Is Graph Bipartite? LeetCode Solution

Difficulty Level Medium
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Problem Statement

Is Graph Bipartite LeetCode Solution- There is an undirected graph with n nodes, where each node is numbered between 0 and n - 1. You are given a 2D array graph, where graph[u] is an array of nodes that node u is adjacent to. More formally, for each v in graph[u], there is an undirected edge between node u and node v. The graph has the following properties:

  • There are no self-edges (graph[u] does not contain u).
  • There are no parallel edges (graph[u] does not contain duplicate values).
  • If v is in graph[u], then u is in graph[v] (the graph is undirected).
  • The graph may not be connected, meaning there may be two nodes u and v such that there is no path between them.

A graph is bipartite if the nodes can be partitioned into two independent sets A and B such that every edge in the graph connects a node in the set A and a node in the set B.

Return true if and only if it is bipartite.

Is Graph Bipartite? LeetCode SolutionPin

Input: graph = [[1,2,3],[0,2],[0,1,3],[0,2]]
Output: false
Explanation: There is no way to partition the nodes into two independent sets such that every edge connects a node in one and a node in the other.

Is Graph Bipartite? LeetCode SolutionPin

Input: graph = [[1,3],[0,2],[1,3],[0,2]]
Output: true
Explanation: We can partition the nodes into two sets: {0, 2} and {1, 3}.


A bipartite graph (or digraph) is a graph whose vertices can be divided into two disjoint and independent sets, that is every edge connects a vertex into one. Vertex sets and. are usually called the parts of the graph. This problem can be easily understood and solved by assuming that each node is a graph that can be colored blue(1), red(0), or none(-1). If after traversal we found even a single node has a different color then the graph is not a bipartite graph. Here we are using the fact that in a bipartite graph no 2 adjacent nodes will be colored with the same color (1 or 0 for example)

We will initialize a list of colors with 0 (by default). Next, we will assign each node with color, either: 1 or -1. Remember that in the bipartite graph, no two adjacent nodes can have the same color.
If we caught two adjacent nodes with the same color, we will return false immediately.


Is Graph Bipartite? C++ Leetcode Solution:

class Solution {
    bool checkIfBipartite(int current, vector<vector<int>> &graph, vector<int> &color) {
        if(color[current] == -1)
            color[current] = 1;
        for(auto it : graph[current]) {
            if(color[it] == -1) {
                color[it] = 1 - color[current];
                if(!checkIfBipartite(it, graph, color))
                    return false;
            } else if(color[it] == color[current])
                return false;
        return true;
    bool isBipartite(vector<vector<int>>& graph) {
        int n = graph.size();
        vector<int> color(n, -1);
        for(int i = 0; i < n; ++i) {
            if(!checkIfBipartite(i, graph, color))
                return false;
        return true;

Is Graph Bipartite? Java Leetcode Solution:

class Solution {
    private static boolean checkBipartite(int current, int[][] graph, int[] color) {
        if(color[current] == -1)
            color[current] = 1;
        for(int adj : graph[current]) {
            if(color[adj] == -1) {
                color[adj] = 1 - color[current];
                if(checkBipartite(adj, graph, color) == false)
                    return false;
            } else if(color[adj] == color[current]) 
                return false;
        return true;
    public boolean isBipartite(int[][] graph) {
        int n = graph.length;
        int color[] = new int[n];
        for(int i = 0; i < n; ++i) 
            color[i] = -1;
        for(int i = 0; i < n; ++i) {
            if(checkBipartite(i, graph, color) == false)
                return false;
        return true;

Complexity Analysis for Is Graph Bipartite Leetcode Solution:

Time Complexity

O(V+E) for doing the standard DFS approach.

Space Complexity

O(V) for storing the colors array and the auxiliary space required for recursion.

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558Best Time to Buy and Sell Stock172
559Trapping Rain Water LeetCode Solution171
560Distribute Candies to People Leetcode Solution171
561Minimum Operations to convert X to Y171
562Convert a normal BST to Balanced BST171
563Minimum Delete Operations to make all Elements of Array Same171
564Find Words That Can Be Formed by Characters Leetcode Solution171
565Minimum Bracket Reversals170
566Hamming Distance170
567Jewels and Stones Leetcode Solution170
568Arrange given numbers to form the biggest number170
569Remove Linked List Elements Leetcode Solution170
570Shuffle an Array170
571Count the number of nodes at given level in a tree using BFS170
572Assign Cookies Leetcode Solution169
573Rearrange a binary string as alternate x and y occurrences169
574Convert Sorted Array to Binary Search Tree Leetcode Solution169
575Integer to Roman169
576Count all subsequences having product less than K169
577The Knapsack Problem169
578Gold Mine Problem169
579Insert Interval Leetcode Solution169
580Find the smallest positive integer value that cannot be represented as sum of any subset of a given array168
581Group Multiple Occurrence of Array Elements Ordered by first Occurrence168
582Maximum path sum in a triangle168
583Change the Array into Permutation of Numbers From 1 to N168
584Summary Ranges Leetcode Solution168
585Shortest Path in a Grid with Obstacles Elimination LeetCode Solution168
5863Sum Closest LeetCode Solution168
587Check for Balanced Parentheses in an Expression168
588Minimum Knight Moves LeetCode Solution168
589Unique Binary Search Trees167
590XOR Operation in an Array Leetcode Solution167
591Decode Ways167
592Rotate List Leetcode Solution167
593Minimum number of distinct elements after removing m items167
594K Empty Slots LeetCode167
595Distance Between Bus Stops Leetcode Solution166
596Combinations Leetcode Solution166
597Rotate Image LeetCode Solution166
598Same Tree LeetCode Solution166
599How to check if two given sets are disjoint?166
600Sieve of Eratosthenes166
601LRU Cache LeetCode Solution166
602Permutation in String Leetcode Solution165
603Frog Jump Leetcode Solution165
604Sort Characters By Frequency LeetCode Solution165
605Find minimum difference between any two elements165
606Remove All Occurrences of a Substring LeetCode Solution165
607Maximum difference between first and last indexes of an element in array165
608Best Time to Buy and Sell Stock LeetCode Solution164
609Stone Game LeetCode164
610Replace Elements with Greatest Element on Right Side Leetcode Solution164
611Segregate 0s and 1s in an Array164
612Maximum Distance in Array164
613Find Sum of all unique sub-array sum for a given array164
614Painting Fence Algorithm164
615License Key Formatting Leetcode Solution164
616Printing brackets in Matrix Chain Multiplication Problem164
617Minimum number of subsets with distinct elements164
618Word Pattern164
619Smallest Good Base163
620Sort Array By Parity LeetCode Solution163
621Minimum insertions to form a palindrome with permutations allowed163
622Find if an Expression has Duplicate Parenthesis or Not163
623Minimum Depth of Binary Tree Leetcode Solution163
624Word Wrap Problem163
625Coin Change Problem162
626Applications of Breadth First Search and Depth First Search162
627Maximum Number of Chocolates to be Distributed Equally Among k Students162
628Defanging an IP Address Leetcode Solution162
629Find the Duplicate Number LeetCode Solution162
630Distance of nearest cell having 1 in a binary matrix162
631Valid Palindrome II Leetcode Solution161
632Kth Missing Positive Number Leetcode Solution161
633Minimum Cost to Hire K Workers161
634House Robber161
635Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest161
636Tracking current Maximum Element in a Stack161
637Sum of All Odd Length Subarrays Leetcode Solution160
638Binary Tree Zigzag Level Order Traversal LeetCode Solution160
639Optimal Account Balancing LeetCode Solution160
640Find Maximum Level sum in Binary Tree160
641Maximum Consecutive Numbers Present in an Array160
642Longest Substring with At Most K Distinct Characters LeetCode Solution160
643Longest Increasing Subsequence160
644Minimum Number of Steps to Make Two Strings Anagram Leetcode Solutions160
645Iterative Method to find Height of Binary Tree160
646Power of Four Leetcode Solution160
647Non-overlapping sum of two sets160
648Isomorphic Strings160
649Count Good Nodes in Binary Tree Leetcode Solution160
650Merge Two Balanced Binary Search Trees159
651K Empty Slots159
652Reverse a stack without using extra space in O(n)159
653GCD Of Two Numbers159
654Delete consecutive same words in a sequence159
655Moving Average from Data Stream Leetcode Solution159
656Best Time to Buy and Sell Stock with Cooldown Leetcode Solution159
657Check If It Is a Straight Line Leetcode Solution159
658Number of Provinces Leetcode Solution159
659Largest Sum Contiguous Subarray158
660Check If Two String Arrays are Equivalent Leetcode Solution158
661String to Integer (atoi) LeetCode Solution158
662Queries for counts of array elements with values in given range158
663Wiggle Sort158
664Ugly Number Leetcode Solution158
665Maximum Number of Coins You Can Get Leetcode Solution158
666Letter Combinations of a Phone Number158
667Strobogrammatic Number LeetCode Solution158
668Convert an array to reduced form158
669Longest Increasing Path in a Matrix LeetCode Solution157
670Subset Sum Leetcode157
671Find the Smallest Divisor given a Threshold Leetcode Solution157
672Reorganize String157
673Sum of f(a[i], a[j]) over all pairs in an array of n integers157
674Reducing Dishes LeetCode Solution157
675Employee Free Time LeetCode Solution157
676Print the Fibonacci numbers in reverse order157
677Longest Substring with At Least K Repeating Characters LeetCode Solution157
678Lucky Numbers in a Matrix Leetcode Solution157
679Partition Labels LeetCode Solution157
680Number of Dice Rolls With Target Sum LeetCode Solution157
681Find Largest d in Array such that a + b + c = d157
682Increasing Decreasing String Leetcode Solution157
683Flipping an Image LeetCode Solution157
684Reverse Only Letters LeetCode Solution157
685How to Create Mergable Stack?157
686Check if a queue can be sorted into another queue using a stack157
687Unique Paths II Leetcode Solution156
688Valid Palindrome156
689Path With Maximum Minimum Value LeetCode Solution156
690Find whether an array is subset of another array156
691Form minimum number from given sequence156
692Reversing a Queue using Recursion156
693Inorder Successor of a node in Binary Tree156
694Valid Perfect Square Leetcode Solution156
695Maximum Number of Occurrences of a Substring Leetcode Solution156
696Find Leaves of Binary Tree LeetCode Solution156
697Find the Distance Value Between Two Arrays Leetcode Solution156
698Reservoir Sampling155
699Construct BST from given Preorder Traversal155
700Populating Next Right Pointers in Each Node155
701Recover Binary Search Tree155
702Permutation Sequence LeetCode Solution155
703Binary Tree zigzag level order Traversal155
704Robot Room Cleaner Leetcode Solution155
705Merge Two Binary Trees LeetCode Solution155
706To Lower Case Leetcode Solution155
707Delete Nth node from the end of the given linked list155
708Partition Array Into Three Parts With Equal Sum Leetcode Solution155
709BFS vs DFS for Binary Tree155
710Find pairs with given sum such that elements of pair are in different rows154
711Majority Element II Leetcode Solution154
712Rank Transform of an Array Leetcode Solution154
713Maximum Product of Three Numbers LeetCode Solution154
714Find the node with minimum value in a Binary Search Tree154
715Sort Array by Increasing Frequency Leetcode Solution154
716Dynamic Programming Basics154
717Maximum Product of Two Elements in an Array Leetcode Solution154
718Add and Search Word – Data structure design LeetCode154
719Hamming Distance Leetcode Solution154
720Edit Distance LeetCode Solution154
721Decompress Run-Length Encoded List Leetcode Solution153
722Factorial Trailing Zeroes Leetcode Solution153
723Keyboard Row Leetcode Solution153
724Restore IP Addresses Leetcode Solution153
725Remove Invalid Parentheses Leetcode Solution153
726Numbers with prime frequencies greater than or equal to k153
727Convert a Number to Hexadecimal Leetcode Solution153
728String Compression LeetCode Solution152
729Stack Permutations (Check if an array is stack permutation of other)152
730Longest Span with same Sum in two Binary arrays152
731Queue based approach for first non-repeating character in a stream152
732Deletion in a Binary Tree152
733Bulb Switcher LeetCode Solution152
734Find Maximum Depth of Nested Parenthesis in a String151
735Minimum Height Trees151
736Find All Duplicates in an Array LeetCode Solution151
737Minimum Distance Between BST Nodes Leetcode Solution151
738Linked List Cycle151
739Race Car LeetCode Solution151
740Symmetric Tree Leetcode Solution151
741Find unique character in a string151
742Largest subarray with equal number of 0s and 1s151
743Find the largest multiple of 3151
744Non-decreasing Array LeetCode Solution151
745Binomial Coefficient150
746Best Meeting Point LeetCode Solution150
747Search in a Binary Search Tree Leetcode Solution150
748k-th missing element in increasing sequence which is not present in a given sequence150
749Maximum Length of a Concatenated String with Unique Characters Leetcode Solution150
750Minimum Cost For Tickets Leetcode Solution150
751Find if Path Exists in Graph Leetcode Solution150
752Perform String Shifts Leetcode150
753Minimize Maximum Pair Sum in Array LeetCode Solution150
754Word Pattern LeetCode Solution150
755Bubble sort using two Stacks150
756Sorted Linked List to Balanced BST150
757Remove Duplicates from Sorted List LeetCode Solution150
758Remove Nth Node From End of List Leetcode Solution150
759Binary Tree Maximum Path Sum LeetCode Solution150
760Find Pair with Greatest Product in Array150
761Maximum 69 Number Leetcode Solution150
762First Unique Character in a String LeetCode Solution150
763Invert Binary Tree LeetCode Solution150
764Generate all possible sorted arrays from alternate elements of two given sorted arrays150
765Check If Array Pairs Are Divisible by k LeetCode Solution150
766Diagonal Traversal of Binary Tree149
767Count quadruples from four sorted arrays whose sum is equal to a given value x149
768Student Attendance Record I Leetcode Solution149
769Kth ancestor of a node in binary tree149
770Jump Game149
771Search a 2D Matrix II Leetcode Solution149
772Maximum Difference Between Increasing Elements LeetCode Solution149
773Number of Islands II LeetCode Solution149
774Merge K Sorted Linked Lists149
775Find Median from Data Stream LeetCode Solution149
776Growable array based stack149
777Evaluate Reverse Polish Notation LeetCode Solution149
778Morris Traversal149
779Elements to be added so that all elements of a range are present in array149
780Finding K closest element149
781N-Queens LeetCode Solution149
782Snakes and Ladders LeetCode Solution148
783Largest rectangular sub-matrix whose sum is 0148
784Minimum time required to rot all oranges148
785Minimum Time Visiting All Points Leetcode Solution148
786Valid Number148
787Maximum Depth of N-ary Tree Leetcode Solution148
788Number Complement Leetcode Solution148
789Program for Bridge and Torch problem148
790Split a String in Balanced Strings Leetcode Solution148
791Remove brackets from an algebraic string containing + and – operators148
792Special Array With X Elements Greater Than or Equal X Leetcode Solution147
793Minimum number of jumps to reach end147
794Count items common to both the lists but with different prices147
795Get Maximum in Generated Array Leetcode Solution147
796Transpose Graph147
797Merge Sorted Array LeetCode Solution147
798Relative Ranks Leetcode Solution147
799Number of NGEs to the Right147
800Largest Rectangle in Histogram LeetCode Solution147
801Nested List Weight Sum II LeetCode Solution147
802Check for Palindrome after every character replacement Query147
803Sort an array according to the order defined by another array147
804Nearest Exit from Entrance in Maze LeetCode Solution147
805Remove Duplicates from Sorted List II147
806Longest Subarray Having Count of 1s One More than Count of 0s146
807Sort Colors146
808Minimum Number of Taps to Open to Water a Garden LeetCode Solution146
809Crawler Log Folder Leetcode Solution146
810Sort Array By Parity II Leetcode Solution146
811Tiling Problem146
812One Edit Distance LeetCode Solution146
813Partition to K Equal Sum Subsets Leetcode Solution146
814Final Prices With a Special Discount in a Shop Leetcode Solution146
815Friends Pairing Problem146
816String comparison containing wildcards146
817Print a Binary Tree in Vertical Order146
818Base 7 Leetcode Solution146
819Circular Queue146
820Convert BST to Min Heap146
821A Space Optimized DP solution for 0-1 Knapsack Problem146
822Subsequence of Size K With the Largest Even Sum LeetCode Solution145
823Alien Dictionary LeetCode Solution145
824Clone Graph LeetCode Solution145
825Interval Tree145
826Check if Two Expressions With Brackets are Same145
827Sorted Array to Balanced BST145
828Reorder Data in Log Files LeetCode Solution145
829Subarray Product Less Than K LeetCode Solution145
830Minimum swaps to make sequences increasing145
831Path with maximum average value145
832Make Two Arrays Equal by Reversing Sub-arrays Leetcode Solution144
833Maximum Profit in Job Scheduling Leetcode Solution144
834Level order Traversal in Spiral Form144
835Regular Expression Matching144
836Maximum size subarray sum equals k144
837Find the subarray with least average144
838Course Schedule II – LeetCode144
839Partition List Leetcode Solution144
840Design a Stack With Increment Operation Leetcode Solution144
841Minimum Swaps to Make Strings Equal Leetcode Solution144
842Insert into a Binary Search Tree Leetcode Solution144
843Last Stone Weight II LeetCode Solution144
844Priority Queue using doubly linked list144
845Minimum Jumps to Reach Home LeetCode Solution144
846Guess Number Higher or Lower LeetCode Solution144
847Iterative Preorder Traversal144
848Total Numbers With no Repeated Digits in a Range144
849Check if a given array can represent Preorder Traversal of Binary Search Tree143
850Find the Only Repetitive Element Between 1 to N-1143
851Minimum Sum Path in a Triangle143
852Permutation Coefficient143
853Union and Intersection of two Linked Lists143
854Top K Frequent Words LeetCode Solution143
855Subset with sum divisible by m143
856Brightest Position on Street LeetCode Solution143
857Count Distinct Elements in Every Window of Size K143
858Find all triplets with zero sum143
859Can Place Flowers LeetCode Solution143
860Valid Parentheses Leetcode Solution143
861Three way partitioning of an array around a given range142
862Find All Possible Recipes from Given Supplies LeetCode Solution142
863Check if an Array is Stack Sortable142
864Check whether a given Binary Tree is Complete or not142
865Given an Array of Pairs Find all Symmetric Pairs in it142
866Brick Wall LeetCode Solution142
867Maximum Nesting Depth of the Parentheses Leetcode Solution142
868Water Bottles Leetcode Solution142
869Sum of nearest smaller and greater number141
870Rearrange Spaces Between Words Leetcode Solution141
872Lemonade Change Leetcode Solution141
873Least Number of Unique Integers after K Removals Leetcode Solution141
874Tree Traversal (Preorder, Inorder & Postorder)141
875Repeated Substring Pattern LeetCode Solution141
876Range sum queries without updates141
877Form Minimum Number From Given Sequence141
878Spiral Matrix II Leetcode Solution141
879Matrix Chain Multiplication141
880LCS (Longest Common Subsequence) of three strings141
881Binary Search Tree Search and Insertion141
882Count ways to reach the nth stair using step 1, 2 or 3141
883Daily Temperatures Leetcode Solution141
884Design Browser History LeetCode Solution141
885Shortest Word Distance Leetcode Solution140
886Maximum Score After Splitting a String Leetcode Solution140
887Insert Delete GetRandom140
888Count Subarrays with Same Even and Odd Elements140
889Destination City Leetcode Solution140
890Delete And Earn140
891Construct Complete Binary Tree from its Linked List Representation140
892Count Negative Numbers in a Sorted Matrix LeetCode Solution140
893Guess Number Higher or Lower II140
894An Interesting Method to generate Binary Numbers from 1 to n140
895Distinct adjacent elements in an array140
896Best Time to Buy and Sell Stock with Transaction Fee Leetcode Solution140
897GCDs of given index ranges in an array140
898Find all permuted rows of a given row in a matrix140
899Diagonal Traversal LeetCode Solution139
900Rearrange an Array Such that arr[i] is equal to i139
901Check if stack elements are pairwise consecutive139
902Missing Element in Sorted Array LeetCode Solution139
903Find Maximum Sum Possible Equal Sum of Three Stacks139
904Balanced Expression with Replacement139
905Convert Sorted List to Binary Search Tree139
906A program to check if a binary tree is BST or not139
907Number of Days Between Two Dates LeetCode Solution139
908Identify and Mark Unmatched Parenthesis in an Expression139
909Sequences of given length where every element is more than or equal to twice of previous139
910Queries for GCD of all numbers of an array except elements in a given range139
911Robot Bounded In Circle LeetCode Solution139
912Set Matrix Zeroes Leetcode Solution139
913Alien Dictionary138
914Palindrome Partitioning Leetcode Solution138
915Time Based Key-Value Store LeetCode Solution138
916Vertical sum in a given binary tree138
917Special Positions in a Binary Matrix Leetcode Solution138
918Range LCM Queries138
919Diagonal Traverse LeetCode Solution138
920Find Common Characters Leetcode Solution138
921Check if the given array can represent Level Order Traversal of Binary Search Tree138
922Minimum sum of multiplications of n numbers138
923BFS for Disconnected Graph138
924Find distance between two nodes of a Binary Tree138
925Merging Intervals137
926Number of Distinct Islands Leetcode Solution137
927Stone Game II Leetcode137
928Spiral Matrix III LeetCode Solution137
929Merge Two Sorted Lists Leetcode137
930Remove Duplicates from Sorted List II LeetCode Solution137
931Rearrange Array such that arr[i] >= arr[j] if i is even and arr[i] <= arr[j] if i is odd and j < i137
932Longest Palindromic Subsequence137
933Number of Equivalent Domino Pairs Leetcode Solution136
934Sliding Window Maximum136
935Analyze User Website Visit Pattern LeetCode Solution136
936Maximum Frequency Stack Leetcode Solution136
937Intersection of Two Linked Lists LeetCode Solution136
938Construct the Rectangle Leetcode Solution136
939Infix to Postfix136
940Lexicographical Numbers Leetcode Solution136
941Print Fibonacci sequence using 2 variables136
942Maximize Sum of Array after K Negations Leetcode Solution136
9433 Sum136
944Can Make Arithmetic Progression From Sequence Leetcode Solution136
945Averages of Levels in Binary Tree136
946Queue using Stacks136
947K’th Largest Element in BST when modification to BST is not allowed136
948Three Consecutive Odds Leetcode Solution136
949Maximum Subarray Sum Excluding Certain Elements136
950Trim a Binary Search Tree135
951Pattern Occurrences using Stack135
952Dividing Array into Pairs With Sum Divisible by K135
953Difference Array | Range update query in O(1)135
954Minimum Height Trees LeetCode Solution135
955Construct BST from its given Level Order Traversal135
956Median of Two Sorted Arrays135
957All Unique Triplets that Sum up to a Given Value135
958Largest area rectangular sub-matrix with equal number of 1’s and 0’s135
959Binary array after M range toggle operations135
960Breadth First Search (BFS) for a Graph135
961Binary Tree Longest Consecutive Sequence LeetCode Solution135
962Count Submatrices With All Ones LeetCode Solution135
963Height of a generic tree from parent array134
964Find postorder traversal of BST from preorder traversal134
965Find Maximum of Minimum for Every Window Size in a Given Array134
966Palindrome Partitioning134
967Word Break134
968Largest Substring Between Two Equal Characters Leetcode Solution134
969Strongly Connected Component134
970Check If a Word Occurs As a Prefix of Any Word in a Sentence Leetcode Solution134
971Largest divisible pairs subset134
972Reverse Nodes in K-Group134
973Check if any two intervals overlap among a given set of intervals134
974Newman-Conway Sequence134
975Shuffle 2n integers as without using extra space133
976Create Maximum Number133
977Symmetric Tree133
978Binary Search Tree Delete Operation133
979Iterative Postorder Traversal Using Two Stacks133
980Depth First Search (DFS) for a Graph133
981Kth Smallest Element in a BST Leetcode Solution133
982Maximum Product Subarray133
983Split Array Into Consecutive Subsequences133
984Segment Tree133
985Product of Array Except Self LeetCode Solution133
986First missing positive133
987Asteroid Collision LeetCode Solution132
988Maximum subsequence sum such that no three are consecutive132
989Level Order Traversal of Binary Tree132
990Count pair with Given Sum132
991Sign of the Product of an Array LeetCode Solution132
992Count Primes in Ranges132
993Rearrange array such that even positioned are greater than odd132
994Boundary Traversal of binary tree132
995The Maze III LeetCode Solution132
996Length of Longest Fibonacci Subsequence132
997Find Duplicate Subtrees132
998Minesweeper LeetCode Solution132
999Climbing stairs132
1000My Calendar I LeetCode Solution132
1001Find the Difference Leetcode Solution131
1002Maximum Number of Ways to Partition an Array LeetCode Solution131
1003Longest Nice Substring LeetCode Solution131
1004Partition Equal Subset Sum131
1005Find the First Circular Tour that visits all the Petrol Pumps131
1006Kill Process LeetCode Solution131
1007Double the first element and move zero to end131
1008Longest subsequence such that difference between adjacents is one131
1009Serialize and Deserialize Binary Tree131
1010Decrypt String from Alphabet to Integer Mapping Leetcode Solution131
1011Make The String Great Leetcode Solution131
1012Level order traversal using two Queues130
1013Valid Boomerang Leetcode Solution130
1014Super Ugly Number130
1015Unique Paths II130
1016Maximum Length of Repeated Subarray130
1017Next Greater Element III LeetCode Solution130
1018Graph Valid Tree LeetCode Solution130
1019Shortest Completing Word Leetcode Solution130
1020Insertion in a Binary Tree130
1021The Painter’s Partition Problem130
1022Largest Number Leetcode Solution130
1023Find number of pairs in an array such that their XOR is 0130
1024Number Of Longest Increasing Subsequence129
1025K Closest Points to Origin Leetcode Solution129
1026Friends Of Appropriate Ages LeetCode Solution129
1027Compute nCr % p129
1028Binary Search Tree129
1029Advantages of BST over Hash Table129
1030Count subarrays where second highest lie before highest129
1031Ugly Number II LeetCode Solution129
1032Collect maximum points in a grid using two traversals129
1033Design Hit Counter LeetCode Solution129
1034Employee Importance LeetCode Solution128
1035Scramble String LeetCode Solution128
1036Implement Trie (Prefix Tree) Leetcode Solution128
1037Ugly Numbers128
1038Invalid Transactions LeetCode Solution128
1039Kth Smallest Element in a Sorted Matrix LeetCode Solution128
1040Defanging an IP Address LeetCode Solution128
1041Build an Array With Stack Operations Leetcode Solution128
1042String Matching in an Array Leetcode Solution128
1043Maximum Product of Indexes of Next Greater on Left and Right128
1044Construction of Longest Increasing Subsequence (N log N)128
1045Balanced Binary Tree128
1046Available Captures for Rook Leetcode Solution128
1047Move all negative elements to end in order with extra space allowed128
1048Number of palindromic paths in a matrix128
1049Construct Binary Tree from given Parent Array representation128
1050Morris Inorder Traversal128
1051Boolean Parenthesization Problem128
1052Minimum Size Subarray Sum128
1053Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’128
1054Maximum Sum of 3 Non-Overlapping Subarrays127
1055Count minimum steps to get the given desired array127
1056Maximum weight transformation of a given string127
1057Minimum Index Sum of Two Lists127
1058Regular Expression Matching Regular Expression Matching LeetCode Solution127
1059Longest Bitonic Subsequence127
1060Populating Next Right Pointers in Each Node Leetcode Solution127
1061Maximum length subsequence with difference between adjacent elements as either 0 or 1127
1062Add two numbers127
1063Maximum difference between frequency of two elements such that element having greater frequency is also greater127
1064Find Peak Element127
1065Find whether a subarray is in form of a mountain or not127
1066Iterative Depth First Traversal of Graph126
1067Validate Binary Search Tree126
1068Remove Duplicates from Sorted Array II Leetcode Solution126
1069Recover Binary Search Tree Leetcode Solution126
1070Generate Parentheses Leetcode Solution126
1071Find the minimum distance between two numbers126
1072Lowest Common Ancestor126
1073Bitwise AND of Numbers Range LeetCode Solution126
1074Custom Sort String Leetcode Solution126
1075Divisible Pairs Counting126
1076Find a Peak Element II LeetCode Solution126
1077Day of the Year Leetcode Solution125
1078Combination Sum IV LeetCode Solution125
1079Binary Tree Data Structure125
1080Path Sum II LeetCode Solution125
1081Number of Closed Islands Leetcode Solution125
1082Search in Sorted Rotated Array125
1083Binary Tree Right Side View LeetCode Solution125
1084Maximize Distance to Closest Person LeetCode Solution125
1085Smallest Common Region Leetcode Solution125
1086Largest BST Subtree LeetCode Solution125
1087Determine Whether Matrix Can Be Obtained By Rotation LeetCode Solution125
1088Subarrays with K Different Integers Leetcode Solution124
1089Next Permutation Leetcode Solution124
1090Consecutive Characters LeetCode Solution124
1091Clone a Binary Tree with Random Pointers124
1092Number of Students Doing Homework at a Given Time Leetcode Solution124
1093Level of Each node in a Tree from source node124
1094Rearrange array such that even index elements are smaller and odd index elements are greater124
1095Types of Binary Tree124
1096Remove Palindromic Subsequences Leetcode Solution124
1097Path Sum124
1098Increasing Triplet Subsequence LeetCode Solution124
1099Distinct Subsequences123
1100Number of siblings of a given Node in n-ary Tree123
1101Topological Sorting123
1102Print Next Greater Number of Q queries123
1103Print all triplets in sorted array that form AP123
1104Kth Smallest Product of Two Sorted Arrays LeetCode Solution123
1105Count pairs from two sorted arrays whose sum is equal to a given value x123
1106Serialize and Deserialize Binary Tree LeetCode Solution123
1107Find Smallest Range Containing Elements from k Lists123
1108Bottom View of a Binary Tree122
1109Constant time range add operation on an array122
1110Find maximum difference between nearest left and right smaller elements122
1111Cutting a Rod122
1112Remove duplicates from sorted array122
1113Root to Leaf path with target sum Leetcode Solutions122
1114Maximum Product Subarray122
1115Find Three Element From Different Three Arrays Such That a + b + c = sum121
1116Minimum Score Triangulation of Polygon Leetcode Solution121
1117Mean of Array After Removing Some Elements Leetcode Solution121
1118Convert BST into a Min-Heap without using array121
1119Third Maximum Number Leetcode Solution121
1120Maximum Binary Tree121
1121Print Right View of a Binary Tree121
1122Valid Tic-Tac-Toe State LeetCode Solution121
1123Construct Binary Tree from Preorder and Postorder Traversal LeetCode Solution121
1124Write Code to Determine if Two Trees are Identical121
1125Count Largest Group Leetcode Solution121
1126Longest Subarray of 1’s After Deleting One Element LeetCode Solution120
1127Iterative method to find ancestors of a given binary tree120
1128Products of ranges in an array120
1129Search an Element in Sorted Rotated Array120
1130Reformat The String Leetcode Solution120
1131Minimum sum of squares of character counts in a given string after removing k characters120
1132Queries for Number of Distinct Elements in a Subarray120
1133Golomb sequence120
1134Palindrome Permutation LeetCode Solution120
1135Search Insert Position120
1136Cells with Odd Values in a Matrix LeetCode Solution120
1137Prime Palindrome LeetCode Solution119
1138Minimum Absolute Difference in BST Leetcode Solution119
1139Longest Increasing Consecutive Subsequence119
1140Sum of Even Numbers After Queries119
1141Print modified array after executing the commands of addition and subtraction119
1142Moser-de Bruijn Sequence119
1143Closest Binary Search Tree Value Leetcode Solution119
1144Find a sorted subsequence of size 3 in linear time119
1145Construct K Palindrome Strings LeetCode Solution119
1146Red-Black Tree Introduction119
1147Thousand Separator Leetcode Solution119
1148Bus Routes Leetcode Solution118
1149Factorial Trailing Zeroes LeetCode Solution118
1150Find maximum length Snake sequence118
1151Binary Tree to Binary Search Tree Conversion118
1152Transform a BST to Greater sum Tree118
1153Maximum Product of Splitted Binary Tree LeetCode Solution118
1154Delete Nodes and Return Forest Leetcode Solution118
1155Merge two BSTs with limited extra space118
1156Number of Orders in the Backlog Leetcode Solution117
1157Count even length binary sequences with same sum of first and second half bits117
1158K’th Largest element in BST using constant extra space117
1159Decision Tree117
1160Find the smallest binary digit multiple of given number117
1161Check Array Formation Through Concatenation Leetcode Solution117
1162Kth Smallest Number in Multiplication Table Leetcode Solution117
1163K maximum sums of overlapping contiguous sub-arrays117
1164Possible Bipartition LeetCode Solution117
1165Longest Repeated Subsequence117
1166Palindromic Substrings Leetcode Solution117
1167Swap Nodes In Pairs117
1168Find Two Non-overlapping Sub-arrays Each With Target Sum LeetCode Solution117
1169Priority Queue116
1170Minimum Moves to Equal Array Elements LeetCode Solution116
1171Swapping Nodes in a Linked List Leetcode Solution116
1172Minimum Cost to Move Chips to The Same Position LeetCode Solution116
1173Subset Sum Problem in O(sum) space116
1174Compare Strings by Frequency of the Smallest Character Leetcode Solution116
1175Minimum Sideway Jumps LeetCode Solution116
1176Rotate Array116
1177Web Crawler LeetCode Solution116
1178Maximize sum of consecutive differences in a circular array116
1179Closest Leaf in a Binary Tree LeetCode Solution115
1180First Bad Version115
1181Search Suggestions System LeetCode Solution115
1182Find Largest Value in Each Tree Row LeetCode Solution115
1183Decrease Elements To Make Array Zigzag LeetCode Solution114
1184Diameter of N-Ary Tree LeetCode Solution114
1185Count Pairs Whose Products Exist in Array114
1186Remove Max Number of Edges to Keep Graph Fully Traversable Leetcode Solution114
1187Given a binary tree, how do you remove all the half nodes?114
1188Matchsticks to Square Leetcode Solution113
1189Kth Smallest Element in a BST113
1190Contiguous Array LeetCode Solution113
1191Maximum number of segments of lengths a, b and c113
1192Moving Stones Until Consecutive Leetcode Solution113
1193Queue Reconstruction by Height113
1194Reverse a Path in BST using Queue113
1195Convert Sorted Array to Binary Search Tree LeetCode Solutions113
1196Champagne Tower LeetCode Solution112
1197Maximum Depth Of Binary Tree112
1198Sum of Left Leaves LeetCode Solution112
1199Write a function to get the intersection point of two Linked Lists112
1200Reformat Date LeetCode Solution112
1201Array Queries for multiply replacements and product112
1202Lowest Common Ancestor in Binary Search Tree112
1203Maximum sum bitonic subarray112
1204Filter Restaurants by Vegan-Friendly, Price and Distance Leetcode Solution112
1205Valid Triangle Number112
1206Range Sum Query using Sparse Table111
1207New 21 Game111
1208How to print maximum number of A’s using given four keys111
1209Replace two consecutive equal values with one greater111
1210Maximum sum of pairs with specific difference111
1211Integer Break LeetCode Solution111
1212Concatenation of Array LeetCode Solution110
1213Divide Two Integers Leetcode Solution110
1214Guess The Word110
1215Valid Perfect Square LeetCode Solution110
1216Convert Integer to the Sum of Two No-Zero Integers Leetcode Solution110
1217Range Queries for Longest Correct Bracket Subsequence110
1218Maximum Value at a Given Index in a Bounded Array LeetCode Solution110
1219Symmetric Tree LeetCode Solution Leetcode Solution110
1220Graph and its representation110
1221Design Skiplist LeetCode Solution110
1222Path Crossing Leetcode Solution110
1223Lowest Common Ancestor of a Binary Tree Leetcode Solution109
1224Perfect Squares LeetCode Solution109
1225Print modified array after multiple array range increment operations109
1226Maximum sum of a path in a Right Number Triangle109
1227Arithmetic Slices II – Subsequence LeetCode Solution109
1228Check if each internal node of a BST has exactly one child109
1229The kth Factor of n Leetcode Solution109
1230Check for Identical BSTs without building the trees109
1231BST to a Tree with Sum of all Smaller Keys109
1232Merge Sort109
1233Flatten 2D Vector LeetCode Solution109
1234Check Completeness of a Binary Tree LeetCode Solution109
1235Sliding Window Median Leetcode Solution108
1236Check if all levels of two Binary Tree are anagrams or not108
1237Queries on Probability of Even or Odd Number in given Ranges108
1238Parallel Courses II LeetCode Solution108
1239Count Subsets Having Distinct Even Numbers108
1240Longest Common Prefix Using Word by Word Matching108
1241Minimum Swaps To Make Sequences Increasing LeetCode Solution108
1242Power of Two108
1243Find Minimum in Rotated Sorted Array II LeetCode Solution107
1244Maximize Elements Using Another Array107
1245Maximum Array from Two given Arrays Keeping Order Same107
1246Image Overlap LeetCode Solution107
1247Mean of range in array107
1248Graph Cloning107
1249Missing Number107
1250Largest Plus Sign Leetcode Solution107
1251LRU Cache Leetcode Solution107
1252Count and Toggle Queries on a Binary Array107
1253Contiguous Array107
1254Bold Words in String LeetCode Solution106
1255Print n terms of Newman-Conway Sequence106
1256Check If a String Can Break Another String Leetcode Solution106
1257Find minimum number of merge operations to make an array palindrome106
1258Excel Sheet Column Title LeetCode Solution105
1259Minimum Remove to Make Valid Parentheses LeetCode Solution105
1260Verify Preorder Serialization of a Binary Tree105
1261Find k-th smallest element in BST (Order Statistics in BST)105
1262Maximum Product Subarray104
1263Print Ancestors of a Given Binary Tree Node Without Recursion104
1264Merge k Sorted Lists Leetcode Solution104
1265Next greater element104
1266Palindrome Partitioning103
1267Minimum Time to Collect All Apples in a Tree LeetCode Solution103
1268Smallest Range II Leetcode Solution103
1269Check if two nodes are on the same path in a Tree102
1270Min Cost Climbing Stairs LeetCode Solution102
1271Check in binary array the number represented by a subarray is odd or even101
1272Merge Sorted Array101
1273Orderly Queue LeetCode Solution101
1274Peeking Iterator LeetCode Solution100
1275Koko Eating Bananas LeetCode Solution100
1276Check if X can give change to every person in the Queue99
1277Newman–Shanks–Williams prime99
1278Different Ways to Add Parentheses Leetcode Solution99
1279Number of elements less than or equal to a given number in a given subarray99
1280Largest Submatrix With Rearrangements LeetCode Solution97
1281Find maximum average subarray of k length97
1282Maximum Sum Increasing Subsequence97
1283Range Minimum Query (Square Root Decomposition and Sparse Table)97
1284Queries for Decimal Values of Subarrays of a Binary Array96
1285Longest Substring Without Repeating Characters Leetcode Solution96
1286Number of indexes with equal elements in given range96
1287Maximum product of an increasing subsequence95
1288Array Nesting Leetcode Solution95
1289Minimum Total Space Wasted With K Resizing Operations LeetCode Solution95
1290Binary Tree to Binary Search Tree Conversion using STL set94
1291Check given array of size n can represent BST of n levels or not94
1292Minimum Number of People to Teach LeetCode Solution93
1293Arranging Coins Leetcode Solution93
1294Jump Game IV LeetCode Solution92
1295Find the Winner of the Circular Game LeetCode Solution92
1296Random Pick Index LeetCode Solution92
1297Reach a Number LeetCode Solution92
1298Convert to Base -2 LeetCode Solution92
1299Encoded String With Shortest Length LeetCode Solution92
1300Queries on XOR of greatest odd divisor of the range92
1301Convert a BST to a Binary Tree such that sum of all greater keys is added to every key91
1302Minimum Possible Integer After at Most K Adjacent Swaps On Digits LeetCode Solution90
1303Insert Delete GetRandom O(1) Leetcode Solution90
1304Palindrome Number LeetCode Solution88
1305Number of Subsequences That Satisfy the Given Sum Condition LeetCode solution88
1306Add Two Numbers II Leetcode Solution87
1307Vertical Order Traversal of Binary Tree LeetCode Solution87
1308Design Underground System Leetcode Solution86
1309Continuous Subarray Sum LeetCode Solution85
1310Print Maximum Length Chain of Pairs84
1311Detect Capital Leetcode Solution81
1312Top K Frequent Elements LeetCode Solution79
1313Design A Leaderboard Leetcode Solution79
1314Substring with Concatenation of All Words Leetcode Solution78
1315Minimum Swaps to Group All 1’s Together Leetcode Solution77
1316Minimum Path Sum Leetcode Solution74
1317Decode String Leetcode Solution74
1318Count Sub Islands LeetCode Solution72
1319Odd Even Linked List Leetcode Solution72
1320Binary Tree Inorder Traversal LeetCode Solution72
1321Shifting Letters LeetCode Solution71
1322Shortest Unsorted Continuous Subarray LeetCode Solution71
1323Sum Root to Leaf Numbers LeetCode Solution70
1324Maximum Population Year LeetCode Solution70
1325Best Meeting Point LeetCode Solution70
1326Find the Town Judge LeetCode Solution70
1327Longest Common Subsequence LeetCode Solution68
1328Find the Town Judge LeetCode Solution68
1329Design Add and Search Words Data Structure LeetCode Solution67
1330Rectangle Overlap LeetCode Solution65
1331Maximum Population Year LeetCode Solution65
1332Score of Parenthesis LeetCode Solution65
1333Stone Game IV LeetCode Solution62
1334Insert into a Sorted Circular Linked List LeetCode Solution62
1335Flatten Binary Tree to Linked List LeetCode Solution62
1336Range Sum Query 2D – Immutable LeetCode Solution60
1337Is Graph Bipartite? LeetCode Solution59
1338Valid Triangle Number LeetCode Solution59
1339Reveal Cards In Increasing Order Leetcode Solution54
1340Divide Chocolate LeetCode Solution50
1341Step-By-Step Directions From a Binary Tree Node to Another LeetCode Solution42
1342Range Sum of BST LeetCode Solution42
1343Reverse Integer Leetcode Solution40
1344Sort Colors LeetCode Solution37
1345Find K Closest Elements LeetCode Solution34
1346Excel Sheet Column Number LeetCode Solution33
1347Rotate String LeetCode Solution32
1348Maximum Side Length of a Square with Sum Less than or Equal to Threshold LeetCode Solution31
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