Pairs of Songs With Total Durations Divisible by 60 LeetCode Solution

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Problem Statement

Pairs of Songs With Total Durations Divisible by 60 LeetCode Solution – Pairs of Songs With Total Durations Divisible by 60 LeetCode Solution says that – You are given a list of songs where the ith song has a duration of time[i] seconds.

Return the number of pairs of songs for which their total duration in seconds is divisible by 60. Formally, we want the number of indices ij such that i < j with (time[i] + time[j]) % 60 == 0.

Example 1:


 time = [30,20,150,100,40]




 Three pairs have a total duration divisible by 60:
(time[0] = 30, time[2] = 150): total duration 180
(time[1] = 20, time[3] = 100): total duration 120
(time[1] = 20, time[4] = 40): total duration 60

Example 2:


 time = [60,60,60]




 All three pairs have a total duration of 120, which is divisible by 60.


  • 1 <= time.length <= 6 * 104
  • 1 <= time[i] <= 500



  • In order to find Pairs of Songs With Total Durations Divisible by 60. We will think of the “count pair with given sum ” question. In this question, it is written that sum of pairs is divisible by 60 so we think like -> x = first number,y = second number.
  • So, If the sum of numbers is divisible by 60 when the remainder of the sum modulo must be equal to 0.
  •                   X%60 + Y%60 = 60.
  • So, First, we will update all the elements by modulo 60 and Will check if the sum of numbers is equal to 60 then we will update our Total and at last we will return Total.[Total is the total pair sum equal to 60].


  • At first, we will update our array for each element modulo by 60. Then we will make one hashmap and total which returns the total pair.
  • Then will find the frequency of each element by using a hashmap.
  • Then again we will run a loop and check for the condition if 60 – element is present in the hashmap within that we will check if 60-element == element(check for element consider more than on time) then update the total by adding count.
  • Else we will check for zero which means a multiple of 60 and find the count of total zeroes and add them into the total.
  • At last, we will return the total.
  • Hence we will count Pairs of Songs With Total Durations Divisible by 60.

Pairs of Songs With Total Durations Divisible by 60 LeetCode SolutionPin


class Solution:
    def numPairsDivisibleBy60(self, time: List[int]) -> int:
        for i in range(len(time)):
            time[i] %= 60
        dic = {}
        for i in time:
            if i in dic:
                dic[i] += 1
                dic[i] = 1
        flag = False        
        count = 0
        for i in range(len(time)):
            if 60-time[i] in dic:
                if 60-time[i] == time[i]:
                    count += dic[60-time[i]]-1
                    count += dic[60-time[i]]
            elif time[i] == 0:
                count += dic[0]-1
        return count // 2
class Solution {
    public int numPairsDivisibleBy60(int[] time) {
        int count = 0;
        if (time == null || time.length == 0) return count;
        Map<Integer, Integer> dic = new HashMap<>();
        for (int i = 0; i < time.length; i++) {          
            int rem = time[i]%60;
            count += dic.getOrDefault((60-rem)%60, 0);
            dic.put(rem, dic.getOrDefault(rem, 0) + 1);
        return count;    

Complexity Analysis for Pairs of Songs With Total Durations Divisible by 60 LeetCode Solution

TIME COMPLEXITY: O(N), As we have traversed through the whole array 2 times.

SPACE COMPLEXITY: O(N). As we have created one hashmap.


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569Island Perimeter Leetcode Solution177
570Largest Perimeter Triangle Leetcode Solution177
571Unique Binary Search Trees177
572Summary Ranges Leetcode Solution177
573Shuffle an Array177
574Convert Sorted Array to Binary Search Tree Leetcode Solution177
575Minimum Knight Moves LeetCode Solution177
576Valid Anagrams177
577Build Array From Permutation Leetcode Solution177
578Check for Balanced Parentheses in an Expression177
57901 Matrix LeetCode Solution176
580Combinations Leetcode Solution176
581Maximum path sum in a triangle176
582Remove Linked List Elements Leetcode Solution176
583LRU Cache LeetCode Solution176
584Maximum sum rectangle in a 2D matrix176
585Count all subsequences having product less than K176
586Trapping Rain Water LeetCode Solution176
587Hamming Distance176
588Count the number of nodes at given level in a tree using BFS175
589Decode Ways175
590Find the smallest positive integer value that cannot be represented as sum of any subset of a given array175
5913Sum Closest LeetCode Solution175
592Rotate List Leetcode Solution175
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
597Bubble sort using two Stacks173
598Maximum Distance in Array173
599Distance Between Bus Stops Leetcode Solution173
600Insert Interval Leetcode Solution173
601Rotate Image LeetCode Solution173
602Same Tree LeetCode Solution173
603Minimum number of distinct elements after removing m items173
604Maximum Number of Chocolates to be Distributed Equally Among k Students173
605Find minimum difference between any two elements173
606Longest Increasing Subsequence172
607Sort Characters By Frequency LeetCode Solution172
608Painting Fence Algorithm172
609How to check if two given sets are disjoint?172
610Find if an Expression has Duplicate Parenthesis or Not172
611XOR Operation in an Array Leetcode Solution172
612Stone Game LeetCode172
613Find Sum of all unique sub-array sum for a given array172
614Sieve of Eratosthenes172
615Applications of Breadth First Search and Depth First Search171
616Word Pattern171
617Frog Jump Leetcode Solution171
618Reverse a stack without using extra space in O(n)171
619License Key Formatting Leetcode Solution171
620Permutation in String Leetcode Solution171
621Replace Elements with Greatest Element on Right Side Leetcode Solution171
622Defanging an IP Address Leetcode Solution171
623K Empty Slots LeetCode170
624House Robber170
625Minimum Cost to Hire K Workers170
626Word Wrap Problem170
627Sort Array By Parity LeetCode Solution170
628Find the Duplicate Number LeetCode Solution170
629Remove All Occurrences of a Substring LeetCode Solution170
630Smallest Good Base170
631Printing brackets in Matrix Chain Multiplication Problem169
632Minimum Depth of Binary Tree Leetcode Solution169
633Non-overlapping sum of two sets169
634Longest Substring with At Least K Repeating Characters LeetCode Solution169
635Distance of nearest cell having 1 in a binary matrix169
636Segregate 0s and 1s in an Array169
637Optimal Account Balancing LeetCode Solution169
638Isomorphic Strings169
639Best Time to Buy and Sell Stock LeetCode Solution169
640Maximum Consecutive Numbers Present in an Array169
641Tracking current Maximum Element in a Stack169
642Employee Free Time LeetCode Solution168
643Moving Average from Data Stream Leetcode Solution168
644Iterative Method to find Height of Binary Tree168
645Binary Tree Zigzag Level Order Traversal LeetCode Solution168
646Valid Palindrome II Leetcode Solution168
647Coin Change Problem168
648Wiggle Sort168
649Kth Missing Positive Number Leetcode Solution168
650Longest Substring with At Most K Distinct Characters LeetCode Solution168
651Merge Two Balanced Binary Search Trees168
652Sum of All Odd Length Subarrays Leetcode Solution167
653Path With Maximum Minimum Value LeetCode Solution167
654Check If It Is a Straight Line Leetcode Solution167
655Reorganize String167
656Count Good Nodes in Binary Tree Leetcode Solution167
657Find Maximum Level sum in Binary Tree167
658Minimum Number of Steps to Make Two Strings Anagram Leetcode Solutions167
659Maximum difference between first and last indexes of an element in array167
660Queries for counts of array elements with values in given range167
661How to Create Mergable Stack?167
662Strobogrammatic Number LeetCode Solution167
663Flipping an Image LeetCode Solution166
664Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest166
665Find the Distance Value Between Two Arrays Leetcode Solution166
666GCD Of Two Numbers166
667Best Time to Buy and Sell Stock with Cooldown Leetcode Solution166
668Maximum Number of Occurrences of a Substring Leetcode Solution166
669Find Largest d in Array such that a + b + c = d166
670Valid Palindrome165
671Print the Fibonacci numbers in reverse order165
672Partition Labels LeetCode Solution165
673Delete consecutive same words in a sequence165
674Letter Combinations of a Phone Number165
675Check if a queue can be sorted into another queue using a stack165
676K Empty Slots165
677Inorder Successor of a node in Binary Tree165
678Convert an array to reduced form165
679Reducing Dishes LeetCode Solution165
680Find pairs with given sum such that elements of pair are in different rows165
681Remove Invalid Parentheses Leetcode Solution165
682Check If Two String Arrays are Equivalent Leetcode Solution164
683Increasing Decreasing String Leetcode Solution164
684BFS vs DFS for Binary Tree164
685Delete Nth node from the end of the given linked list164
686Maximum Number of Coins You Can Get Leetcode Solution164
687To Lower Case Leetcode Solution164
688Number of Dice Rolls With Target Sum LeetCode Solution164
689Factorial Trailing Zeroes Leetcode Solution164
690Lucky Numbers in a Matrix Leetcode Solution163
691Subset Sum Leetcode163
692Power of Four Leetcode Solution163
693Form minimum number from given sequence163
694Valid Perfect Square Leetcode Solution163
695Edit Distance LeetCode Solution163
696Find whether an array is subset of another array163
697Partition Array Into Three Parts With Equal Sum Leetcode Solution163
698Find Leaves of Binary Tree LeetCode Solution163
699Longest Increasing Path in a Matrix LeetCode Solution163
700Find the Smallest Divisor given a Threshold Leetcode Solution163
701Recover Binary Search Tree163
702Permutation Sequence LeetCode Solution163
703Populating Next Right Pointers in Each Node163
704Construct BST from given Preorder Traversal162
705Dynamic Programming Basics162
706Binary Tree zigzag level order Traversal162
707Reversing a Queue using Recursion162
708Merge Two Binary Trees LeetCode Solution162
709Reverse Only Letters LeetCode Solution162
710String to Integer (atoi) LeetCode Solution162
711Unique Paths II Leetcode Solution162
712Ugly Number Leetcode Solution162
713Maximum Product of Two Elements in an Array Leetcode Solution162
714Sort Array by Increasing Frequency Leetcode Solution162
715Robot Room Cleaner Leetcode Solution161
716Keyboard Row Leetcode Solution161
717Find the largest multiple of 3161
718Decompress Run-Length Encoded List Leetcode Solution161
719Binomial Coefficient161
720Convert a Number to Hexadecimal Leetcode Solution161
721Reservoir Sampling161
722Add and Search Word – Data structure design LeetCode161
723Perform String Shifts Leetcode160
724Finding K closest element160
725Find the node with minimum value in a Binary Search Tree160
726Majority Element II Leetcode Solution160
727Restore IP Addresses Leetcode Solution160
728Bulb Switcher LeetCode Solution160
729Rank Transform of an Array Leetcode Solution159
730Hamming Distance Leetcode Solution159
731Check if Two Expressions With Brackets are Same159
732Minimum Cost For Tickets Leetcode Solution159
733Numbers with prime frequencies greater than or equal to k159
734Word Pattern LeetCode Solution159
735Snakes and Ladders LeetCode Solution159
736Find Pair with Greatest Product in Array159
737Sum of f(a[i], a[j]) over all pairs in an array of n integers159
738Find Maximum Depth of Nested Parenthesis in a String159
739Minimum Distance Between BST Nodes Leetcode Solution159
740Race Car LeetCode Solution159
741Minimum Height Trees158
742Tiling Problem158
743Maximum Product of Three Numbers LeetCode Solution158
744Diagonal Traversal of Binary Tree158
745Linked List Cycle158
746Morris Traversal158
747Number of Islands II LeetCode Solution158
748Generate all possible sorted arrays from alternate elements of two given sorted arrays158
749Minimum time required to rot all oranges158
750Invert Binary Tree LeetCode Solution158
751Merge K Sorted Linked Lists158
752Maximum 69 Number Leetcode Solution158
753Binary Tree Maximum Path Sum LeetCode Solution158
754Student Attendance Record I Leetcode Solution158
755Find unique character in a string158
756Longest Span with same Sum in two Binary arrays158
757First Unique Character in a String LeetCode Solution158
758Non-decreasing Array LeetCode Solution158
759Queue based approach for first non-repeating character in a stream158
760Sorted Linked List to Balanced BST157
761Remove brackets from an algebraic string containing + and – operators157
762Find if Path Exists in Graph Leetcode Solution157
763Maximum Depth of N-ary Tree Leetcode Solution157
764Kth ancestor of a node in binary tree157
765Final Prices With a Special Discount in a Shop Leetcode Solution157
766Minimize Maximum Pair Sum in Array LeetCode Solution157
767String Compression LeetCode Solution157
768Remove Nth Node From End of List Leetcode Solution157
769Transpose Graph157
770Stack Permutations (Check if an array is stack permutation of other)157
771Largest subarray with equal number of 0s and 1s157
772Best Meeting Point LeetCode Solution157
773Symmetric Tree Leetcode Solution156
774Special Array With X Elements Greater Than or Equal X Leetcode Solution156
775Jump Game156
776Check If Array Pairs Are Divisible by k LeetCode Solution156
777Largest Rectangle in Histogram LeetCode Solution156
778Elements to be added so that all elements of a range are present in array156
779Find All Duplicates in an Array LeetCode Solution156
780Partition to K Equal Sum Subsets Leetcode Solution156
781Total Numbers With no Repeated Digits in a Range156
782Maximum Length of a Concatenated String with Unique Characters Leetcode Solution156
783Evaluate Reverse Polish Notation LeetCode Solution155
784Search a 2D Matrix II Leetcode Solution155
785k-th missing element in increasing sequence which is not present in a given sequence155
786Program for Bridge and Torch problem155
787Split a String in Balanced Strings Leetcode Solution155
788Count items common to both the lists but with different prices155
789Largest rectangular sub-matrix whose sum is 0155
790Maximum Difference Between Increasing Elements LeetCode Solution155
791Find Median from Data Stream LeetCode Solution155
792Deletion in a Binary Tree154
793Sort an array according to the order defined by another array154
794Longest Subarray Having Count of 1s One More than Count of 0s154
795N-Queens LeetCode Solution154
796Print a Binary Tree in Vertical Order154
797Interval Tree154
798Circular Queue154
799Growable array based stack154
800Minimum Jumps to Reach Home LeetCode Solution154
801Valid Number154
802Base 7 Leetcode Solution154
803Number of NGEs to the Right154
804Course Schedule II – LeetCode154
805Check for Palindrome after every character replacement Query154
806Search in a Binary Search Tree Leetcode Solution154
807Minimum Time Visiting All Points Leetcode Solution153
808Minimum number of jumps to reach end153
809Sort Array By Parity II Leetcode Solution153
810Nested List Weight Sum II LeetCode Solution153
811Merge Sorted Array LeetCode Solution153
812Last Stone Weight II LeetCode Solution153
813Reorder Data in Log Files LeetCode Solution153
814Remove Duplicates from Sorted List II153
815Spiral Matrix II Leetcode Solution153
816Nearest Exit from Entrance in Maze LeetCode Solution153
817Get Maximum in Generated Array Leetcode Solution153
818One Edit Distance LeetCode Solution153
819Count quadruples from four sorted arrays whose sum is equal to a given value x153
820Number Complement Leetcode Solution153
821String comparison containing wildcards153
822Minimum swaps to make sequences increasing153
823Crawler Log Folder Leetcode Solution152
824Find all triplets with zero sum152
825Maximum Profit in Job Scheduling Leetcode Solution152
826Subarray Product Less Than K LeetCode Solution152
827Regular Expression Matching152
828Find Maximum Sum Possible Equal Sum of Three Stacks152
829Relative Ranks Leetcode Solution152
830Remove Duplicates from Sorted List LeetCode Solution152
831Maximum size subarray sum equals k152
832Iterative Preorder Traversal152
833Priority Queue using doubly linked list152
834A Space Optimized DP solution for 0-1 Knapsack Problem152
835Convert BST to Min Heap152
836LCS (Longest Common Subsequence) of three strings151
837Insert into a Binary Search Tree Leetcode Solution151
838Form Minimum Number From Given Sequence151
839Sort Colors150
840Check if a given array can represent Preorder Traversal of Binary Search Tree150
841Given an Array of Pairs Find all Symmetric Pairs in it150
842Friends Pairing Problem150
843Level order Traversal in Spiral Form150
844Binary Search Tree Search and Insertion150
845Subset with sum divisible by m150
846Maximum Nesting Depth of the Parentheses Leetcode Solution150
847Top K Frequent Words LeetCode Solution150
848Path with maximum average value150
849Find the subarray with least average150
850Tree Traversal (Preorder, Inorder & Postorder)150
851Brick Wall LeetCode Solution150
852Design a Stack With Increment Operation Leetcode Solution150
853Sum of nearest smaller and greater number150
854Can Place Flowers LeetCode Solution150
855Make Two Arrays Equal by Reversing Sub-arrays Leetcode Solution150
856Partition List Leetcode Solution150
857Minimum Swaps to Make Strings Equal Leetcode Solution150
858Minimum Number of Taps to Open to Water a Garden LeetCode Solution150
859Alien Dictionary LeetCode Solution150
860Valid Parentheses Leetcode Solution150
861Sequences of given length where every element is more than or equal to twice of previous150
862Guess Number Higher or Lower LeetCode Solution149
863Find All Possible Recipes from Given Supplies LeetCode Solution149
864Identify and Mark Unmatched Parenthesis in an Expression149
865Matrix Chain Multiplication149
866Count Distinct Elements in Every Window of Size K149
867Brightest Position on Street LeetCode Solution149
868Subsequence of Size K With the Largest Even Sum LeetCode Solution149
869Missing Element in Sorted Array LeetCode Solution149
870Balanced Expression with Replacement149
871Minimum Sum Path in a Triangle149
872Permutation Coefficient149
873Clone Graph LeetCode Solution149
874Count Negative Numbers in a Sorted Matrix LeetCode Solution149
875Sorted Array to Balanced BST149
876Number of Days Between Two Dates LeetCode Solution149
877Find the Only Repetitive Element Between 1 to N-1149
878Check whether a given Binary Tree is Complete or not149
879Range LCM Queries149
880Diagonal Traverse LeetCode Solution148
881Best Time to Buy and Sell Stock with Transaction Fee Leetcode Solution148
882Check if stack elements are pairwise consecutive148
883Time Based Key-Value Store LeetCode Solution148
884Count ways to reach the nth stair using step 1, 2 or 3148
885GCDs of given index ranges in an array148
886Find Common Characters Leetcode Solution148
887An Interesting Method to generate Binary Numbers from 1 to n148
888Union and Intersection of two Linked Lists148
889Destination City Leetcode Solution148
890Range sum queries without updates148
891Repeated Substring Pattern LeetCode Solution148
892Three way partitioning of an array around a given range147
893Design Browser History LeetCode Solution147
894BFS for Disconnected Graph147
895Diagonal Traversal LeetCode Solution147
896Distinct adjacent elements in an array147
897Shortest Word Distance Leetcode Solution147
898Check if an Array is Stack Sortable147
899Find distance between two nodes of a Binary Tree147
900Spiral Matrix III LeetCode Solution147
901Rearrange an Array Such that arr[i] is equal to i147
902K’th Largest Element in BST when modification to BST is not allowed147
903Averages of Levels in Binary Tree147
904Water Bottles Leetcode Solution147
905Rearrange Array such that arr[i] >= arr[j] if i is even and arr[i] <= arr[j] if i is odd and j < i147
906Delete And Earn147
907Convert Sorted List to Binary Search Tree147
908Lemonade Change Leetcode Solution147
909Guess Number Higher or Lower II147
910Insert Delete GetRandom147
911Daily Temperatures Leetcode Solution146
912Construct Complete Binary Tree from its Linked List Representation146
913Set Matrix Zeroes Leetcode Solution146
914Vertical sum in a given binary tree146
915Minimum sum of multiplications of n numbers146
916Rearrange Spaces Between Words Leetcode Solution146
917Special Positions in a Binary Matrix Leetcode Solution146
918Maximum Score After Splitting a String Leetcode Solution146
919Robot Bounded In Circle LeetCode Solution146
920Queue using Stacks146
921Least Number of Unique Integers after K Removals Leetcode Solution146
922Number of Distinct Islands Leetcode Solution145
923Find all permuted rows of a given row in a matrix145
924Check if the given array can represent Level Order Traversal of Binary Search Tree145
925Alien Dictionary145
926Iterative Postorder Traversal Using Two Stacks145
927Dividing Array into Pairs With Sum Divisible by K145
928Construct the Rectangle Leetcode Solution145
929Print Fibonacci sequence using 2 variables144
9303 Sum144
931Largest area rectangular sub-matrix with equal number of 1’s and 0’s144
932Palindrome Partitioning Leetcode Solution144
933Lexicographical Numbers Leetcode Solution144
935A program to check if a binary tree is BST or not144
936Split Array Into Consecutive Subsequences144
937Count Subarrays with Same Even and Odd Elements144
938Merge Two Sorted Lists Leetcode144
939Construct BST from its given Level Order Traversal144
940Maximum Subarray Sum Excluding Certain Elements144
941Binary Tree Longest Consecutive Sequence LeetCode Solution144
942Strongly Connected Component143
943Difference Array | Range update query in O(1)143
944Check if any two intervals overlap among a given set of intervals143
945Queries for GCD of all numbers of an array except elements in a given range143
946Minimum Height Trees LeetCode Solution143
947Stone Game II Leetcode143
948Median of Two Sorted Arrays143
949Longest Palindromic Subsequence143
950Remove Duplicates from Sorted List II LeetCode Solution143
951Number of Equivalent Domino Pairs Leetcode Solution143
952Maximum Frequency Stack Leetcode Solution143
953Sliding Window Maximum143
954Three Consecutive Odds Leetcode Solution143
955Create Maximum Number143
956Collect maximum points in a grid using two traversals142
957Trim a Binary Search Tree142
958My Calendar I LeetCode Solution142
959Analyze User Website Visit Pattern LeetCode Solution142
960Infix to Postfix142
961Can Make Arithmetic Progression From Sequence Leetcode Solution142
962All Unique Triplets that Sum up to a Given Value142
963Maximize Sum of Array after K Negations Leetcode Solution142
964Merging Intervals141
965Count Primes in Ranges141
966Shuffle 2n integers as without using extra space141
967Binary array after M range toggle operations141
968Maximum Product Subarray141
969Find the Difference Leetcode Solution141
970Count Submatrices With All Ones LeetCode Solution141
971Find postorder traversal of BST from preorder traversal141
972Kth Smallest Element in a BST Leetcode Solution141
973Intersection of Two Linked Lists LeetCode Solution141
974Unique Paths II141
975Minesweeper LeetCode Solution141
976Reverse Nodes in K-Group140
977Word Break140
978Length of Longest Fibonacci Subsequence140
979K Closest Points to Origin Leetcode Solution140
980Longest Nice Substring LeetCode Solution140
981Symmetric Tree140
982Count subarrays where second highest lie before highest140
983Pattern Occurrences using Stack140
984Find Maximum of Minimum for Every Window Size in a Given Array140
985Boundary Traversal of binary tree140
986Climbing stairs140
987Height of a generic tree from parent array140
988Sign of the Product of an Array LeetCode Solution140
989The Painter’s Partition Problem140
990Count pair with Given Sum140
991Maximum length subsequence with difference between adjacent elements as either 0 or 1139
992Check If a Word Occurs As a Prefix of Any Word in a Sentence Leetcode Solution139
993Largest Substring Between Two Equal Characters Leetcode Solution139
994Valid Boomerang Leetcode Solution139
995Largest divisible pairs subset139
996Product of Array Except Self LeetCode Solution139
997Asteroid Collision LeetCode Solution139
998Palindrome Partitioning139
999Binary Search Tree Delete Operation139
1000Friends Of Appropriate Ages LeetCode Solution139
1001Level Order Traversal of Binary Tree139
1002Newman-Conway Sequence139
1003Largest Number Leetcode Solution139
1004Boolean Parenthesization Problem138
1005Maximum Length of Repeated Subarray138
1006Find number of pairs in an array such that their XOR is 0138
1007Find Duplicate Subtrees138
1008Double the first element and move zero to end138
1009Number Of Longest Increasing Subsequence138
1010Breadth First Search (BFS) for a Graph138
1011Merge Sort138
1012Maximum subsequence sum such that no three are consecutive138
1013Shortest Completing Word Leetcode Solution138
1014Insertion in a Binary Tree138
1015Minimum Index Sum of Two Lists138
1016Maximum Number of Ways to Partition an Array LeetCode Solution138
1017Construction of Longest Increasing Subsequence (N log N)138
1018Scramble String LeetCode Solution138
1019Graph Valid Tree LeetCode Solution138
1020Segment Tree138
1021The Maze III LeetCode Solution138
1022Maximum Sum of 3 Non-Overlapping Subarrays137
1023Rearrange array such that even positioned are greater than odd137
1024Depth First Search (DFS) for a Graph137
1025Longest subsequence such that difference between adjacents is one137
1026Kill Process LeetCode Solution137
1027Number of palindromic paths in a matrix137
1028Binary Search Tree137
1029Maximum Product of Indexes of Next Greater on Left and Right137
1030Ugly Numbers137
1031Find the First Circular Tour that visits all the Petrol Pumps137
1032Compute nCr % p137
1033Construct Binary Tree from given Parent Array representation137
1034String Matching in an Array Leetcode Solution137
1035Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’137
1036Decrypt String from Alphabet to Integer Mapping Leetcode Solution137
1037Partition Equal Subset Sum137
1038First missing positive136
1039Level order traversal using two Queues136
1040K maximum sums of overlapping contiguous sub-arrays136
1041Make The String Great Leetcode Solution136
1042Available Captures for Rook Leetcode Solution136
1043Serialize and Deserialize Binary Tree136
1044Design Hit Counter LeetCode Solution136
1045Maximum weight transformation of a given string136
1046Iterative Depth First Traversal of Graph136
1047Morris Inorder Traversal136
1048Count minimum steps to get the given desired array136
1049Next Greater Element III LeetCode Solution136
1050Build an Array With Stack Operations Leetcode Solution136
1051Custom Sort String Leetcode Solution135
1052Invalid Transactions LeetCode Solution135
1053Kth Smallest Element in a Sorted Matrix LeetCode Solution135
1054Bitwise AND of Numbers Range LeetCode Solution135
1055Maximum difference between frequency of two elements such that element having greater frequency is also greater135
1056Balanced Binary Tree135
1057Add two numbers135
1058Advantages of BST over Hash Table135
1059Count pairs from two sorted arrays whose sum is equal to a given value x134
1060Validate Binary Search Tree134
1061Path Sum II LeetCode Solution134
1062Employee Importance LeetCode Solution134
1063Rearrange array such that even index elements are smaller and odd index elements are greater133
1064Move all negative elements to end in order with extra space allowed133
1065Ugly Number II LeetCode Solution133
1066Super Ugly Number133
1067Minimum Size Subarray Sum133
1068Determine Whether Matrix Can Be Obtained By Rotation LeetCode Solution133
1069Lowest Common Ancestor133
1070Generate Parentheses Leetcode Solution133
1071Implement Trie (Prefix Tree) Leetcode Solution133
1072Defanging an IP Address LeetCode Solution133
1073Find a Peak Element II LeetCode Solution133
1074Recover Binary Search Tree Leetcode Solution133
1075Root to Leaf path with target sum Leetcode Solutions132
1076Find Peak Element132
1077Binary Tree Right Side View LeetCode Solution132
1078Remove Duplicates from Sorted Array II Leetcode Solution132
1079Subarrays with K Different Integers Leetcode Solution132
1080Search in Sorted Rotated Array132
1081Number of Closed Islands Leetcode Solution132
1082Populating Next Right Pointers in Each Node Leetcode Solution132
1083Regular Expression Matching Regular Expression Matching LeetCode Solution132
1084Find whether a subarray is in form of a mountain or not132
1085Largest BST Subtree LeetCode Solution132
1086Count Largest Group Leetcode Solution131
1087Longest Bitonic Subsequence131
1088Number of Students Doing Homework at a Given Time Leetcode Solution131
1089Combination Sum IV LeetCode Solution131
1090Remove Palindromic Subsequences Leetcode Solution131
1091Day of the Year Leetcode Solution131
1092Smallest Common Region Leetcode Solution131
1093Find Smallest Range Containing Elements from k Lists131
1094Types of Binary Tree131
1095Kth Smallest Product of Two Sorted Arrays LeetCode Solution130
1096Clone a Binary Tree with Random Pointers130
1097Number of siblings of a given Node in n-ary Tree130
1098Consecutive Characters LeetCode Solution130
1099Serialize and Deserialize Binary Tree LeetCode Solution130
1100Minimum Absolute Difference in BST Leetcode Solution130
1101Binary Tree Data Structure130
1102Print all triplets in sorted array that form AP130
1103Maximize Distance to Closest Person LeetCode Solution130
1104Construct K Palindrome Strings LeetCode Solution129
1105Path Sum129
1106Palindrome Permutation LeetCode Solution129
1107Remove duplicates from sorted array129
1108Convert BST into a Min-Heap without using array129
1109Increasing Triplet Subsequence LeetCode Solution129
1110Print Next Greater Number of Q queries129
1111Sum of Even Numbers After Queries129
1112Find maximum difference between nearest left and right smaller elements129
1113Next Permutation Leetcode Solution129
1114Distinct Subsequences129
1115Level of Each node in a Tree from source node129
1116Cutting a Rod129
1117Find the minimum distance between two numbers129
1118Longest Increasing Consecutive Subsequence128
1119Reformat The String Leetcode Solution128
1120Minimum sum of squares of character counts in a given string after removing k characters128
1121Mean of Array After Removing Some Elements Leetcode Solution128
1122Bottom View of a Binary Tree128
1123Iterative method to find ancestors of a given binary tree128
1124Valid Tic-Tac-Toe State LeetCode Solution128
1125Constant time range add operation on an array128
1126Construct Binary Tree from Preorder and Postorder Traversal LeetCode Solution128
1127Third Maximum Number Leetcode Solution128
1128Maximum Product Subarray128
1129Divisible Pairs Counting128
1130Find Three Element From Different Three Arrays Such That a + b + c = sum128
1131Delete Nodes and Return Forest Leetcode Solution127
1132Maximum Product of Splitted Binary Tree LeetCode Solution127
1133Minimum Score Triangulation of Polygon Leetcode Solution127
1134Thousand Separator Leetcode Solution127
1135Products of ranges in an array127
1136Longest Subarray of 1’s After Deleting One Element LeetCode Solution127
1137Print Right View of a Binary Tree127
1138Prime Palindrome LeetCode Solution127
1139Write Code to Determine if Two Trees are Identical127
1140Palindromic Substrings Leetcode Solution126
1141Queries for Number of Distinct Elements in a Subarray126
1142Search Insert Position126
1143Find maximum length Snake sequence126
1144Moser-de Bruijn Sequence126
1145Search an Element in Sorted Rotated Array126
1146Swap Nodes In Pairs126
1147Cells with Odd Values in a Matrix LeetCode Solution126
1148Maximum Binary Tree125
1149Topological Sorting125
1150Subset Sum Problem in O(sum) space125
1151Red-Black Tree Introduction125
1152Merge two BSTs with limited extra space125
1153Bus Routes Leetcode Solution124
1154Closest Binary Search Tree Value Leetcode Solution124
1155Find Two Non-overlapping Sub-arrays Each With Target Sum LeetCode Solution124
1156Diameter of N-Ary Tree LeetCode Solution124
1157Maximize sum of consecutive differences in a circular array124
1158Print modified array after executing the commands of addition and subtraction124
1159Check Array Formation Through Concatenation Leetcode Solution124
1160Transform a BST to Greater sum Tree124
1161Priority Queue124
1162Kth Smallest Number in Multiplication Table Leetcode Solution124
1163Find Largest Value in Each Tree Row LeetCode Solution123
1164Search Suggestions System LeetCode Solution123
1165Decision Tree123
1166Remove Max Number of Edges to Keep Graph Fully Traversable Leetcode Solution123
1167Golomb sequence123
1168Web Crawler LeetCode Solution123
1169Possible Bipartition LeetCode Solution123
1170Minimum Sideway Jumps LeetCode Solution123
1171Rotate Array122
1172Compare Strings by Frequency of the Smallest Character Leetcode Solution122
1173Find the smallest binary digit multiple of given number122
1174Count even length binary sequences with same sum of first and second half bits122
1175Find a sorted subsequence of size 3 in linear time122
1176Binary Tree to Binary Search Tree Conversion122
1177K’th Largest element in BST using constant extra space122
1178Minimum Moves to Equal Array Elements LeetCode Solution122
1179Longest Repeated Subsequence122
1180Minimum Cost to Move Chips to The Same Position LeetCode Solution122
1181Swapping Nodes in a Linked List Leetcode Solution121
1182Factorial Trailing Zeroes LeetCode Solution121
1183Decrease Elements To Make Array Zigzag LeetCode Solution121
1184Matchsticks to Square Leetcode Solution121
1185Graph and its representation121
1186First Bad Version121
1187Given a binary tree, how do you remove all the half nodes?121
1188Reverse a Path in BST using Queue121
1189Number of Orders in the Backlog Leetcode Solution120
1190Reformat Date LeetCode Solution120
1191Convert Sorted Array to Binary Search Tree LeetCode Solutions120
1192Count Pairs Whose Products Exist in Array120
1193Contiguous Array LeetCode Solution120
1194Filter Restaurants by Vegan-Friendly, Price and Distance Leetcode Solution120
1195Lowest Common Ancestor in Binary Search Tree120
1196Maximum number of segments of lengths a, b and c120
1197Queue Reconstruction by Height120
1198Maximum sum of pairs with specific difference120
1199Sum of Left Leaves LeetCode Solution119
1200Maximum Depth Of Binary Tree119
1201Valid Triangle Number119
1202How to print maximum number of A’s using given four keys119
1203Maximum sum bitonic subarray119
1204Concatenation of Array LeetCode Solution119
1205Range Queries for Longest Correct Bracket Subsequence119
1206Path Crossing Leetcode Solution119
1207Closest Leaf in a Binary Tree LeetCode Solution119
1208Moving Stones Until Consecutive Leetcode Solution118
1209BST to a Tree with Sum of all Smaller Keys118
1210Minimum Swaps To Make Sequences Increasing LeetCode Solution118
1211Lowest Common Ancestor of a Binary Tree Leetcode Solution118
1212Champagne Tower LeetCode Solution118
1213Write a function to get the intersection point of two Linked Lists117
1214Kth Smallest Element in a BST117
1215LRU Cache Leetcode Solution117
1216Perfect Squares LeetCode Solution117
1217Divide Two Integers Leetcode Solution117
1218Guess The Word117
1219Array Queries for multiply replacements and product117
1220Integer Break LeetCode Solution117
1221Sliding Window Median Leetcode Solution116
1222Valid Perfect Square LeetCode Solution116
1223Maximize Elements Using Another Array116
1224Replace two consecutive equal values with one greater116
1225Convert Integer to the Sum of Two No-Zero Integers Leetcode Solution116
1226Flatten 2D Vector LeetCode Solution116
1227Mean of range in array116
1228Maximum sum of a path in a Right Number Triangle116
1229Maximum Value at a Given Index in a Bounded Array LeetCode Solution116
1230Queries on Probability of Even or Odd Number in given Ranges116
1231Check if all levels of two Binary Tree are anagrams or not116
1232New 21 Game115
1233Design Skiplist LeetCode Solution115
1234Maximum Array from Two given Arrays Keeping Order Same115
1235Arithmetic Slices II – Subsequence LeetCode Solution115
1236Power of Two115
1237Range Sum Query using Sparse Table115
1238The kth Factor of n Leetcode Solution115
1239Find Minimum in Rotated Sorted Array II LeetCode Solution114
1240Graph Cloning114
1241Longest Common Prefix Using Word by Word Matching114
1242Check for Identical BSTs without building the trees114
1243Check if each internal node of a BST has exactly one child114
1244Check Completeness of a Binary Tree LeetCode Solution114
1245Bold Words in String LeetCode Solution114
1246Find k-th smallest element in BST (Order Statistics in BST)113
1247Print modified array after multiple array range increment operations113
1248Count Subsets Having Distinct Even Numbers113
1249Contiguous Array113
1250Parallel Courses II LeetCode Solution113
1251Maximum Product Subarray113
1252Largest Plus Sign Leetcode Solution113
1253Print n terms of Newman-Conway Sequence112
1254Symmetric Tree LeetCode Solution Leetcode Solution112
1255Find minimum number of merge operations to make an array palindrome112
1256Print Ancestors of a Given Binary Tree Node Without Recursion112
1257Image Overlap LeetCode Solution111
1258Missing Number111
1259Check if two nodes are on the same path in a Tree111
1260Minimum Remove to Make Valid Parentheses LeetCode Solution111
1261Merge k Sorted Lists Leetcode Solution111
1262Verify Preorder Serialization of a Binary Tree110
1263Excel Sheet Column Title LeetCode Solution110
1264Smallest Range II Leetcode Solution110
1265Number of elements less than or equal to a given number in a given subarray110
1266Count and Toggle Queries on a Binary Array110
1267Next greater element109
1268Check If a String Can Break Another String Leetcode Solution108
1269Orderly Queue LeetCode Solution108
1270Minimum Time to Collect All Apples in a Tree LeetCode Solution108
1271Palindrome Partitioning108
1272Different Ways to Add Parentheses Leetcode Solution107
1273Min Cost Climbing Stairs LeetCode Solution107
1274Koko Eating Bananas LeetCode Solution107
1275Longest Substring Without Repeating Characters Leetcode Solution106
1276Check in binary array the number represented by a subarray is odd or even106
1277Peeking Iterator LeetCode Solution106
1278Largest Submatrix With Rearrangements LeetCode Solution106
1279Check if X can give change to every person in the Queue105
1280Newman–Shanks–Williams prime105
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
1286Maximum Sum Increasing Subsequence101
1287Find maximum average subarray of k length101
1288Arranging Coins Leetcode Solution101
1289Check given array of size n can represent BST of n levels or not100
1290Number of indexes with equal elements in given range100
1291Convert a BST to a Binary Tree such that sum of all greater keys is added to every key100
1292Maximum product of an increasing subsequence100
1293Minimum Total Space Wasted With K Resizing Operations LeetCode Solution99
1294Convert to Base -2 LeetCode Solution99
1295Find the Winner of the Circular Game LeetCode Solution98
1296Continuous Subarray Sum LeetCode Solution98
1297Random Pick Index LeetCode Solution98
1298Minimum Number of People to Teach LeetCode Solution98
1299Reach a Number LeetCode Solution97
1300Jump Game IV LeetCode Solution97
1301Add Two Numbers II Leetcode Solution97
1302Binary Tree to Binary Search Tree Conversion using STL set97
1303Number of Subsequences That Satisfy the Given Sum Condition LeetCode solution96
1304Vertical Order Traversal of Binary Tree LeetCode Solution96
1305Queries on XOR of greatest odd divisor of the range96
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
1311Shifting Letters LeetCode Solution88
1312Detect Capital Leetcode Solution88
1313Design A Leaderboard Leetcode Solution87
1314Substring with Concatenation of All Words Leetcode Solution84
1315Minimum Swaps to Group All 1’s Together Leetcode Solution83
1316Count Sub Islands LeetCode Solution83
1317Top K Frequent Elements LeetCode Solution83
1318Minimum Path Sum Leetcode Solution81
1319Binary Tree Inorder Traversal LeetCode Solution81
1320Longest Common Subsequence LeetCode Solution78
1321Maximum Population Year LeetCode Solution77
1322Find the Town Judge LeetCode Solution77
1323Odd Even Linked List Leetcode Solution77
1324Decode String 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
1329Design Add and Search Words Data Structure LeetCode Solution71
1330Rectangle Overlap LeetCode Solution71
1331Maximum Population Year 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 Solution18
1353Monotonic Array Leetcode Solution16
1354Group Shifted Strings Leetcode Solution13
1355Insert Delete GetRandom O(1) – Duplicates allowed LeetCode Solution12
1356Peak Index in a Mountain Array LeetCode Solution11
1357Unique Binary Search Trees LeetCode Solution11
1358Valid Triangle Number LeetCode Solution10
1359Next Greater Element I Leetcode Solution9
1360Next Permutation LeetCode Solution9
1361Isomorphic Strings LeetCode Solution9
1362Flatten Binary Tree to Linked List LeetCode Solution8
1363Minimum Number of Arrows to Burst Balloons LeetCode Solution8
1364Closest Binary Search Tree Value II LeetCode Solution8
1365Swim in Rising Water LeetCode Solution7
1366Sentence Screen Fitting LeetCode Solution7
1367Valid Anagram Leetcode Solution5
1368Paint House LeetCode Solution5
1369Pairs of Songs With Total Durations Divisible by 60 LeetCode Solution
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