetcode Solution161
719Reservoir Sampling161
720Keyboard Row Leetcode Solution161
721Decompress Run-Length Encoded List Leetcode Solution161
722Restore IP Addresses Leetcode Solution160
723Perform String Shifts Leetcode160
724Find the node with minimum value in a Binary Search Tree160
725Finding K closest element160
726Majority Element II Leetcode Solution160
727Find the largest multiple of 3160
728Bulb Switcher LeetCode Solution160
729Hamming Distance Leetcode Solution159
730Numbers with prime frequencies greater than or equal to k159
731Word Pattern LeetCode Solution159
732Minimum Cost For Tickets Leetcode Solution159
733Find Pair with Greatest Product in Array159
734Rank Transform of an Array Leetcode Solution159
735Check if Two Expressions With Brackets are Same159
736Find Maximum Depth of Nested Parenthesis in a String159
737Race Car LeetCode Solution159
738Sum of f(a[i], a[j]) over all pairs in an array of n integers159
739Snakes and Ladders LeetCode Solution159
740Minimum time required to rot all oranges158
741Queue based approach for first non-repeating character in a stream158
742Tiling Problem158
743Generate all possible sorted arrays from alternate elements of two given sorted arrays158
744Longest Span with same Sum in two Binary arrays158
745Number of Islands II LeetCode Solution158
746Minimum Distance Between BST Nodes Leetcode Solution158
747Merge K Sorted Linked Lists158
748Morris Traversal158
749Maximum 69 Number Leetcode Solution158
750Minimum Height Trees158
751Non-decreasing Array LeetCode Solution158
752Maximum Product of Three Numbers LeetCode Solution158
753Binary Tree Maximum Path Sum LeetCode Solution158
754Invert Binary Tree LeetCode Solution158
755First Unique Character in a String LeetCode Solution158
756Student Attendance Record I Leetcode Solution158
757Find unique character in a string158
758Best Meeting Point LeetCode Solution157
759Linked List Cycle157
760Minimize Maximum Pair Sum in Array LeetCode Solution157
761Sorted Linked List to Balanced BST157
762String Compression LeetCode Solution157
763Remove Nth Node From End of List Leetcode Solution157
764Find if Path Exists in Graph Leetcode Solution157
765Kth ancestor of a node in binary tree157
766Remove brackets from an algebraic string containing + and – operators157
767Stack Permutations (Check if an array is stack permutation of other)157
768Maximum Depth of N-ary Tree Leetcode Solution157
769Diagonal Traversal of Binary Tree157
770Largest subarray with equal number of 0s and 1s157
771Total Numbers With no Repeated Digits in a Range156
772Maximum Length of a Concatenated String with Unique Characters Leetcode Solution156
773Partition to K Equal Sum Subsets Leetcode Solution156
774Largest Rectangle in Histogram LeetCode Solution156
775Special Array With X Elements Greater Than or Equal X Leetcode Solution156
776Final Prices With a Special Discount in a Shop Leetcode Solution156
777Elements to be added so that all elements of a range are present in array156
778Symmetric Tree Leetcode Solution156
779Find All Duplicates in an Array LeetCode Solution156
780Check If Array Pairs Are Divisible by k LeetCode Solution156
781Split a String in Balanced Strings Leetcode Solution155
782Program for Bridge and Torch problem155
783Jump Game155
784Count items common to both the lists but with different prices155
785Largest rectangular sub-matrix whose sum is 0155
786Search a 2D Matrix II Leetcode Solution155
787Find Median from Data Stream LeetCode Solution155
788Evaluate Reverse Polish Notation LeetCode Solution155
789k-th missing element in increasing sequence which is not present in a given sequence155
790N-Queens LeetCode Solution154
791Course Schedule II – LeetCode154
792Number of NGEs to the Right154
793Minimum Jumps to Reach Home LeetCode Solution154
794Search in a Binary Search Tree Leetcode Solution154
795Base 7 Leetcode Solution154
796Circular Queue154
797Print a Binary Tree in Vertical Order154
798Maximum Difference Between Increasing Elements LeetCode Solution154
799Deletion in a Binary Tree154
800Longest Subarray Having Count of 1s One More than Count of 0s154
801Valid Number154
802Interval Tree154
803Growable array based stack154
804Sort an array according to the order defined by another array154
805Check for Palindrome after every character replacement Query154
806Transpose Graph154
807Remove Duplicates from Sorted List II153
808Sort Array By Parity II Leetcode Solution153
809Minimum swaps to make sequences increasing153
810Reorder Data in Log Files LeetCode Solution153
811Number Complement Leetcode Solution153
812Last Stone Weight II LeetCode Solution153
813Minimum number of jumps to reach end153
814Get Maximum in Generated Array Leetcode Solution153
815Merge Sorted Array LeetCode Solution153
816Nested List Weight Sum II LeetCode Solution153
817One Edit Distance LeetCode Solution153
818Count quadruples from four sorted arrays whose sum is equal to a given value x153
819Nearest Exit from Entrance in Maze LeetCode Solution153
820Minimum Time Visiting All Points Leetcode Solution153
821String comparison containing wildcards153
822Spiral Matrix II Leetcode Solution153
823Regular Expression Matching152
824Subarray Product Less Than K LeetCode Solution152
825Iterative Preorder Traversal152
826Find all triplets with zero sum152
827Crawler Log Folder Leetcode Solution152
828Remove Duplicates from Sorted List LeetCode Solution152
829Convert BST to Min Heap152
830Maximum size subarray sum equals k152
831A Space Optimized DP solution for 0-1 Knapsack Problem152
832Priority Queue using doubly linked list152
833Relative Ranks Leetcode Solution152
834Maximum Profit in Job Scheduling Leetcode Solution152
835Insert into a Binary Search Tree Leetcode Solution151
836Form Minimum Number From Given Sequence151
837Maximum Nesting Depth of the Parentheses Leetcode Solution150
838Can Place Flowers LeetCode Solution150
839Sort Colors150
840Find Maximum Sum Possible Equal Sum of Three Stacks150
841Valid Parentheses Leetcode Solution150
842Level order Traversal in Spiral Form150
843Given an Array of Pairs Find all Symmetric Pairs in it150
844Path with maximum average value150
845Check if a given array can represent Preorder Traversal of Binary Search Tree150
846Minimum Swaps to Make Strings Equal Leetcode Solution150
847Sum of nearest smaller and greater number150
848Partition List Leetcode Solution150
849Top K Frequent Words LeetCode Solution150
850Find the subarray with least average150
851Friends Pairing Problem150
852Brick Wall LeetCode Solution150
853Make Two Arrays Equal by Reversing Sub-arrays Leetcode Solution150
854Binary Search Tree Search and Insertion150
855Subset with sum divisible by m150
856Alien Dictionary LeetCode Solution150
857Minimum Number of Taps to Open to Water a Garden LeetCode Solution150
858Design a Stack With Increment Operation Leetcode Solution150
859Brightest Position on Street LeetCode Solution149
860Range LCM Queries149
861Balanced Expression with Replacement149
862Subsequence of Size K With the Largest Even Sum LeetCode Solution149
863Identify and Mark Unmatched Parenthesis in an Expression149
864Guess Number Higher or Lower LeetCode Solution149
865Check whether a given Binary Tree is Complete or not149
866Clone Graph LeetCode Solution149
867Permutation Coefficient149
868Tree Traversal (Preorder, Inorder & Postorder)149
869Count Distinct Elements in Every Window of Size K149
870LCS (Longest Common Subsequence) of three strings149
871Matrix Chain Multiplication149
872Count Negative Numbers in a Sorted Matrix LeetCode Solution149
873Find All Possible Recipes from Given Supplies LeetCode Solution149
874Missing Element in Sorted Array LeetCode Solution149
875Number of Days Between Two Dates LeetCode Solution149
876Minimum Sum Path in a Triangle149
877Sorted Array to Balanced BST149
878Union and Intersection of two Linked Lists148
879Count ways to reach the nth stair using step 1, 2 or 3148
880Destination City Leetcode Solution148
881Find the Only Repetitive Element Between 1 to N-1148
882Sequences of given length where every element is more than or equal to twice of previous148
883Time Based Key-Value Store LeetCode Solution148
884Check if stack elements are pairwise consecutive148
885Best Time to Buy and Sell Stock with Transaction Fee Leetcode Solution148
886Diagonal Traverse LeetCode Solution148
887An Interesting Method to generate Binary Numbers from 1 to n148
888Find Common Characters Leetcode Solution148
889Range sum queries without updates148
890Repeated Substring Pattern LeetCode Solution148
891GCDs of given index ranges in an array148
892BFS for Disconnected Graph147
893Convert Sorted List to Binary Search Tree147
894Distinct adjacent elements in an array147
895Guess Number Higher or Lower II147
896Diagonal Traversal LeetCode Solution147
897Three way partitioning of an array around a given range147
898Averages of Levels in Binary Tree147
899Design Browser History LeetCode Solution147
900Find distance between two nodes of a Binary Tree147
901Water Bottles Leetcode Solution147
902Shortest Word Distance Leetcode Solution147
903K’th Largest Element in BST when modification to BST is not allowed147
904Spiral Matrix III LeetCode Solution147
905Insert Delete GetRandom147
906Check if an Array is Stack Sortable147
907Delete And Earn147
908Rearrange an Array Such that arr[i] is equal to i147
909Maximum Score After Splitting a String Leetcode Solution146
910Queue using Stacks146
911Set Matrix Zeroes Leetcode Solution146
912Construct Complete Binary Tree from its Linked List Representation146
913Vertical sum in a given binary tree146
914Daily Temperatures Leetcode Solution146
915Rearrange Spaces Between Words Leetcode Solution146
916Robot Bounded In Circle LeetCode Solution146
917Lemonade Change Leetcode Solution146
918Special Positions in a Binary Matrix Leetcode Solution146
919Minimum sum of multiplications of n numbers146
920Alien Dictionary145
921Least Number of Unique Integers after K Removals Leetcode Solution145
922Number of Distinct Islands Leetcode Solution145
923Construct the Rectangle Leetcode Solution145
924Iterative Postorder Traversal Using Two Stacks145
925Rearrange Array such that arr[i] >= arr[j] if i is even and arr[i] <= arr[j] if i is odd and j < i145
926Find all permuted rows of a given row in a matrix145
927Check if the given array can represent Level Order Traversal of Binary Search Tree145
928Merge Two Sorted Lists Leetcode144
929Count Subarrays with Same Even and Odd Elements144
930Construct BST from its given Level Order Traversal144
931Print Fibonacci sequence using 2 variables144
932Maximum Subarray Sum Excluding Certain Elements144
933Split Array Into Consecutive Subsequences144
934A program to check if a binary tree is BST or not144
9354Sum144
936Largest area rectangular sub-matrix with equal number of 1’s and 0’s144
937Binary Tree Longest Consecutive Sequence LeetCode Solution144
9383 Sum144
939Palindrome Partitioning Leetcode Solution144
940Strongly Connected Component143
941Longest Palindromic Subsequence143
942Median of Two Sorted Arrays143
943Lexicographical Numbers Leetcode Solution143
944Create Maximum Number143
945Minimum Height Trees LeetCode Solution143
946Sliding Window Maximum143
947Remove Duplicates from Sorted List II LeetCode Solution143
948Number of Equivalent Domino Pairs Leetcode Solution143
949Check if any two intervals overlap among a given set of intervals143
950Stone Game II Leetcode143
951Queries for GCD of all numbers of an array except elements in a given range143
952Difference Array | Range update query in O(1)143
953Maximum Frequency Stack Leetcode Solution143
954Trim a Binary Search Tree142
955My Calendar I LeetCode Solution142
956Three Consecutive Odds Leetcode Solution142
957Collect maximum points in a grid using two traversals142
958All Unique Triplets that Sum up to a Given Value142
959Maximize Sum of Array after K Negations Leetcode Solution142
960Infix to Postfix142
961Can Make Arithmetic Progression From Sequence Leetcode Solution142
962Analyze User Website Visit Pattern LeetCode Solution142
963Dividing Array into Pairs With Sum Divisible by K142
964Merging Intervals141
965Shuffle 2n integers as a1-b1-a2-b2-a3-b3-..bn without using extra space141
966Minesweeper LeetCode Solution141
967Unique Paths II141
968Count Primes in Ranges141
969Kth Smallest Element in a BST Leetcode Solution141
970Binary array after M range toggle operations141
971Count Submatrices With All Ones LeetCode Solution141
972Maximum Product Subarray141
973Find postorder traversal of BST from preorder traversal141
974Pattern Occurrences using Stack140
975Longest Nice Substring LeetCode Solution140
976Count subarrays where second highest lie before highest140
977Boundary Traversal of binary tree140
978K Closest Points to Origin Leetcode Solution140
979Height of a generic tree from parent array140
980Count pair with Given Sum140
981Find the Difference Leetcode Solution140
982Symmetric Tree140
983Find Maximum of Minimum for Every Window Size in a Given Array140
984Sign of the Product of an Array LeetCode Solution140
985Intersection of Two Linked Lists LeetCode Solution140
986The Painter’s Partition Problem140
987Word Break140
988Length of Longest Fibonacci Subsequence140
989Reverse Nodes in K-Group140
990Largest divisible pairs subset139
991Binary Search Tree Delete Operation139
992Asteroid Collision LeetCode Solution139
993Newman-Conway Sequence139
994Product of Array Except Self LeetCode Solution139
995Maximum length subsequence with difference between adjacent elements as either 0 or 1139
996Level Order Traversal of Binary Tree139
997Largest Number Leetcode Solution139
998Friends Of Appropriate Ages LeetCode Solution139
999Palindrome Partitioning139
1000Valid Boomerang Leetcode Solution139
1001Check If a Word Occurs As a Prefix of Any Word in a Sentence Leetcode Solution139
1002Climbing stairs139
1003Number Of Longest Increasing Subsequence138
1004Breadth First Search (BFS) for a Graph138
1005Merge Sort138
1006Segment Tree138
1007Minimum Index Sum of Two Lists138
1008Find number of pairs in an array such that their XOR is 0138
1009Insertion in a Binary Tree138
1010Shortest Completing Word Leetcode Solution138
1011Find Duplicate Subtrees138
1012Maximum Number of Ways to Partition an Array LeetCode Solution138
1013Scramble String LeetCode Solution138
1014Boolean Parenthesization Problem138
1015Maximum subsequence sum such that no three are consecutive138
1016Maximum Length of Repeated Subarray138
1017Graph Valid Tree LeetCode Solution138
1018Double the first element and move zero to end138
1019Largest Substring Between Two Equal Characters Leetcode Solution138
1020Construction of Longest Increasing Subsequence (N log N)138
1021The Maze III LeetCode Solution138
1022Ugly Numbers137
1023Depth First Search (DFS) for a Graph137
1024Kill Process LeetCode Solution137
1025Construct Binary Tree from given Parent Array representation137
1026Maximum Product of Indexes of Next Greater on Left and Right137
1027Rearrange array such that even positioned are greater than odd137
1028Longest subsequence such that difference between adjacents is one137
1029Number of palindromic paths in a matrix137
1030Binary Search Tree137
1031Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’137
1032Maximum Sum of 3 Non-Overlapping Subarrays137
1033Decrypt String from Alphabet to Integer Mapping Leetcode Solution137
1034Compute nCr % p137
1035Find the First Circular Tour that visits all the Petrol Pumps137
1036String Matching in an Array Leetcode Solution137
1037Next Greater Element III LeetCode Solution136
1038Partition Equal Subset Sum136
1039Count minimum steps to get the given desired array136
1040Make The String Great Leetcode Solution136
1041Iterative Depth First Traversal of Graph136
1042Morris Inorder Traversal136
1043Serialize and Deserialize Binary Tree136
1044Build an Array With Stack Operations Leetcode Solution136
1045K maximum sums of overlapping contiguous sub-arrays136
1046Level order traversal using two Queues136
1047Maximum weight transformation of a given string136
1048First missing positive136
1049Custom Sort String Leetcode Solution135
1050Design Hit Counter LeetCode Solution135
1051Invalid Transactions LeetCode Solution135
1052Add two numbers135
1053Balanced Binary Tree135
1054Bitwise AND of Numbers Range LeetCode Solution135
1055Advantages of BST over Hash Table135
1056Maximum difference between frequency of two elements such that element having greater frequency is also greater135
1057Kth Smallest Element in a Sorted Matrix LeetCode Solution134
1058Count pairs from two sorted arrays whose sum is equal to a given value x134
1059Employee Importance LeetCode Solution134
1060Available Captures for Rook Leetcode Solution134
1061Path Sum II LeetCode Solution134
1062Validate Binary Search Tree134
1063Move all negative elements to end in order with extra space allowed133
1064Recover Binary Search Tree Leetcode Solution133
1065Minimum Size Subarray Sum133
1066Super Ugly Number133
1067Ugly Number II LeetCode Solution133
1068Rearrange array such that even index elements are smaller and odd index elements are greater133
1069Defanging an IP Address LeetCode Solution133
1070Lowest Common Ancestor133
1071Determine Whether Matrix Can Be Obtained By Rotation LeetCode Solution133
1072Generate Parentheses Leetcode Solution133
1073Implement Trie (Prefix Tree) Leetcode Solution133
1074Largest BST Subtree LeetCode Solution132
1075Find whether a subarray is in form of a mountain or not132
1076Find Peak Element132
1077Remove Duplicates from Sorted Array II Leetcode Solution132
1078Populating Next Right Pointers in Each Node Leetcode Solution132
1079Find a Peak Element II LeetCode Solution132
1080Regular Expression Matching Regular Expression Matching LeetCode Solution132
1081Subarrays with K Different Integers Leetcode Solution132
1082Number of Closed Islands Leetcode Solution132
1083Search in Sorted Rotated Array132
1084Binary Tree Right Side View LeetCode Solution132
1085Root to Leaf path with target sum Leetcode Solutions132
1086Types of Binary Tree131
1087Smallest Common Region Leetcode Solution131
1088Find Smallest Range Containing Elements from k Lists131
1089Count Largest Group Leetcode Solution131
1090Combination Sum IV LeetCode Solution131
1091Number of Students Doing Homework at a Given Time Leetcode Solution131
1092Day of the Year Leetcode Solution131
1093Remove Palindromic Subsequences Leetcode Solution131
1094Longest Bitonic Subsequence131
1095Kth Smallest Product of Two Sorted Arrays LeetCode Solution130
1096Consecutive Characters LeetCode Solution130
1097Maximize Distance to Closest Person LeetCode Solution130
1098Clone a Binary Tree with Random Pointers130
1099Print all triplets in sorted array that form AP130
1100Binary Tree Data Structure130
1101Minimum Absolute Difference in BST Leetcode Solution130
1102Number of siblings of a given Node in n-ary Tree130
1103Serialize and Deserialize Binary Tree LeetCode Solution130
1104Palindrome Permutation LeetCode Solution129
1105Cutting a Rod129
1106Remove duplicates from sorted array129
1107Print Next Greater Number of Q queries129
1108Path Sum129
1109Distinct Subsequences129
1110Sum of Even Numbers After Queries129
1111Next Permutation Leetcode Solution129
1112Convert BST into a Min-Heap without using array129
1113Increasing Triplet Subsequence LeetCode Solution129
1114Find maximum difference between nearest left and right smaller elements129
1115Level of Each node in a Tree from source node129
1116Construct K Palindrome Strings LeetCode Solution129
1117Find the minimum distance between two numbers129
1118Mean of Array After Removing Some Elements Leetcode Solution128
1119Minimum sum of squares of character counts in a given string after removing k characters128
1120Construct Binary Tree from Preorder and Postorder Traversal LeetCode Solution128
1121Third Maximum Number Leetcode Solution128
1122Maximum Product Subarray128
1123Iterative method to find ancestors of a given binary tree128
1124Reformat The String Leetcode Solution128
1125Find Three Element From Different Three Arrays Such That a + b + c = sum128
1126Constant time range add operation on an array128
1127Valid Tic-Tac-Toe State LeetCode Solution128
1128Divisible Pairs Counting128
1129Bottom View of a Binary Tree128
1130Longest Increasing Consecutive Subsequence127
1131Write Code to Determine if Two Trees are Identical127
1132Prime Palindrome LeetCode Solution127
1133Products of ranges in an array127
1134Longest Subarray of 1’s After Deleting One Element LeetCode Solution127
1135Print Right View of a Binary Tree127
1136Maximum Product of Splitted Binary Tree LeetCode Solution127
1137Thousand Separator Leetcode Solution127
1138Minimum Score Triangulation of Polygon Leetcode Solution127
1139Delete Nodes and Return Forest Leetcode Solution127
1140Moser-de Bruijn Sequence126
1141Search Insert Position126
1142Find maximum length Snake sequence126
1143Queries for Number of Distinct Elements in a Subarray126
1144Cells with Odd Values in a Matrix LeetCode Solution126
1145Search an Element in Sorted Rotated Array126
1146Palindromic Substrings Leetcode Solution126
1147Maximum Binary Tree125
1148Topological Sorting125
1149Subset Sum Problem in O(sum) space125
1150Swap Nodes In Pairs125
1151Merge two BSTs with limited extra space125
1152Red-Black Tree Introduction125
1153Maximize sum of consecutive differences in a circular array124
1154Find Two Non-overlapping Sub-arrays Each With Target Sum LeetCode Solution124
1155Diameter of N-Ary Tree LeetCode Solution124
1156Print modified array after executing the commands of addition and subtraction124
1157Transform a BST to Greater sum Tree124
1158Check Array Formation Through Concatenation Leetcode Solution124
1159Priority Queue124
1160Closest Binary Search Tree Value Leetcode Solution124
1161Possible Bipartition LeetCode Solution123
1162Web Crawler LeetCode Solution123
1163Bus Routes Leetcode Solution123
1164Remove Max Number of Edges to Keep Graph Fully Traversable Leetcode Solution123
1165Golomb sequence123
1166Search Suggestions System LeetCode Solution123
1167Find Largest Value in Each Tree Row LeetCode Solution123
1168Minimum Sideway Jumps LeetCode Solution123
1169Kth Smallest Number in Multiplication Table Leetcode Solution123
1170K’th Largest element in BST using constant extra space122
1171Find the smallest binary digit multiple of given number122
1172Decision Tree122
1173Rotate Array122
1174Find a sorted subsequence of size 3 in linear time122
1175Count even length binary sequences with same sum of first and second half bits122
1176Minimum Cost to Move Chips to The Same Position LeetCode Solution122
1177Compare Strings by Frequency of the Smallest Character Leetcode Solution122
1178Binary Tree to Binary Search Tree Conversion122
1179Longest Repeated Subsequence122
1180Minimum Moves to Equal Array Elements LeetCode Solution122
1181Swapping Nodes in a Linked List Leetcode Solution121
1182First Bad Version121
1183Graph and its representation121
1184Factorial Trailing Zeroes LeetCode Solution121
1185Given a binary tree, how do you remove all the half nodes?121
1186Decrease Elements To Make Array Zigzag LeetCode Solution121
1187Matchsticks to Square Leetcode Solution121
1188Reformat Date LeetCode Solution120
1189Queue Reconstruction by Height120
1190Maximum sum of pairs with specific difference120
1191Lowest Common Ancestor in Binary Search Tree120
1192Convert Sorted Array to Binary Search Tree LeetCode Solutions120
1193Maximum number of segments of lengths a, b and c120
1194Number of Orders in the Backlog Leetcode Solution120
1195Contiguous Array LeetCode Solution120
1196Count Pairs Whose Products Exist in Array120
1197Reverse a Path in BST using Queue120
1198Sum of Left Leaves LeetCode Solution119
1199Valid Triangle Number119
1200Closest Leaf in a Binary Tree LeetCode Solution119
1201Maximum sum bitonic subarray119
1202Path Crossing Leetcode Solution119
1203Maximum Depth Of Binary Tree119
1204How to print maximum number of A’s using given four keys119
1205Range Queries for Longest Correct Bracket Subsequence119
1206BST to a Tree with Sum of all Smaller Keys118
1207Champagne Tower LeetCode Solution118
1208Minimum Swaps To Make Sequences Increasing LeetCode Solution118
1209Lowest Common Ancestor of a Binary Tree Leetcode Solution118
1210Moving Stones Until Consecutive Leetcode Solution118
1211Filter Restaurants by Vegan-Friendly, Price and Distance Leetcode Solution117
1212Array Queries for multiply replacements and product117
1213Write a function to get the intersection point of two Linked Lists117
1214Perfect Squares LeetCode Solution117
1215LRU Cache Leetcode Solution117
1216Divide Two Integers Leetcode Solution117
1217Kth Smallest Element in a BST117
1218Concatenation of Array LeetCode Solution117
1219Integer Break LeetCode Solution117
1220Guess The Word117
1221Convert Integer to the Sum of Two No-Zero Integers Leetcode Solution116
1222Maximum sum of a path in a Right Number Triangle116
1223Maximum Value at a Given Index in a Bounded Array LeetCode Solution116
1224Sliding Window Median Leetcode Solution116
1225Replace two consecutive equal values with one greater116
1226Flatten 2D Vector LeetCode Solution116
1227Check if all levels of two Binary Tree are anagrams or not116
1228Queries on Probability of Even or Odd Number in given Ranges116
1229Valid Perfect Square LeetCode Solution116
1230New 21 Game115
1231Maximize Elements Using Another Array115
1232Arithmetic Slices II – Subsequence LeetCode Solution115
1233Maximum Array from Two given Arrays Keeping Order Same115
1234Range Sum Query using Sparse Table115
1235Power of Two115
1236The kth Factor of n Leetcode Solution114
1237Bold Words in String LeetCode Solution114
1238Check Completeness of a Binary Tree LeetCode Solution114
1239Check for Identical BSTs without building the trees114
1240Longest Common Prefix Using Word by Word Matching114
1241Check if each internal node of a BST has exactly one child114
1242Find Minimum in Rotated Sorted Array II LeetCode Solution114
1243Graph Cloning114
1244Design Skiplist LeetCode Solution114
1245Mean of range in array114
1246Print modified array after multiple array range increment operations113
1247Contiguous Array113
1248Maximum Product Subarray113
1249Largest Plus Sign Leetcode Solution113
1250Count Subsets Having Distinct Even Numbers113
1251Parallel Courses II LeetCode Solution113
1252Find k-th smallest element in BST (Order Statistics in BST)113
1253Print Ancestors of a Given Binary Tree Node Without Recursion112
1254Find minimum number of merge operations to make an array palindrome112
1255Print n terms of Newman-Conway Sequence112
1256Symmetric Tree LeetCode Solution Leetcode Solution112
1257Missing Number111
1258Image Overlap LeetCode Solution111
1259Minimum Remove to Make Valid Parentheses LeetCode Solution111
1260Merge k Sorted Lists Leetcode Solution111
1261Excel Sheet Column Title LeetCode Solution110
1262Number of elements less than or equal to a given number in a given subarray110
1263Verify Preorder Serialization of a Binary Tree110
1264Count and Toggle Queries on a Binary Array110
1265Smallest Range II Leetcode Solution110
1266Check if two nodes are on the same path in a Tree110
1267Next greater element109
1268Orderly Queue LeetCode Solution108
1269Check If a String Can Break Another String Leetcode Solution108
1270Palindrome Partitioning108
1271Minimum Time to Collect All Apples in a Tree LeetCode Solution108
1272Min Cost Climbing Stairs LeetCode Solution107
1273Different Ways to Add Parentheses Leetcode Solution107
1274Koko Eating Bananas LeetCode Solution107
1275Largest Submatrix With Rearrangements LeetCode Solution106
1276Longest Substring Without Repeating Characters Leetcode Solution106
1277Peeking Iterator LeetCode Solution106
1278Check if X can give change to every person in the Queue105
1279Newman–Shanks–Williams prime105
1280Check in binary array the number represented by a subarray is odd or even105
1281Queries for Decimal Values of Subarrays of a Binary Array104
1282Merge Sorted Array104
1283Range Minimum Query (Square Root Decomposition and Sparse Table)103
1284Encoded String With Shortest Length LeetCode Solution102
1285Array Nesting Leetcode Solution102
1286Arranging Coins Leetcode Solution101
1287Maximum Sum Increasing Subsequence101
1288Find maximum average subarray of k length101
1289Check given array of size n can represent BST of n levels or not100
1290Convert a BST to a Binary Tree such that sum of all greater keys is added to every key100
1291Maximum product of an increasing subsequence100
1292Number of indexes with equal elements in given range100
1293Minimum Total Space Wasted With K Resizing Operations LeetCode Solution99
1294Convert to Base -2 LeetCode Solution99
1295Random Pick Index LeetCode Solution98
1296Continuous Subarray Sum LeetCode Solution98
1297Minimum Number of People to Teach LeetCode Solution98
1298Find the Winner of the Circular Game LeetCode Solution98
1299Binary Tree to Binary Search Tree Conversion using STL set97
1300Add Two Numbers II Leetcode Solution97
1301Jump Game IV LeetCode Solution97
1302Reach a Number LeetCode Solution97
1303Vertical Order Traversal of Binary Tree LeetCode Solution96
1304Palindrome Number LeetCode Solution95
1305Queries on XOR of greatest odd divisor of the range95
1306Number of Subsequences That Satisfy the Given Sum Condition LeetCode solution95
1307Minimum Possible Integer After at Most K Adjacent Swaps On Digits LeetCode Solution94
1308Insert Delete GetRandom O(1) Leetcode Solution94
1309Design Underground System Leetcode Solution90
1310Print Maximum Length Chain of Pairs89
1311Detect Capital Leetcode Solution88
1312Design A Leaderboard Leetcode Solution87
1313Shifting Letters LeetCode Solution85
1314Substring with Concatenation of All Words Leetcode Solution84
1315Top K Frequent Elements LeetCode Solution83
1316Minimum Swaps to Group All 1’s Together Leetcode Solution83
1317Count Sub Islands LeetCode Solution82
1318Binary Tree Inorder Traversal LeetCode Solution81
1319Minimum Path Sum Leetcode Solution81
1320Longest Common Subsequence LeetCode Solution78
1321Odd Even Linked List Leetcode Solution77
1322Maximum Population Year LeetCode Solution77
1323Decode String Leetcode Solution76
1324Find the Town Judge LeetCode Solution76
1325Best Meeting Point LeetCode Solution76
1326Find the Town Judge LeetCode Solution76
1327Shortest Unsorted Continuous Subarray LeetCode Solution75
1328Sum Root to Leaf Numbers LeetCode Solution74
1329Maximum Population Year LeetCode Solution71
1330Rectangle Overlap LeetCode Solution71
1331Design Add and Search Words Data Structure LeetCode Solution71
1332Flatten Binary Tree to Linked List LeetCode Solution69
1333Score of Parenthesis LeetCode Solution68
1334Stone Game IV LeetCode Solution67
1335Insert into a Sorted Circular Linked List LeetCode Solution67
1336Range Sum Query 2D – Immutable LeetCode Solution66
1337Reveal Cards In Increasing Order Leetcode Solution65
1338Valid Triangle Number LeetCode Solution64
1339Is Graph Bipartite? LeetCode Solution63
1340Divide Chocolate LeetCode Solution57
1341Step-By-Step Directions From a Binary Tree Node to Another LeetCode Solution52
1342Reverse Integer Leetcode Solution47
1343Range Sum of BST LeetCode Solution46
1344Sort Colors LeetCode Solution43
1345Find K Closest Elements LeetCode Solution43
1346Maximum Side Length of a Square with Sum Less than or Equal to Threshold LeetCode Solution40
1347Rotate String LeetCode Solution40
1348Excel Sheet Column Number LeetCode Solution39
1349H-Index Leetcode Solution20
1350Maximum Size Subarray Sum Equals k Leetcode Solution20
1351High Five LeetCode Solution19
1352Camelcase Matching Leetcode Solution16
1353Monotonic Array Leetcode Solution15
1354Group Shifted Strings Leetcode Solution13
1355Insert Delete GetRandom O(1) – Duplicates allowed LeetCode Solution12
1356Unique Binary Search Trees LeetCode Solution11
1357Peak Index in a Mountain Array LeetCode Solution11
1358Valid Triangle Number LeetCode Solution10
1359Isomorphic Strings LeetCode Solution9
1360Swim in Rising Water LeetCode Solution7
1361Next Greater Element I Leetcode Solution4
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