Camelcase Matching Leetcode Solution

Difficulty Level Medium
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Problem Statement:

Camelcase Matching Leetcode Solution says that – Given an array of string “queries” and string “pattern”, return boolean array result where result[i] is true where “queries[i]” matches with “pattern”, false otherwise.

A query word “queries[i]” matches with “pattern” if you can insert some lowercase English letters in “pattern” so that it equals the query. You may insert each character at any position or you may not insert any characters.


Example 1:

queries = ["FooBar","FooBarTest","FootBall","FrameBuffer","ForceFeedBack"], pattern = "FB"


Camelcase Matching Leetcode SolutionPin


Example 2:

queries = ["FooBar","FooBarTest","FootBall","FrameBuffer","ForceFeedBack"], pattern = "FoBa"



For each string in queries, we compare it with the pattern and if both match we push “true” in the result array otherwise we push “false” in the result.

  1. First, we iterate through the given queries, and for each string in the queries, we check if it matches the pattern or not.
  2. For checking, we start with index=0 which represents the character to match in the pattern.
  3. Now loop all characters in the string to be matched with the pattern.
  4. Whenever we encounter a character that is equal to pattern[index], increase index=index+1.
  5. If the character encountered is uppercase and it doesn’t match the pattern[index] returns false.
  6. Return true after all characters in the string are traversed and only if the index value is equal to the length of the Pattern.


C++ code:

class Solution {
    bool isCheck(string query, string pattern){
        int i=0;
        for(auto c:query){
            if(i<pattern.size() && c==pattern[i]) i++;
            else if(c>='A' && c<='Z') return false;
        if(i==pattern.size()) return true;
        return false;
    vector<bool> camelMatch(vector<string>& queries, string pattern) {
        vector<bool> result;
        for(auto i:queries){
            if(isCheck(i, pattern)){
        return result;

Java code:

class Solution {
    public Boolean isCheck(String query, String pattern){
        int i=0;
        for(int c=0;c<query.length();c++){
            if(i<pattern.length() && query.charAt(c)==pattern.charAt(i)) i++;
            else if(query.charAt(c) >= 'A' && query.charAt(c) <= 'Z') return false;
        if(i==pattern.length()) return true;
        return false;
    public List<Boolean> camelMatch(String[] queries, String pattern) {
        List<Boolean> result = new ArrayList<>();
        for(int i=0;i<queries.length;i++){
            if(isCheck(queries[i], pattern)){
        return result;

Complexity Analysis for Camelcase Matching Leetcode Solution:

Time Complexity:

The time complexity will be O(N*M) where N = the length of the “queries” and M= the length of the “pattern”.

Space Complexity:

The space complexity will be O(1) since no extra space is required.

Similar type of question for reference and practice:

String matching in array


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590Distance Between Bus Stops Leetcode Solution173
591Maximum Distance in Array173
592Find the smallest positive integer value that cannot be represented as sum of any subset of a given array173
593Maximum path sum in a triangle173
594Insert Interval Leetcode Solution173
595Maximum Number of Chocolates to be Distributed Equally Among k Students173
5963Sum Closest LeetCode Solution173
597Shortest Path in a Grid with Obstacles Elimination LeetCode Solution173
598Minimum number of distinct elements after removing m items172
599Same Tree LeetCode Solution171
600Minimum insertions to form a palindrome with permutations allowed171
601Permutation in String Leetcode Solution171
602Replace Elements with Greatest Element on Right Side Leetcode Solution171
603Stone Game LeetCode171
604How to check if two given sets are disjoint?171
605Sieve of Eratosthenes171
606Rotate Image LeetCode Solution171
607Sort Characters By Frequency LeetCode Solution171
608Find minimum difference between any two elements171
609Minimum number of subsets with distinct elements171
610Find if an Expression has Duplicate Parenthesis or Not170
611Reverse a stack without using extra space in O(n)170
612Painting Fence Algorithm170
613Bubble sort using two Stacks170
614Frog Jump Leetcode Solution170
615Remove All Occurrences of a Substring LeetCode Solution170
616K Empty Slots LeetCode170
617Word Pattern170
618Sort Array By Parity LeetCode Solution170
619XOR Operation in an Array Leetcode Solution170
620Smallest Good Base170
621Word Wrap Problem170
622Applications of Breadth First Search and Depth First Search170
623Tracking current Maximum Element in a Stack169
624House Robber169
625Printing brackets in Matrix Chain Multiplication Problem169
626Defanging an IP Address Leetcode Solution169
627Distance of nearest cell having 1 in a binary matrix169
628Minimum Depth of Binary Tree Leetcode Solution169
629Best Time to Buy and Sell Stock LeetCode Solution169
630Maximum Consecutive Numbers Present in an Array169
631Non-overlapping sum of two sets169
632Isomorphic Strings169
633Longest Substring with At Most K Distinct Characters LeetCode Solution168
634Wiggle Sort168
635Segregate 0s and 1s in an Array168
636Minimum Cost to Hire K Workers168
637Find Sum of all unique sub-array sum for a given array168
638Longest Increasing Subsequence168
639Find the Duplicate Number LeetCode Solution168
640License Key Formatting Leetcode Solution168
641How to Create Mergable Stack?167
642Count Good Nodes in Binary Tree Leetcode Solution167
643Valid Palindrome II Leetcode Solution167
644Sum of All Odd Length Subarrays Leetcode Solution167
645Find Maximum Level sum in Binary Tree167
646Binary Tree Zigzag Level Order Traversal LeetCode Solution167
647Optimal Account Balancing LeetCode Solution167
648Iterative Method to find Height of Binary Tree167
649Coin Change Problem167
650Maximum difference between first and last indexes of an element in array167
651Moving Average from Data Stream Leetcode Solution167
652Strobogrammatic Number LeetCode Solution166
653GCD Of Two Numbers166
654Kth Missing Positive Number Leetcode Solution166
655Maximum Number of Occurrences of a Substring Leetcode Solution166
656Minimum Number of Steps to Make Two Strings Anagram Leetcode Solutions166
657Queries for counts of array elements with values in given range166
658Employee Free Time LeetCode Solution166
659Check If It Is a Straight Line Leetcode Solution166
660Merge Two Balanced Binary Search Trees166
661Best Time to Buy and Sell Stock with Cooldown Leetcode Solution166
662Find the Distance Value Between Two Arrays Leetcode Solution165
663Number of Provinces Leetcode Solution165
664Reorganize String165
665Path With Maximum Minimum Value LeetCode Solution165
666Valid Palindrome165
667Letter Combinations of a Phone Number165
668Flipping an Image LeetCode Solution165
669Longest Substring with At Least K Repeating Characters LeetCode Solution165
670Convert an array to reduced form165
671Find Largest d in Array such that a + b + c = d165
672Partition Labels LeetCode Solution164
673Find pairs with given sum such that elements of pair are in different rows164
674Maximum Number of Coins You Can Get Leetcode Solution164
675Delete consecutive same words in a sequence164
676Valid Perfect Square Leetcode Solution163
677Edit Distance LeetCode Solution163
678Populating Next Right Pointers in Each Node163
679Recover Binary Search Tree163
680Longest Increasing Path in a Matrix LeetCode Solution163
681K Empty Slots163
682Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest163
683Number of Dice Rolls With Target Sum LeetCode Solution163
684To Lower Case Leetcode Solution163
685Power of Four Leetcode Solution163
686Partition Array Into Three Parts With Equal Sum Leetcode Solution163
687Factorial Trailing Zeroes Leetcode Solution163
688Inorder Successor of a node in Binary Tree163
689Permutation Sequence LeetCode Solution163
690Print the Fibonacci numbers in reverse order163
691Reducing Dishes LeetCode Solution163
692Check If Two String Arrays are Equivalent Leetcode Solution163
693Merge Two Binary Trees LeetCode Solution162
694Construct BST from given Preorder Traversal162
695Lucky Numbers in a Matrix Leetcode Solution162
696Form minimum number from given sequence162
697Sort Array by Increasing Frequency Leetcode Solution162
698Dynamic Programming Basics162
699Increasing Decreasing String Leetcode Solution162
700Check if a queue can be sorted into another queue using a stack162
701Remove Invalid Parentheses Leetcode Solution162
702Maximum Product of Two Elements in an Array Leetcode Solution162
703String to Integer (atoi) LeetCode Solution162
704BFS vs DFS for Binary Tree162
705Convert a Number to Hexadecimal Leetcode Solution161
706Find whether an array is subset of another array161
707Ugly Number Leetcode Solution161
708Unique Paths II Leetcode Solution161
709Subset Sum Leetcode161
710Binary Tree zigzag level order Traversal161
711Reverse Only Letters LeetCode Solution161
712Robot Room Cleaner Leetcode Solution161
713Find the Smallest Divisor given a Threshold Leetcode Solution161
714Reversing a Queue using Recursion161
715Reservoir Sampling161
716Delete Nth node from the end of the given linked list160
717Restore IP Addresses Leetcode Solution160
718Find Leaves of Binary Tree LeetCode Solution160
719Keyboard Row Leetcode Solution160
720Majority Element II Leetcode Solution160
721Binomial Coefficient160
722Check if Two Expressions With Brackets are Same159
723Perform String Shifts Leetcode159
724Decompress Run-Length Encoded List Leetcode Solution159
725Bulb Switcher LeetCode Solution159
726Find the node with minimum value in a Binary Search Tree159
727Find the largest multiple of 3159
728Numbers with prime frequencies greater than or equal to k159
729Add and Search Word – Data structure design LeetCode159
730Finding K closest element158
731Race Car LeetCode Solution158
732Maximum Product of Three Numbers LeetCode Solution158
733Sum of f(a[i], a[j]) over all pairs in an array of n integers158
734Generate all possible sorted arrays from alternate elements of two given sorted arrays158
735Number of Islands II LeetCode Solution158
736Maximum 69 Number Leetcode Solution158
737Find Pair with Greatest Product in Array158
738Minimum Cost For Tickets Leetcode Solution158
739Morris Traversal158
740Hamming Distance Leetcode Solution158
741Sorted Linked List to Balanced BST157
742Merge K Sorted Linked Lists157
743Maximum Depth of N-ary Tree Leetcode Solution157
744Student Attendance Record I Leetcode Solution157
745First Unique Character in a String LeetCode Solution157
746String Compression LeetCode Solution157
747Invert Binary Tree LeetCode Solution157
748Minimum Distance Between BST Nodes Leetcode Solution157
749Tiling Problem157
750Word Pattern LeetCode Solution157
751Rank Transform of an Array Leetcode Solution157
752Find Maximum Depth of Nested Parenthesis in a String157
753Minimum Height Trees157
754Diagonal Traversal of Binary Tree157
755Check If Array Pairs Are Divisible by k LeetCode Solution156
756Find unique character in a string156
757Queue based approach for first non-repeating character in a stream156
758Binary Tree Maximum Path Sum LeetCode Solution156
759Special Array With X Elements Greater Than or Equal X Leetcode Solution156
760Best Meeting Point LeetCode Solution156
761Minimum time required to rot all oranges156
762Kth ancestor of a node in binary tree156
763Find All Duplicates in an Array LeetCode Solution156
764Remove brackets from an algebraic string containing + and – operators156
765Longest Span with same Sum in two Binary arrays156
766Snakes and Ladders LeetCode Solution156
767Find if Path Exists in Graph Leetcode Solution156
768Non-decreasing Array LeetCode Solution156
769Symmetric Tree Leetcode Solution156
770Largest subarray with equal number of 0s and 1s156
771Remove Nth Node From End of List Leetcode Solution156
772Final Prices With a Special Discount in a Shop Leetcode Solution155
773Search a 2D Matrix II Leetcode Solution155
774Evaluate Reverse Polish Notation LeetCode Solution155
775Largest Rectangle in Histogram LeetCode Solution155
776Elements to be added so that all elements of a range are present in array155
777Find Median from Data Stream LeetCode Solution155
778Stack Permutations (Check if an array is stack permutation of other)155
779Maximum Length of a Concatenated String with Unique Characters Leetcode Solution155
780Largest rectangular sub-matrix whose sum is 0155
781Minimize Maximum Pair Sum in Array LeetCode Solution155
782Partition to K Equal Sum Subsets Leetcode Solution155
783Jump Game155
784Count items common to both the lists but with different prices154
785Valid Number154
786Maximum Difference Between Increasing Elements LeetCode Solution154
787Split a String in Balanced Strings Leetcode Solution154
788Transpose Graph154
789Program for Bridge and Torch problem154
790Total Numbers With no Repeated Digits in a Range154
791k-th missing element in increasing sequence which is not present in a given sequence154
792Linked List Cycle154
793N-Queens LeetCode Solution153
794One Edit Distance LeetCode Solution153
795Growable array based stack153
796Nearest Exit from Entrance in Maze LeetCode Solution153
797Check for Palindrome after every character replacement Query153
798Search in a Binary Search Tree Leetcode Solution153
799Get Maximum in Generated Array Leetcode Solution153
800Deletion in a Binary Tree153
801Count quadruples from four sorted arrays whose sum is equal to a given value x153
802Print a Binary Tree in Vertical Order153
803Number of NGEs to the Right153
804Base 7 Leetcode Solution153
805Sort an array according to the order defined by another array153
806Interval Tree153
807Minimum Jumps to Reach Home LeetCode Solution153
808Last Stone Weight II LeetCode Solution153
809Remove Duplicates from Sorted List II152
810Minimum swaps to make sequences increasing152
811Minimum number of jumps to reach end152
812Iterative Preorder Traversal152
813Relative Ranks Leetcode Solution152
814A Space Optimized DP solution for 0-1 Knapsack Problem152
815Subarray Product Less Than K LeetCode Solution152
816Circular Queue152
817Course Schedule II – LeetCode152
818Minimum Time Visiting All Points Leetcode Solution152
819Nested List Weight Sum II LeetCode Solution152
820String comparison containing wildcards152
821Priority Queue using doubly linked list152
822Remove Duplicates from Sorted List LeetCode Solution152
823Crawler Log Folder Leetcode Solution152
824Reorder Data in Log Files LeetCode Solution152
825Maximum Profit in Job Scheduling Leetcode Solution152
826Number Complement Leetcode Solution152
827Merge Sorted Array LeetCode Solution152
828Find all triplets with zero sum151
829Sort Array By Parity II Leetcode Solution151
830Maximum size subarray sum equals k151
831Spiral Matrix II Leetcode Solution151
832Form Minimum Number From Given Sequence151
833Longest Subarray Having Count of 1s One More than Count of 0s151
834Make Two Arrays Equal by Reversing Sub-arrays Leetcode Solution150
835Brick Wall LeetCode Solution150
836Find the subarray with least average150
837Path with maximum average value150
838Minimum Number of Taps to Open to Water a Garden LeetCode Solution150
839Valid Parentheses Leetcode Solution150
840Convert BST to Min Heap150
841Alien Dictionary LeetCode Solution150
842Insert into a Binary Search Tree Leetcode Solution150
843Regular Expression Matching150
844Given an Array of Pairs Find all Symmetric Pairs in it150
845Can Place Flowers LeetCode Solution150
846Sum of nearest smaller and greater number150
847Maximum Nesting Depth of the Parentheses Leetcode Solution150
848Partition List Leetcode Solution149
849Subset with sum divisible by m149
850Check whether a given Binary Tree is Complete or not149
851Count Negative Numbers in a Sorted Matrix LeetCode Solution149
852Clone Graph LeetCode Solution149
853Binary Search Tree Search and Insertion149
854Sort Colors149
855Top K Frequent Words LeetCode Solution149
856Permutation Coefficient149
857Minimum Sum Path in a Triangle149
858Check if a given array can represent Preorder Traversal of Binary Search Tree149
859Find All Possible Recipes from Given Supplies LeetCode Solution149
860Level order Traversal in Spiral Form149
861Count Distinct Elements in Every Window of Size K149
862Friends Pairing Problem149
863Subsequence of Size K With the Largest Even Sum LeetCode Solution149
864Tree Traversal (Preorder, Inorder & Postorder)148
865Find the Only Repetitive Element Between 1 to N-1148
866An Interesting Method to generate Binary Numbers from 1 to n148
867Design a Stack With Increment Operation Leetcode Solution148
868Guess Number Higher or Lower LeetCode Solution148
869Find Maximum Sum Possible Equal Sum of Three Stacks148
870Range LCM Queries148
871Brightest Position on Street LeetCode Solution148
872Missing Element in Sorted Array LeetCode Solution148
873Matrix Chain Multiplication148
874LCS (Longest Common Subsequence) of three strings148
875Check if stack elements are pairwise consecutive148
876Sequences of given length where every element is more than or equal to twice of previous148
877Distinct adjacent elements in an array147
878Design Browser History LeetCode Solution147
879Diagonal Traversal LeetCode Solution147
880Water Bottles Leetcode Solution147
881Best Time to Buy and Sell Stock with Transaction Fee Leetcode Solution147
882Convert Sorted List to Binary Search Tree147
883Identify and Mark Unmatched Parenthesis in an Expression147
884Repeated Substring Pattern LeetCode Solution147
885Balanced Expression with Replacement147
886Sorted Array to Balanced BST147
887K’th Largest Element in BST when modification to BST is not allowed147
888Number of Days Between Two Dates LeetCode Solution147
889Diagonal Traverse LeetCode Solution147
890Union and Intersection of two Linked Lists146
891GCDs of given index ranges in an array146
892Three way partitioning of an array around a given range146
893Guess Number Higher or Lower II146
894Special Positions in a Binary Matrix Leetcode Solution146
895Daily Temperatures Leetcode Solution146
896Minimum sum of multiplications of n numbers146
897Check if an Array is Stack Sortable146
898Shortest Word Distance Leetcode Solution146
899Rearrange an Array Such that arr[i] is equal to i146
900BFS for Disconnected Graph146
901Destination City Leetcode Solution146
902Maximum Score After Splitting a String Leetcode Solution146
903Time Based Key-Value Store LeetCode Solution146
904Insert Delete GetRandom146
905Least Number of Unique Integers after K Removals Leetcode Solution145
906Check if the given array can represent Level Order Traversal of Binary Search Tree145
907Rearrange Array such that arr[i] >= arr[j] if i is even and arr[i] <= arr[j] if i is odd and j < i145
908Range sum queries without updates145
909Queue using Stacks145
910Count ways to reach the nth stair using step 1, 2 or 3145
911Robot Bounded In Circle LeetCode Solution145
912Minimum Swaps to Make Strings Equal Leetcode Solution145
913Find Common Characters Leetcode Solution145
914Spiral Matrix III LeetCode Solution145
915Lemonade Change Leetcode Solution145
916Delete And Earn145
917Find distance between two nodes of a Binary Tree145
918Number of Distinct Islands Leetcode Solution144
919Rearrange Spaces Between Words Leetcode Solution144
920Construct BST from its given Level Order Traversal144
921Vertical sum in a given binary tree144
922Print Fibonacci sequence using 2 variables144
924Palindrome Partitioning Leetcode Solution144
925Merge Two Sorted Lists Leetcode144
926Construct Complete Binary Tree from its Linked List Representation144
927A program to check if a binary tree is BST or not143
928Maximum Frequency Stack Leetcode Solution143
929Check if any two intervals overlap among a given set of intervals143
930Minimum Height Trees LeetCode Solution143
931Alien Dictionary143
932Maximum Subarray Sum Excluding Certain Elements143
933Split Array Into Consecutive Subsequences143
934Construct the Rectangle Leetcode Solution143
935Stone Game II Leetcode143
936Averages of Levels in Binary Tree143
9373 Sum143
938Set Matrix Zeroes Leetcode Solution143
939Difference Array | Range update query in O(1)143
940Queries for GCD of all numbers of an array except elements in a given range142
941Analyze User Website Visit Pattern LeetCode Solution142
942Remove Duplicates from Sorted List II LeetCode Solution142
943Strongly Connected Component142
944Binary Tree Longest Consecutive Sequence LeetCode Solution142
945Count Subarrays with Same Even and Odd Elements142
946Infix to Postfix142
947Trim a Binary Search Tree142
948Create Maximum Number142
949Lexicographical Numbers Leetcode Solution142
950Iterative Postorder Traversal Using Two Stacks142
951Longest Palindromic Subsequence142
952Largest area rectangular sub-matrix with equal number of 1’s and 0’s142
953Binary array after M range toggle operations141
954Sliding Window Maximum141
955All Unique Triplets that Sum up to a Given Value141
956Shuffle 2n integers as without using extra space141
957Unique Paths II141
958Count Submatrices With All Ones LeetCode Solution141
959Collect maximum points in a grid using two traversals141
960Number of Equivalent Domino Pairs Leetcode Solution141
961Find all permuted rows of a given row in a matrix141
962Minesweeper LeetCode Solution140
963Intersection of Two Linked Lists LeetCode Solution140
964Reverse Nodes in K-Group140
965Find postorder traversal of BST from preorder traversal140
966Sign of the Product of an Array LeetCode Solution140
967Three Consecutive Odds Leetcode Solution140
968Can Make Arithmetic Progression From Sequence Leetcode Solution140
969Dividing Array into Pairs With Sum Divisible by K140
970Merging Intervals140
971Height of a generic tree from parent array140
972Maximum Product Subarray140
973Count subarrays where second highest lie before highest140
974Pattern Occurrences using Stack140
975Word Break140
976Symmetric Tree139
977Length of Longest Fibonacci Subsequence139
978Kth Smallest Element in a BST Leetcode Solution139
979Count pair with Given Sum139
980Find the Difference Leetcode Solution139
981Median of Two Sorted Arrays139
982Newman-Conway Sequence139
983Binary Search Tree Delete Operation139
984Count Primes in Ranges139
985Level Order Traversal of Binary Tree139
986Palindrome Partitioning139
987The Painter’s Partition Problem139
988Product of Array Except Self LeetCode Solution139
989Longest Nice Substring LeetCode Solution139
990Maximize Sum of Array after K Negations Leetcode Solution138
991K Closest Points to Origin Leetcode Solution138
992Check If a Word Occurs As a Prefix of Any Word in a Sentence Leetcode Solution138
993Find Maximum of Minimum for Every Window Size in a Given Array138
994Climbing stairs138
995My Calendar I LeetCode Solution138
996Segment Tree138
997Asteroid Collision LeetCode Solution138
998Boundary Traversal of binary tree137
999Find the First Circular Tour that visits all the Petrol Pumps137
1000Valid Boomerang Leetcode Solution137
1001Number of palindromic paths in a matrix137
1002Maximum subsequence sum such that no three are consecutive137
1003Find Duplicate Subtrees137
1004String Matching in an Array Leetcode Solution137
1005Maximum Product of Indexes of Next Greater on Left and Right137
1006Breadth First Search (BFS) for a Graph137
1007Depth First Search (DFS) for a Graph137
1008Merge Sort137
1009Number Of Longest Increasing Subsequence137
1010Maximum Length of Repeated Subarray137
1011Construction of Longest Increasing Subsequence (N log N)137
1012Largest Number Leetcode Solution137
1013Largest divisible pairs subset137
1014Friends Of Appropriate Ages LeetCode Solution137
1015Double the first element and move zero to end137
1016Compute nCr % p137
1017The Maze III LeetCode Solution137
1018Find number of pairs in an array such that their XOR is 0137
1019Shortest Completing Word Leetcode Solution137
1020Make The String Great Leetcode Solution136
1021Morris Inorder Traversal136
1022First missing positive136
1023Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’136
1024Level order traversal using two Queues136
1025Construct Binary Tree from given Parent Array representation136
1026Graph Valid Tree LeetCode Solution136
1027Insertion in a Binary Tree136
1028Minimum Index Sum of Two Lists136
1029Next Greater Element III LeetCode Solution136
1030Kill Process LeetCode Solution136
1031Largest Substring Between Two Equal Characters Leetcode Solution136
1032Serialize and Deserialize Binary Tree136
1033Binary Search Tree136
1034Maximum Number of Ways to Partition an Array LeetCode Solution136
1035Boolean Parenthesization Problem136
1036Maximum weight transformation of a given string136
1037Scramble String LeetCode Solution136
1038Partition Equal Subset Sum136
1039K maximum sums of overlapping contiguous sub-arrays135
1040Decrypt String from Alphabet to Integer Mapping Leetcode Solution135
1041Invalid Transactions LeetCode Solution135
1042Build an Array With Stack Operations Leetcode Solution135
1043Design Hit Counter LeetCode Solution135
1044Count minimum steps to get the given desired array135
1045Longest subsequence such that difference between adjacents is one135
1046Advantages of BST over Hash Table135
1047Path Sum II LeetCode Solution134
1048Custom Sort String Leetcode Solution134
1049Rearrange array such that even positioned are greater than odd134
1050Ugly Numbers134
1051Available Captures for Rook Leetcode Solution134
1052Maximum Sum of 3 Non-Overlapping Subarrays134
1053Balanced Binary Tree134
1054Validate Binary Search Tree134
1055Super Ugly Number133
1056Maximum difference between frequency of two elements such that element having greater frequency is also greater133
1057Count pairs from two sorted arrays whose sum is equal to a given value x133
1058Maximum length subsequence with difference between adjacent elements as either 0 or 1133
1059Iterative Depth First Traversal of Graph133
1060Ugly Number II LeetCode Solution133
1061Implement Trie (Prefix Tree) Leetcode Solution133
1062Add two numbers133
1063Kth Smallest Element in a Sorted Matrix LeetCode Solution133
1064Defanging an IP Address LeetCode Solution133
1065Employee Importance LeetCode Solution133
1066Bitwise AND of Numbers Range LeetCode Solution133
1067Search in Sorted Rotated Array132
1068Find Peak Element132
1069Regular Expression Matching Regular Expression Matching LeetCode Solution132
1070Generate Parentheses Leetcode Solution132
1071Remove Duplicates from Sorted Array II Leetcode Solution132
1072Recover Binary Search Tree Leetcode Solution132
1073Lowest Common Ancestor132
1074Move all negative elements to end in order with extra space allowed132
1075Populating Next Right Pointers in Each Node Leetcode Solution132
1076Root to Leaf path with target sum Leetcode Solutions131
1077Minimum Size Subarray Sum131
1078Determine Whether Matrix Can Be Obtained By Rotation LeetCode Solution131
1079Longest Bitonic Subsequence131
1080Subarrays with K Different Integers Leetcode Solution131
1081Largest BST Subtree LeetCode Solution131
1082Find a Peak Element II LeetCode Solution131
1083Number of Students Doing Homework at a Given Time Leetcode Solution131
1084Binary Tree Right Side View LeetCode Solution131
1085Number of Closed Islands Leetcode Solution130
1086Smallest Common Region Leetcode Solution130
1087Day of the Year Leetcode Solution130
1088Clone a Binary Tree with Random Pointers130
1089Rearrange array such that even index elements are smaller and odd index elements are greater130
1090Maximize Distance to Closest Person LeetCode Solution130
1091Find whether a subarray is in form of a mountain or not130
1092Number of siblings of a given Node in n-ary Tree130
1093Combination Sum IV LeetCode Solution130
1094Kth Smallest Product of Two Sorted Arrays LeetCode Solution130
1095Types of Binary Tree129
1096Palindrome Permutation LeetCode Solution129
1097Minimum Absolute Difference in BST Leetcode Solution129
1098Level of Each node in a Tree from source node129
1099Serialize and Deserialize Binary Tree LeetCode Solution129
1100Increasing Triplet Subsequence LeetCode Solution129
1101Count Largest Group Leetcode Solution129
1102Consecutive Characters LeetCode Solution129
1103Distinct Subsequences129
1104Remove Palindromic Subsequences Leetcode Solution129
1105Find Smallest Range Containing Elements from k Lists129
1106Next Permutation Leetcode Solution129
1107Find the minimum distance between two numbers129
1108Convert BST into a Min-Heap without using array129
1109Binary Tree Data Structure129
1110Find maximum difference between nearest left and right smaller elements129
1111Valid Tic-Tac-Toe State LeetCode Solution128
1112Find Three Element From Different Three Arrays Such That a + b + c = sum128
1113Constant time range add operation on an array128
1114Third Maximum Number Leetcode Solution128
1115Divisible Pairs Counting128
1116Cutting a Rod128
1117Iterative method to find ancestors of a given binary tree128
1118Path Sum128
1119Construct Binary Tree from Preorder and Postorder Traversal LeetCode Solution128
1120Print all triplets in sorted array that form AP128
1121Remove duplicates from sorted array128
1122Prime Palindrome LeetCode Solution127
1123Delete Nodes and Return Forest Leetcode Solution127
1124Products of ranges in an array127
1125Construct K Palindrome Strings LeetCode Solution127
1126Sum of Even Numbers After Queries127
1127Maximum Product Subarray127
1128Reformat The String Leetcode Solution127
1129Print Next Greater Number of Q queries127
1130Longest Subarray of 1’s After Deleting One Element LeetCode Solution127
1131Minimum Score Triangulation of Polygon Leetcode Solution126
1132Cells with Odd Values in a Matrix LeetCode Solution126
1133Write Code to Determine if Two Trees are Identical126
1134Longest Increasing Consecutive Subsequence126
1135Mean of Array After Removing Some Elements Leetcode Solution126
1136Search Insert Position126
1137Print Right View of a Binary Tree126
1138Bottom View of a Binary Tree126
1139Thousand Separator Leetcode Solution126
1140Palindromic Substrings Leetcode Solution125
1141Merge two BSTs with limited extra space125
1142Minimum sum of squares of character counts in a given string after removing k characters125
1143Search an Element in Sorted Rotated Array125
1144Moser-de Bruijn Sequence125
1145Topological Sorting125
1146Maximum Binary Tree124
1147Closest Binary Search Tree Value Leetcode Solution124
1148Red-Black Tree Introduction124
1149Swap Nodes In Pairs124
1150Subset Sum Problem in O(sum) space124
1151Find maximum length Snake sequence124
1152Priority Queue124
1153Find Two Non-overlapping Sub-arrays Each With Target Sum LeetCode Solution124
1154Maximum Product of Splitted Binary Tree LeetCode Solution124
1155Diameter of N-Ary Tree LeetCode Solution123
1156Check Array Formation Through Concatenation Leetcode Solution123
1157Golomb sequence123
1158Bus Routes Leetcode Solution123
1159Print modified array after executing the commands of addition and subtraction123
1160Possible Bipartition LeetCode Solution123
1161Remove Max Number of Edges to Keep Graph Fully Traversable Leetcode Solution122
1162Web Crawler LeetCode Solution122
1163Transform a BST to Greater sum Tree122
1164Queries for Number of Distinct Elements in a Subarray122
1165Binary Tree to Binary Search Tree Conversion122
1166Rotate Array122
1167Search Suggestions System LeetCode Solution122
1168Find Largest Value in Each Tree Row LeetCode Solution122
1169Minimum Sideway Jumps LeetCode Solution122
1170Kth Smallest Number in Multiplication Table Leetcode Solution122
1171Find a sorted subsequence of size 3 in linear time122
1172Maximize sum of consecutive differences in a circular array122
1173Count even length binary sequences with same sum of first and second half bits122
1174Decision Tree121
1175Longest Repeated Subsequence121
1176Find the smallest binary digit multiple of given number121
1177Minimum Cost to Move Chips to The Same Position LeetCode Solution121
1178Matchsticks to Square Leetcode Solution121
1179Graph and its representation121
1180Compare Strings by Frequency of the Smallest Character Leetcode Solution121
1181Decrease Elements To Make Array Zigzag LeetCode Solution120
1182Contiguous Array LeetCode Solution120
1183Factorial Trailing Zeroes LeetCode Solution120
1184First Bad Version120
1185Convert Sorted Array to Binary Search Tree LeetCode Solutions120
1186Swapping Nodes in a Linked List Leetcode Solution120
1187Lowest Common Ancestor in Binary Search Tree120
1188Minimum Moves to Equal Array Elements LeetCode Solution119
1189Maximum sum bitonic subarray119
1190Valid Triangle Number119
1191K’th Largest element in BST using constant extra space119
1192Number of Orders in the Backlog Leetcode Solution119
1193Queue Reconstruction by Height119
1194Reverse a Path in BST using Queue119
1195Sum of Left Leaves LeetCode Solution119
1196Moving Stones Until Consecutive Leetcode Solution118
1197Closest Leaf in a Binary Tree LeetCode Solution118
1198Reformat Date LeetCode Solution118
1199Given a binary tree, how do you remove all the half nodes?118
1200Lowest Common Ancestor of a Binary Tree Leetcode Solution118
1201Maximum number of segments of lengths a, b and c118
1202Range Queries for Longest Correct Bracket Subsequence118
1203Count Pairs Whose Products Exist in Array118
1204How to print maximum number of A’s using given four keys118
1205Maximum sum of pairs with specific difference118
1206Champagne Tower LeetCode Solution117
1207Array Queries for multiply replacements and product117
1208Maximum Depth Of Binary Tree117
1209Kth Smallest Element in a BST117
1210Guess The Word117
1211Concatenation of Array LeetCode Solution116
1212Minimum Swaps To Make Sequences Increasing LeetCode Solution116
1213Filter Restaurants by Vegan-Friendly, Price and Distance Leetcode Solution116
1214Replace two consecutive equal values with one greater116
1215Convert Integer to the Sum of Two No-Zero Integers Leetcode Solution116
1216Path Crossing Leetcode Solution116
1217Range Sum Query using Sparse Table115
1218Flatten 2D Vector LeetCode Solution115
1219Perfect Squares LeetCode Solution115
1220Write a function to get the intersection point of two Linked Lists115
1221Valid Perfect Square LeetCode Solution115
1222Arithmetic Slices II – Subsequence LeetCode Solution115
1223Integer Break LeetCode Solution115
1224The kth Factor of n Leetcode Solution114
1225Power of Two114
1226New 21 Game114
1227Maximum sum of a path in a Right Number Triangle114
1228Sliding Window Median Leetcode Solution114
1229Check Completeness of a Binary Tree LeetCode Solution114
1230Design Skiplist LeetCode Solution114
1231BST to a Tree with Sum of all Smaller Keys114
1232Divide Two Integers Leetcode Solution114
1233Mean of range in array114
1234Check if each internal node of a BST has exactly one child114
1235LRU Cache Leetcode Solution114
1236Longest Common Prefix Using Word by Word Matching113
1237Queries on Probability of Even or Odd Number in given Ranges113
1238Maximum Array from Two given Arrays Keeping Order Same113
1239Largest Plus Sign Leetcode Solution113
1240Print modified array after multiple array range increment operations113
1241Find Minimum in Rotated Sorted Array II LeetCode Solution113
1242Contiguous Array113
1243Bold Words in String LeetCode Solution113
1244Maximize Elements Using Another Array113
1245Check if all levels of two Binary Tree are anagrams or not113
1246Maximum Value at a Given Index in a Bounded Array LeetCode Solution113
1247Check for Identical BSTs without building the trees113
1248Find k-th smallest element in BST (Order Statistics in BST)112
1249Print n terms of Newman-Conway Sequence112
1250Parallel Courses II LeetCode Solution112
1251Print Ancestors of a Given Binary Tree Node Without Recursion112
1252Merge k Sorted Lists Leetcode Solution111
1253Maximum Product Subarray111
1254Find minimum number of merge operations to make an array palindrome111
1255Count Subsets Having Distinct Even Numbers111
1256Graph Cloning111
1257Symmetric Tree LeetCode Solution Leetcode Solution111
1258Missing Number110
1259Smallest Range II Leetcode Solution110
1260Check if two nodes are on the same path in a Tree110
1261Minimum Remove to Make Valid Parentheses LeetCode Solution110
1262Count and Toggle Queries on a Binary Array110
1263Verify Preorder Serialization of a Binary Tree109
1264Next greater element109
1265Number of elements less than or equal to a given number in a given subarray109
1266Check If a String Can Break Another String Leetcode Solution108
1267Minimum Time to Collect All Apples in a Tree LeetCode Solution108
1268Excel Sheet Column Title LeetCode Solution108
1269Image Overlap LeetCode Solution108
1270Orderly Queue LeetCode Solution107
1271Koko Eating Bananas LeetCode Solution107
1272Different Ways to Add Parentheses Leetcode Solution107
1273Min Cost Climbing Stairs LeetCode Solution107
1274Palindrome Partitioning107
1275Check if X can give change to every person in the Queue105
1276Longest Substring Without Repeating Characters Leetcode Solution105
1277Largest Submatrix With Rearrangements LeetCode Solution105
1278Newman–Shanks–Williams prime105
1279Peeking Iterator LeetCode Solution105
1280Check in binary array the number represented by a subarray is odd or even104
1281Merge Sorted Array103
1282Range Minimum Query (Square Root Decomposition and Sparse Table)103
1283Array Nesting Leetcode Solution102
1284Maximum Sum Increasing Subsequence101
1285Arranging Coins Leetcode Solution101
1286Encoded String With Shortest Length LeetCode Solution100
1287Maximum product of an increasing subsequence100
1288Find maximum average subarray of k length100
1289Queries for Decimal Values of Subarrays of a Binary Array99
1290Minimum Total Space Wasted With K Resizing Operations LeetCode Solution99
1291Number of indexes with equal elements in given range99
1292Convert to Base -2 LeetCode Solution98
1293Minimum Number of People to Teach LeetCode Solution98
1294Convert a BST to a Binary Tree such that sum of all greater keys is added to every key97
1295Random Pick Index LeetCode Solution97
1296Reach a Number LeetCode Solution97
1297Vertical Order Traversal of Binary Tree LeetCode Solution96
1298Find the Winner of the Circular Game LeetCode Solution96
1299Binary Tree to Binary Search Tree Conversion using STL set96
1300Check given array of size n can represent BST of n levels or not96
1301Continuous Subarray Sum LeetCode Solution96
1302Add Two Numbers II Leetcode Solution96
1303Number of Subsequences That Satisfy the Given Sum Condition LeetCode solution95
1304Queries on XOR of greatest odd divisor of the range95
1305Jump Game IV LeetCode Solution95
1306Palindrome Number LeetCode Solution95
1307Insert Delete GetRandom O(1) Leetcode Solution94
1308Minimum Possible Integer After at Most K Adjacent Swaps On Digits LeetCode Solution94
1309Design Underground System Leetcode Solution90
1310Print Maximum Length Chain of Pairs89
1311Detect Capital Leetcode Solution87
1312Design A Leaderboard Leetcode Solution86
1313Minimum Swaps to Group All 1’s Together Leetcode Solution83
1314Top K Frequent Elements LeetCode Solution83
1315Substring with Concatenation of All Words Leetcode Solution83
1316Binary Tree Inorder Traversal LeetCode Solution81
1317Count Sub Islands LeetCode Solution80
1318Minimum Path Sum Leetcode Solution80
1319Shifting Letters LeetCode Solution79
1320Longest Common Subsequence LeetCode Solution77
1321Odd Even Linked List Leetcode Solution77
1322Find the Town Judge LeetCode Solution76
1323Best Meeting Point LeetCode Solution76
1324Decode String Leetcode Solution76
1325Maximum Population Year LeetCode Solution75
1326Find the Town Judge LeetCode Solution75
1327Sum Root to Leaf Numbers LeetCode Solution72
1328Shortest Unsorted Continuous Subarray LeetCode Solution72
1329Maximum Population Year LeetCode Solution71
1330Rectangle Overlap LeetCode Solution71
1331Design Add and Search Words Data Structure LeetCode Solution70
1332Stone Game IV LeetCode Solution67
1333Flatten Binary Tree to Linked List LeetCode Solution67
1334Score of Parenthesis LeetCode Solution67
1335Range Sum Query 2D – Immutable LeetCode Solution66
1336Insert into a Sorted Circular Linked List LeetCode Solution66
1337Reveal Cards In Increasing Order Leetcode Solution63
1338Valid Triangle Number LeetCode Solution62
1339Is Graph Bipartite? LeetCode Solution62
1340Divide Chocolate LeetCode Solution55
1341Step-By-Step Directions From a Binary Tree Node to Another LeetCode Solution48
1342Reverse Integer Leetcode Solution46
1343Range Sum of BST LeetCode Solution45
1344Sort Colors LeetCode Solution42
1345Find K Closest Elements LeetCode Solution40
1346Maximum Side Length of a Square with Sum Less than or Equal to Threshold LeetCode Solution38
1347Excel Sheet Column Number LeetCode Solution37
1348Rotate String LeetCode Solution37
1349Maximum Size Subarray Sum Equals k Leetcode Solution20
1350H-Index Leetcode Solution20
1351High Five LeetCode Solution19
1352Monotonic Array Leetcode Solution12
1353Insert Delete GetRandom O(1) – Duplicates allowed LeetCode Solution10
1354Unique Binary Search Trees LeetCode Solution10
1355Valid Triangle Number LeetCode Solution8
1356Peak Index in a Mountain Array LeetCode Solution7
1357Swim in Rising Water LeetCode Solution6
1358Isomorphic Strings LeetCode Solution4
1359Camelcase Matching Leetcode Solution4
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