Shifting Letters LeetCode Solution

Difficulty Level Medium
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Array StringViews 82

Problem Statement

Shifting Letters says that we have given a string s and an array shifts.

Now for each shifts[i] = x, we want to shift the first i + 1 letters of sx times. We have to return the final string after all shifts are applied.

Example 1:


 s = "abc", shifts = [3,5,9]




  • We start with “abc”.
  • After Shifting the first 1 letter of s by 3, we have “dbc”.
  • After shifting the first 2 letters of s by 5, we have “igc”.
  • After shifting the first 3 letters of s by 9, we have “rpl”.
  • Hence “rpl” is our final answer.

Example 2:


 s = "aaa", shifts = [1,2,3]




  • 1 <= s.length <= 105
  • s consists of lowercase English letters.
  • shifts.length == s.length
  • 0 <= shifts[i] <= 109



  1. We have to calculate how many times i-th character is shifted.
  2. So just calculate the number of shifts on each position, by shifts[i] += shift[i+1].
  3. We will do the task in reverse order.
  4. We have to maintain a  reverse prefix sum of the shift array and this will be equal to the number of shifts for each character.
  5. One thing we should focus if we found that our character ASCII score exceeds the value of the ASCII score of ‘z’ we should start counting from ‘a.


Shifting Letters LeetCode C++ Solution

class Solution {
    #define ll int
    string shiftingLetters(string s, vector<int>& shifts) {
        ll i,n=s.size();   
        {   if(i+1<n)
            ll ind=s[i]-'a';
        return s;

Shifting Letters LeetCode Java Solution

class Solution {
    public String shiftingLetters(String s, int[] shifts) {
        int i,n=shifts.length;
        char[] str = s.toCharArray();

        {  if(i+1<n)
            int ind=s.charAt(i)-'a';
            str[i] = (char)('a'+ind);

         return new String(str);

Complexity Analysis of Shifting Letters LeetCode Solution:

Time Complexity

Time complexity is O(N). N is the length of the array. We are traversing the array only once.

Space Complexity

For C++ code space complexity is O(1) as we are not taking any extra space. For Java code, it is O(N) as we are making a new string.

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604Sort Characters By Frequency LeetCode Solution172
605Same Tree LeetCode Solution172
606Bubble sort using two Stacks172
607Painting Fence Algorithm171
608Rotate Image LeetCode Solution171
609Permutation in String Leetcode Solution171
610Reverse a stack without using extra space in O(n)171
611Frog Jump Leetcode Solution171
612Find if an Expression has Duplicate Parenthesis or Not171
613How to check if two given sets are disjoint?171
614Applications of Breadth First Search and Depth First Search171
615Replace Elements with Greatest Element on Right Side Leetcode Solution171
616Sieve of Eratosthenes171
617Minimum Cost to Hire K Workers170
618Smallest Good Base170
619K Empty Slots LeetCode170
620Word Pattern170
621Remove All Occurrences of a Substring LeetCode Solution170
622Word Wrap Problem170
623Sort Array By Parity LeetCode Solution170
624House Robber170
625License Key Formatting Leetcode Solution170
626XOR Operation in an Array Leetcode Solution170
627Find the Duplicate Number LeetCode Solution170
628Longest Increasing Subsequence170
629Distance of nearest cell having 1 in a binary matrix169
630Isomorphic Strings169
631Tracking current Maximum Element in a Stack169
632Defanging an IP Address Leetcode Solution169
633Printing brackets in Matrix Chain Multiplication Problem169
634Best Time to Buy and Sell Stock LeetCode Solution169
635Maximum Consecutive Numbers Present in an Array169
636Non-overlapping sum of two sets169
637Minimum Depth of Binary Tree Leetcode Solution169
638Find Sum of all unique sub-array sum for a given array168
639Wiggle Sort168
640Longest Substring with At Most K Distinct Characters LeetCode Solution168
641Segregate 0s and 1s in an Array168
642Merge Two Balanced Binary Search Trees168
643Coin Change Problem168
644Valid Palindrome II Leetcode Solution168
645Optimal Account Balancing LeetCode Solution168
646Employee Free Time LeetCode Solution167
647Find Maximum Level sum in Binary Tree167
648Check If It Is a Straight Line Leetcode Solution167
649Iterative Method to find Height of Binary Tree167
650Count Good Nodes in Binary Tree Leetcode Solution167
651Binary Tree Zigzag Level Order Traversal LeetCode Solution167
652Sum of All Odd Length Subarrays Leetcode Solution167
653Queries for counts of array elements with values in given range167
654Path With Maximum Minimum Value LeetCode Solution167
655Kth Missing Positive Number Leetcode Solution167
656Moving Average from Data Stream Leetcode Solution167
657How to Create Mergable Stack?167
658Maximum difference between first and last indexes of an element in array167
659Minimum Number of Steps to Make Two Strings Anagram Leetcode Solutions166
660Reorganize String166
661Strobogrammatic Number LeetCode Solution166
662Maximum Number of Occurrences of a Substring Leetcode Solution166
663Best Time to Buy and Sell Stock with Cooldown Leetcode Solution166
664Longest Substring with At Least K Repeating Characters LeetCode Solution166
665GCD Of Two Numbers166
666Find the Distance Value Between Two Arrays Leetcode Solution166
667Find Largest d in Array such that a + b + c = d165
668Letter Combinations of a Phone Number165
669Delete consecutive same words in a sequence165
670Reducing Dishes LeetCode Solution165
671Valid Palindrome165
672Flipping an Image LeetCode Solution165
673Convert an array to reduced form165
674Find pairs with given sum such that elements of pair are in different rows165
675Print the Fibonacci numbers in reverse order165
676To Lower Case Leetcode Solution164
677Check If Two String Arrays are Equivalent Leetcode Solution164
678Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest164
679Factorial Trailing Zeroes Leetcode Solution164
680Remove Invalid Parentheses Leetcode Solution164
681K Empty Slots164
682Partition Labels LeetCode Solution164
683Maximum Number of Coins You Can Get Leetcode Solution164
684BFS vs DFS for Binary Tree164
685Form minimum number from given sequence163
686Partition Array Into Three Parts With Equal Sum Leetcode Solution163
687Populating Next Right Pointers in Each Node163
688Power of Four Leetcode Solution163
689Longest Increasing Path in a Matrix LeetCode Solution163
690Permutation Sequence LeetCode Solution163
691Valid Perfect Square Leetcode Solution163
692Find Leaves of Binary Tree LeetCode Solution163
693Increasing Decreasing String Leetcode Solution163
694Edit Distance LeetCode Solution163
695Recover Binary Search Tree163
696Number of Dice Rolls With Target Sum LeetCode Solution163
697Lucky Numbers in a Matrix Leetcode Solution163
698Delete Nth node from the end of the given linked list163
699Inorder Successor of a node in Binary Tree163
700String to Integer (atoi) LeetCode Solution162
701Check if a queue can be sorted into another queue using a stack162
702Merge Two Binary Trees LeetCode Solution162
703Construct BST from given Preorder Traversal162
704Sort Array by Increasing Frequency Leetcode Solution162
705Subset Sum Leetcode162
706Maximum Product of Two Elements in an Array Leetcode Solution162
707Reversing a Queue using Recursion162
708Unique Paths II Leetcode Solution162
709Ugly Number Leetcode Solution162
710Find the Smallest Divisor given a Threshold Leetcode Solution162
711Dynamic Programming Basics162
712Reverse Only Letters LeetCode Solution161
713Convert a Number to Hexadecimal Leetcode Solution161
714Reservoir Sampling161
715Find whether an array is subset of another array161
716Binomial Coefficient161
717Decompress Run-Length Encoded List Leetcode Solution161
718Robot Room Cleaner Leetcode Solution161
719Binary Tree zigzag level order Traversal161
720Perform String Shifts Leetcode160
721Keyboard Row Leetcode Solution160
722Finding K closest element160
723Majority Element II Leetcode Solution160
724Find the node with minimum value in a Binary Search Tree160
725Add and Search Word – Data structure design LeetCode160
726Restore IP Addresses Leetcode Solution160
727Numbers with prime frequencies greater than or equal to k159
728Hamming Distance Leetcode Solution159
729Race Car LeetCode Solution159
730Check if Two Expressions With Brackets are Same159
731Find the largest multiple of 3159
732Bulb Switcher LeetCode Solution159
733First Unique Character in a String LeetCode Solution158
734Find unique character in a string158
735Minimum Height Trees158
736Number of Islands II LeetCode Solution158
737Rank Transform of an Array Leetcode Solution158
738Find Pair with Greatest Product in Array158
739Non-decreasing Array LeetCode Solution158
740Maximum 69 Number Leetcode Solution158
741Sum of f(a[i], a[j]) over all pairs in an array of n integers158
742Morris Traversal158
743Snakes and Ladders LeetCode Solution158
744Find Maximum Depth of Nested Parenthesis in a String158
745Word Pattern LeetCode Solution158
746Maximum Product of Three Numbers LeetCode Solution158
747Merge K Sorted Linked Lists158
748Queue based approach for first non-repeating character in a stream158
749Generate all possible sorted arrays from alternate elements of two given sorted arrays158
750Student Attendance Record I Leetcode Solution158
751Minimum Distance Between BST Nodes Leetcode Solution158
752Minimum Cost For Tickets Leetcode Solution158
753Minimum time required to rot all oranges158
754Maximum Depth of N-ary Tree Leetcode Solution157
755Invert Binary Tree LeetCode Solution157
756String Compression LeetCode Solution157
757Sorted Linked List to Balanced BST157
758Diagonal Traversal of Binary Tree157
759Find if Path Exists in Graph Leetcode Solution157
760Minimize Maximum Pair Sum in Array LeetCode Solution157
761Longest Span with same Sum in two Binary arrays157
762Tiling Problem157
763Stack Permutations (Check if an array is stack permutation of other)157
764Best Meeting Point LeetCode Solution157
765Largest Rectangle in Histogram LeetCode Solution156
766Binary Tree Maximum Path Sum LeetCode Solution156
767Kth ancestor of a node in binary tree156
768Largest subarray with equal number of 0s and 1s156
769Check If Array Pairs Are Divisible by k LeetCode Solution156
770Special Array With X Elements Greater Than or Equal X Leetcode Solution156
771Symmetric Tree Leetcode Solution156
772Find All Duplicates in an Array LeetCode Solution156
773Remove Nth Node From End of List Leetcode Solution156
774Remove brackets from an algebraic string containing + and – operators156
775Elements to be added so that all elements of a range are present in array156
776Total Numbers With no Repeated Digits in a Range156
777Find Median from Data Stream LeetCode Solution155
778Evaluate Reverse Polish Notation LeetCode Solution155
779k-th missing element in increasing sequence which is not present in a given sequence155
780Maximum Length of a Concatenated String with Unique Characters Leetcode Solution155
781Search a 2D Matrix II Leetcode Solution155
782Largest rectangular sub-matrix whose sum is 0155
783Jump Game155
784Final Prices With a Special Discount in a Shop Leetcode Solution155
785Linked List Cycle155
786Split a String in Balanced Strings Leetcode Solution155
787Partition to K Equal Sum Subsets Leetcode Solution155
788Count items common to both the lists but with different prices154
789Number of NGEs to the Right154
790Deletion in a Binary Tree154
791Check for Palindrome after every character replacement Query154
792Base 7 Leetcode Solution154
793Print a Binary Tree in Vertical Order154
794Valid Number154
795Transpose Graph154
796Sort an array according to the order defined by another array154
797Minimum Jumps to Reach Home LeetCode Solution154
798Program for Bridge and Torch problem154
799Interval Tree154
800Maximum Difference Between Increasing Elements LeetCode Solution154
801Search in a Binary Search Tree Leetcode Solution154
802N-Queens LeetCode Solution154
803Growable array based stack154
804String comparison containing wildcards153
805Minimum Time Visiting All Points Leetcode Solution153
806Merge Sorted Array LeetCode Solution153
807Last Stone Weight II LeetCode Solution153
808Count quadruples from four sorted arrays whose sum is equal to a given value x153
809Longest Subarray Having Count of 1s One More than Count of 0s153
810Minimum number of jumps to reach end153
811Nested List Weight Sum II LeetCode Solution153
812One Edit Distance LeetCode Solution153
813Get Maximum in Generated Array Leetcode Solution153
814Nearest Exit from Entrance in Maze LeetCode Solution153
815Circular Queue153
816Maximum size subarray sum equals k152
817A Space Optimized DP solution for 0-1 Knapsack Problem152
818Number Complement Leetcode Solution152
819Remove Duplicates from Sorted List LeetCode Solution152
820Course Schedule II – LeetCode152
821Crawler Log Folder Leetcode Solution152
822Subarray Product Less Than K LeetCode Solution152
823Iterative Preorder Traversal152
824Find all triplets with zero sum152
825Minimum swaps to make sequences increasing152
826Priority Queue using doubly linked list152
827Maximum Profit in Job Scheduling Leetcode Solution152
828Relative Ranks Leetcode Solution152
829Spiral Matrix II Leetcode Solution152
830Convert BST to Min Heap152
831Remove Duplicates from Sorted List II152
832Reorder Data in Log Files LeetCode Solution152
833Insert into a Binary Search Tree Leetcode Solution151
834Sort Array By Parity II Leetcode Solution151
835Regular Expression Matching151
836Form Minimum Number From Given Sequence151
837Check if a given array can represent Preorder Traversal of Binary Search Tree150
838Subset with sum divisible by m150
839Minimum Swaps to Make Strings Equal Leetcode Solution150
840Sum of nearest smaller and greater number150
841Given an Array of Pairs Find all Symmetric Pairs in it150
842Find the subarray with least average150
843Sort Colors150
844Can Place Flowers LeetCode Solution150
845Valid Parentheses Leetcode Solution150
846Maximum Nesting Depth of the Parentheses Leetcode Solution150
847Binary Search Tree Search and Insertion150
848Brick Wall LeetCode Solution150
849Path with maximum average value150
850Minimum Number of Taps to Open to Water a Garden LeetCode Solution150
851Top K Frequent Words LeetCode Solution150
852Alien Dictionary LeetCode Solution150
853Make Two Arrays Equal by Reversing Sub-arrays Leetcode Solution150
854Brightest Position on Street LeetCode Solution149
855Identify and Mark Unmatched Parenthesis in an Expression149
856Tree Traversal (Preorder, Inorder & Postorder)149
857Level order Traversal in Spiral Form149
858Clone Graph LeetCode Solution149
859Check whether a given Binary Tree is Complete or not149
860Design a Stack With Increment Operation Leetcode Solution149
861Count Distinct Elements in Every Window of Size K149
862Guess Number Higher or Lower LeetCode Solution149
863Partition List Leetcode Solution149
864Balanced Expression with Replacement149
865Find Maximum Sum Possible Equal Sum of Three Stacks149
866Matrix Chain Multiplication149
867Subsequence of Size K With the Largest Even Sum LeetCode Solution149
868Count Negative Numbers in a Sorted Matrix LeetCode Solution149
869Find All Possible Recipes from Given Supplies LeetCode Solution149
870Range LCM Queries149
871Friends Pairing Problem149
872Minimum Sum Path in a Triangle149
873Permutation Coefficient149
874Time Based Key-Value Store LeetCode Solution148
875LCS (Longest Common Subsequence) of three strings148
876An Interesting Method to generate Binary Numbers from 1 to n148
877Find the Only Repetitive Element Between 1 to N-1148
878Diagonal Traverse LeetCode Solution148
879Check if stack elements are pairwise consecutive148
880Missing Element in Sorted Array LeetCode Solution148
881Union and Intersection of two Linked Lists148
882Sorted Array to Balanced BST148
883Best Time to Buy and Sell Stock with Transaction Fee Leetcode Solution148
884Sequences of given length where every element is more than or equal to twice of previous148
885Repeated Substring Pattern LeetCode Solution148
886Diagonal Traversal LeetCode Solution147
887Distinct adjacent elements in an array147
888Three way partitioning of an array around a given range147
889GCDs of given index ranges in an array147
890Guess Number Higher or Lower II147
891Convert Sorted List to Binary Search Tree147
892Water Bottles Leetcode Solution147
893Insert Delete GetRandom147
894Destination City Leetcode Solution147
895Spiral Matrix III LeetCode Solution147
896Design Browser History LeetCode Solution147
897Number of Days Between Two Dates LeetCode Solution147
898BFS for Disconnected Graph147
899K’th Largest Element in BST when modification to BST is not allowed147
900Lemonade Change Leetcode Solution146
901Queue using Stacks146
902Rearrange an Array Such that arr[i] is equal to i146
903Delete And Earn146
904Daily Temperatures Leetcode Solution146
905Maximum Score After Splitting a String Leetcode Solution146
906Minimum sum of multiplications of n numbers146
907Special Positions in a Binary Matrix Leetcode Solution146
908Find Common Characters Leetcode Solution146
909Range sum queries without updates146
910Count ways to reach the nth stair using step 1, 2 or 3146
911Shortest Word Distance Leetcode Solution146
912Find distance between two nodes of a Binary Tree146
913Check if an Array is Stack Sortable146
914Robot Bounded In Circle LeetCode Solution146
915Number of Distinct Islands Leetcode Solution145
916Averages of Levels in Binary Tree145
917Least Number of Unique Integers after K Removals Leetcode Solution145
918Construct Complete Binary Tree from its Linked List Representation145
919Rearrange Array such that arr[i] >= arr[j] if i is even and arr[i] <= arr[j] if i is odd and j < i145
920Alien Dictionary145
921Check if the given array can represent Level Order Traversal of Binary Search Tree145
922Set Matrix Zeroes Leetcode Solution144
923Find all permuted rows of a given row in a matrix144
924Palindrome Partitioning Leetcode Solution144
925Print Fibonacci sequence using 2 variables144
926Construct BST from its given Level Order Traversal144
927Iterative Postorder Traversal Using Two Stacks144
928Vertical sum in a given binary tree144
929Construct the Rectangle Leetcode Solution144
930Rearrange Spaces Between Words Leetcode Solution144
9323 Sum144
933Merge Two Sorted Lists Leetcode144
934Split Array Into Consecutive Subsequences143
935Maximum Frequency Stack Leetcode Solution143
936Largest area rectangular sub-matrix with equal number of 1’s and 0’s143
937Maximum Subarray Sum Excluding Certain Elements143
938Minimum Height Trees LeetCode Solution143
939Stone Game II Leetcode143
940Lexicographical Numbers Leetcode Solution143
941Create Maximum Number143
942Queries for GCD of all numbers of an array except elements in a given range143
943Remove Duplicates from Sorted List II LeetCode Solution143
944Check if any two intervals overlap among a given set of intervals143
945Binary Tree Longest Consecutive Sequence LeetCode Solution143
946Count Subarrays with Same Even and Odd Elements143
947A program to check if a binary tree is BST or not143
948Difference Array | Range update query in O(1)143
949Strongly Connected Component142
950Analyze User Website Visit Pattern LeetCode Solution142
951Trim a Binary Search Tree142
952Longest Palindromic Subsequence142
953Number of Equivalent Domino Pairs Leetcode Solution142
954Three Consecutive Odds Leetcode Solution142
955Sliding Window Maximum142
956Collect maximum points in a grid using two traversals142
957Infix to Postfix142
958Can Make Arithmetic Progression From Sequence Leetcode Solution142
959All Unique Triplets that Sum up to a Given Value142
960Minesweeper LeetCode Solution141
961Find postorder traversal of BST from preorder traversal141
962Unique Paths II141
963Merging Intervals141
964My Calendar I LeetCode Solution141
965Count Submatrices With All Ones LeetCode Solution141
966Dividing Array into Pairs With Sum Divisible by K141
967Shuffle 2n integers as without using extra space141
968Median of Two Sorted Arrays141
969Binary array after M range toggle operations141
970Maximum Product Subarray140
971Count subarrays where second highest lie before highest140
972Boundary Traversal of binary tree140
973Reverse Nodes in K-Group140
974Maximize Sum of Array after K Negations Leetcode Solution140
975Count pair with Given Sum140
976K Closest Points to Origin Leetcode Solution140
977Count Primes in Ranges140
978Length of Longest Fibonacci Subsequence140
979Pattern Occurrences using Stack140
980Height of a generic tree from parent array140
981Kth Smallest Element in a BST Leetcode Solution140
982The Painter’s Partition Problem140
983Longest Nice Substring LeetCode Solution140
984Intersection of Two Linked Lists LeetCode Solution140
985Sign of the Product of an Array LeetCode Solution140
986Word Break140
987Find Maximum of Minimum for Every Window Size in a Given Array139
988Friends Of Appropriate Ages LeetCode Solution139
989Find the Difference Leetcode Solution139
990Palindrome Partitioning139
991Level Order Traversal of Binary Tree139
992Largest Number Leetcode Solution139
993Product of Array Except Self LeetCode Solution139
994Asteroid Collision LeetCode Solution139
995Symmetric Tree139
996Binary Search Tree Delete Operation139
997Climbing stairs139
998Newman-Conway Sequence139
999Find Duplicate Subtrees138
1000Largest Substring Between Two Equal Characters Leetcode Solution138
1001Largest divisible pairs subset138
1002Minimum Index Sum of Two Lists138
1003Maximum Number of Ways to Partition an Array LeetCode Solution138
1004Find number of pairs in an array such that their XOR is 0138
1005Number Of Longest Increasing Subsequence138
1006Scramble String LeetCode Solution138
1007Graph Valid Tree LeetCode Solution138
1008Segment Tree138
1009Check If a Word Occurs As a Prefix of Any Word in a Sentence Leetcode Solution138
1010Valid Boomerang Leetcode Solution138
1011Maximum Sum of 3 Non-Overlapping Subarrays137
1012Shortest Completing Word Leetcode Solution137
1013Merge Sort137
1014String Matching in an Array Leetcode Solution137
1015Construction of Longest Increasing Subsequence (N log N)137
1016Compute nCr % p137
1017Rearrange array such that even positioned are greater than odd137
1018Double the first element and move zero to end137
1019Find the First Circular Tour that visits all the Petrol Pumps137
1020Maximum Length of Repeated Subarray137
1021Boolean Parenthesization Problem137
1022Maximum subsequence sum such that no three are consecutive137
1023Insertion in a Binary Tree137
1024Decrypt String from Alphabet to Integer Mapping Leetcode Solution137
1025The Maze III LeetCode Solution137
1026Breadth First Search (BFS) for a Graph137
1027Depth First Search (DFS) for a Graph137
1028Construct Binary Tree from given Parent Array representation137
1029Maximum Product of Indexes of Next Greater on Left and Right137
1030Number of palindromic paths in a matrix137
1031Binary Search Tree136
1032First missing positive136
1033Make The String Great Leetcode Solution136
1034K maximum sums of overlapping contiguous sub-arrays136
1035Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’136
1036Iterative Depth First Traversal of Graph136
1037Morris Inorder Traversal136
1038Maximum weight transformation of a given string136
1039Level order traversal using two Queues136
1040Next Greater Element III LeetCode Solution136
1041Kill Process LeetCode Solution136
1042Count minimum steps to get the given desired array136
1043Serialize and Deserialize Binary Tree136
1044Ugly Numbers136
1045Partition Equal Subset Sum136
1046Build an Array With Stack Operations Leetcode Solution136
1047Longest subsequence such that difference between adjacents is one135
1048Custom Sort String Leetcode Solution135
1049Add two numbers135
1050Advantages of BST over Hash Table135
1051Design Hit Counter LeetCode Solution135
1052Maximum length subsequence with difference between adjacent elements as either 0 or 1135
1053Invalid Transactions LeetCode Solution135
1054Balanced Binary Tree134
1055Validate Binary Search Tree134
1056Employee Importance LeetCode Solution134
1057Maximum difference between frequency of two elements such that element having greater frequency is also greater134
1058Available Captures for Rook Leetcode Solution134
1059Path Sum II LeetCode Solution134
1060Count pairs from two sorted arrays whose sum is equal to a given value x134
1061Kth Smallest Element in a Sorted Matrix LeetCode Solution133
1062Generate Parentheses Leetcode Solution133
1063Implement Trie (Prefix Tree) Leetcode Solution133
1064Defanging an IP Address LeetCode Solution133
1065Recover Binary Search Tree Leetcode Solution133
1066Ugly Number II LeetCode Solution133
1067Super Ugly Number133
1068Determine Whether Matrix Can Be Obtained By Rotation LeetCode Solution133
1069Bitwise AND of Numbers Range LeetCode Solution133
1070Search in Sorted Rotated Array132
1071Regular Expression Matching Regular Expression Matching LeetCode Solution132
1072Find a Peak Element II LeetCode Solution132
1073Minimum Size Subarray Sum132
1074Find Peak Element132
1075Lowest Common Ancestor132
1076Largest BST Subtree LeetCode Solution132
1077Root to Leaf path with target sum Leetcode Solutions132
1078Move all negative elements to end in order with extra space allowed132
1079Remove Duplicates from Sorted Array II Leetcode Solution132
1080Populating Next Right Pointers in Each Node Leetcode Solution132
1081Number of Closed Islands Leetcode Solution131
1082Longest Bitonic Subsequence131
1083Combination Sum IV LeetCode Solution131
1084Binary Tree Right Side View LeetCode Solution131
1085Number of Students Doing Homework at a Given Time Leetcode Solution131
1086Remove Palindromic Subsequences Leetcode Solution131
1087Types of Binary Tree131
1088Rearrange array such that even index elements are smaller and odd index elements are greater131
1089Subarrays with K Different Integers Leetcode Solution131
1090Binary Tree Data Structure130
1091Clone a Binary Tree with Random Pointers130
1092Maximize Distance to Closest Person LeetCode Solution130
1093Minimum Absolute Difference in BST Leetcode Solution130
1094Count Largest Group Leetcode Solution130
1095Kth Smallest Product of Two Sorted Arrays LeetCode Solution130
1096Number of siblings of a given Node in n-ary Tree130
1097Find Smallest Range Containing Elements from k Lists130
1098Smallest Common Region Leetcode Solution130
1099Day of the Year Leetcode Solution130
1100Find whether a subarray is in form of a mountain or not130
1101Level of Each node in a Tree from source node129
1102Consecutive Characters LeetCode Solution129
1103Find maximum difference between nearest left and right smaller elements129
1104Find the minimum distance between two numbers129
1105Increasing Triplet Subsequence LeetCode Solution129
1106Serialize and Deserialize Binary Tree LeetCode Solution129
1107Convert BST into a Min-Heap without using array129
1108Construct K Palindrome Strings LeetCode Solution129
1109Distinct Subsequences129
1110Next Permutation Leetcode Solution129
1111Path Sum129
1112Palindrome Permutation LeetCode Solution129
1113Construct Binary Tree from Preorder and Postorder Traversal LeetCode Solution128
1114Find Three Element From Different Three Arrays Such That a + b + c = sum128
1115Bottom View of a Binary Tree128
1116Valid Tic-Tac-Toe State LeetCode Solution128
1117Print Next Greater Number of Q queries128
1118Sum of Even Numbers After Queries128
1119Divisible Pairs Counting128
1120Remove duplicates from sorted array128
1121Maximum Product Subarray128
1122Cutting a Rod128
1123Constant time range add operation on an array128
1124Print all triplets in sorted array that form AP128
1125Reformat The String Leetcode Solution128
1126Third Maximum Number Leetcode Solution128
1127Iterative method to find ancestors of a given binary tree128
1128Delete Nodes and Return Forest Leetcode Solution127
1129Thousand Separator Leetcode Solution127
1130Prime Palindrome LeetCode Solution127
1131Products of ranges in an array127
1132Longest Subarray of 1’s After Deleting One Element LeetCode Solution127
1133Mean of Array After Removing Some Elements Leetcode Solution127
1134Write Code to Determine if Two Trees are Identical126
1135Moser-de Bruijn Sequence126
1136Cells with Odd Values in a Matrix LeetCode Solution126
1137Find maximum length Snake sequence126
1138Search Insert Position126
1139Longest Increasing Consecutive Subsequence126
1140Palindromic Substrings Leetcode Solution126
1141Minimum sum of squares of character counts in a given string after removing k characters126
1142Minimum Score Triangulation of Polygon Leetcode Solution126
1143Print Right View of a Binary Tree126
1144Maximum Product of Splitted Binary Tree LeetCode Solution125
1145Swap Nodes In Pairs125
1146Topological Sorting125
1147Merge two BSTs with limited extra space125
1148Queries for Number of Distinct Elements in a Subarray125
1149Red-Black Tree Introduction125
1150Search an Element in Sorted Rotated Array125
1151Closest Binary Search Tree Value Leetcode Solution124
1152Find Two Non-overlapping Sub-arrays Each With Target Sum LeetCode Solution124
1153Diameter of N-Ary Tree LeetCode Solution124
1154Priority Queue124
1155Check Array Formation Through Concatenation Leetcode Solution124
1156Maximum Binary Tree124
1157Subset Sum Problem in O(sum) space124
1158Print modified array after executing the commands of addition and subtraction123
1159Minimum Sideway Jumps LeetCode Solution123
1160Search Suggestions System LeetCode Solution123
1161Find Largest Value in Each Tree Row LeetCode Solution123
1162Kth Smallest Number in Multiplication Table Leetcode Solution123
1163Maximize sum of consecutive differences in a circular array123
1164Possible Bipartition LeetCode Solution123
1165Transform a BST to Greater sum Tree123
1166Golomb sequence123
1167Bus Routes Leetcode Solution123
1168Longest Repeated Subsequence122
1169Rotate Array122
1170Find a sorted subsequence of size 3 in linear time122
1171Remove Max Number of Edges to Keep Graph Fully Traversable Leetcode Solution122
1172Compare Strings by Frequency of the Smallest Character Leetcode Solution122
1173Web Crawler LeetCode Solution122
1174Binary Tree to Binary Search Tree Conversion122
1175Count even length binary sequences with same sum of first and second half bits122
1176Minimum Cost to Move Chips to The Same Position LeetCode Solution122
1177Swapping Nodes in a Linked List Leetcode Solution121
1178Decrease Elements To Make Array Zigzag LeetCode Solution121
1179Find the smallest binary digit multiple of given number121
1180Decision Tree121
1181Graph and its representation121
1182First Bad Version121
1183Matchsticks to Square Leetcode Solution121
1184Number of Orders in the Backlog Leetcode Solution120
1185Lowest Common Ancestor in Binary Search Tree120
1186Count Pairs Whose Products Exist in Array120
1187Given a binary tree, how do you remove all the half nodes?120
1188Reverse a Path in BST using Queue120
1189Convert Sorted Array to Binary Search Tree LeetCode Solutions120
1190Factorial Trailing Zeroes LeetCode Solution120
1191K’th Largest element in BST using constant extra space120
1192Minimum Moves to Equal Array Elements LeetCode Solution120
1193Reformat Date LeetCode Solution120
1194Contiguous Array LeetCode Solution120
1195Valid Triangle Number119
1196Closest Leaf in a Binary Tree LeetCode Solution119
1197How to print maximum number of A’s using given four keys119
1198Queue Reconstruction by Height119
1199Maximum sum of pairs with specific difference119
1200Path Crossing Leetcode Solution119
1201Maximum sum bitonic subarray119
1202Sum of Left Leaves LeetCode Solution119
1203Minimum Swaps To Make Sequences Increasing LeetCode Solution118
1204Range Queries for Longest Correct Bracket Subsequence118
1205Maximum number of segments of lengths a, b and c118
1206Champagne Tower LeetCode Solution118
1207Lowest Common Ancestor of a Binary Tree Leetcode Solution118
1208Maximum Depth Of Binary Tree118
1209Moving Stones Until Consecutive Leetcode Solution118
1210Kth Smallest Element in a BST117
1211Concatenation of Array LeetCode Solution117
1212Array Queries for multiply replacements and product117
1213Integer Break LeetCode Solution117
1214BST to a Tree with Sum of all Smaller Keys117
1215Filter Restaurants by Vegan-Friendly, Price and Distance Leetcode Solution117
1216Divide Two Integers Leetcode Solution117
1217Guess The Word117
1218LRU Cache Leetcode Solution116
1219Convert Integer to the Sum of Two No-Zero Integers Leetcode Solution116
1220Perfect Squares LeetCode Solution116
1221Replace two consecutive equal values with one greater116
1222Write a function to get the intersection point of two Linked Lists116
1223Check if all levels of two Binary Tree are anagrams or not116
1224New 21 Game115
1225Maximum Value at a Given Index in a Bounded Array LeetCode Solution115
1226Maximum sum of a path in a Right Number Triangle115
1227Flatten 2D Vector LeetCode Solution115
1228Maximum Array from Two given Arrays Keeping Order Same115
1229Arithmetic Slices II – Subsequence LeetCode Solution115
1230Power of Two115
1231Sliding Window Median Leetcode Solution115
1232Valid Perfect Square LeetCode Solution115
1233Queries on Probability of Even or Odd Number in given Ranges115
1234Range Sum Query using Sparse Table115
1235Maximize Elements Using Another Array114
1236Check if each internal node of a BST has exactly one child114
1237Mean of range in array114
1238Design Skiplist LeetCode Solution114
1239The kth Factor of n Leetcode Solution114
1240Check Completeness of a Binary Tree LeetCode Solution114
1241Check for Identical BSTs without building the trees114
1242Find Minimum in Rotated Sorted Array II LeetCode Solution114
1243Largest Plus Sign Leetcode Solution113
1244Longest Common Prefix Using Word by Word Matching113
1245Print modified array after multiple array range increment operations113
1246Find k-th smallest element in BST (Order Statistics in BST)113
1247Parallel Courses II LeetCode Solution113
1248Bold Words in String LeetCode Solution113
1249Graph Cloning113
1250Contiguous Array113
1251Find minimum number of merge operations to make an array palindrome112
1252Print n terms of Newman-Conway Sequence112
1253Count Subsets Having Distinct Even Numbers112
1254Print Ancestors of a Given Binary Tree Node Without Recursion112
1255Symmetric Tree LeetCode Solution Leetcode Solution112
1256Missing Number111
1257Maximum Product Subarray111
1258Merge k Sorted Lists Leetcode Solution111
1259Check if two nodes are on the same path in a Tree110
1260Verify Preorder Serialization of a Binary Tree110
1261Count and Toggle Queries on a Binary Array110
1262Minimum Remove to Make Valid Parentheses LeetCode Solution110
1263Excel Sheet Column Title LeetCode Solution110
1264Image Overlap LeetCode Solution110
1265Smallest Range II Leetcode Solution110
1266Number of elements less than or equal to a given number in a given subarray109
1267Next greater element109
1268Palindrome Partitioning108
1269Minimum Time to Collect All Apples in a Tree LeetCode Solution108
1270Check If a String Can Break Another String Leetcode Solution108
1271Different Ways to Add Parentheses Leetcode Solution107
1272Min Cost Climbing Stairs LeetCode Solution107
1273Koko Eating Bananas LeetCode Solution107
1274Orderly Queue LeetCode Solution107
1275Peeking Iterator LeetCode Solution106
1276Largest Submatrix With Rearrangements LeetCode Solution106
1277Newman–Shanks–Williams prime105
1278Longest Substring Without Repeating Characters Leetcode Solution105
1279Check if X can give change to every person in the Queue105
1280Merge Sorted Array104
1281Check in binary array the number represented by a subarray is odd or even104
1282Range Minimum Query (Square Root Decomposition and Sparse Table)103
1283Array Nesting Leetcode Solution102
1284Queries for Decimal Values of Subarrays of a Binary Array102
1285Encoded String With Shortest Length LeetCode Solution102
1286Arranging Coins Leetcode Solution101
1287Maximum Sum Increasing Subsequence101
1288Maximum product of an increasing subsequence100
1289Find maximum average subarray of k length100
1290Check given array of size n can represent BST of n levels or not99
1291Minimum Total Space Wasted With K Resizing Operations LeetCode Solution99
1292Convert a BST to a Binary Tree such that sum of all greater keys is added to every key99
1293Number of indexes with equal elements in given range99
1294Convert to Base -2 LeetCode Solution98
1295Find the Winner of the Circular Game LeetCode Solution98
1296Minimum Number of People to Teach LeetCode Solution98
1297Random Pick Index LeetCode Solution97
1298Reach a Number LeetCode Solution97
1299Add Two Numbers II Leetcode Solution97
1300Continuous Subarray Sum LeetCode Solution97
1301Binary Tree to Binary Search Tree Conversion using STL set96
1302Vertical Order Traversal of Binary Tree LeetCode Solution96
1303Jump Game IV LeetCode Solution96
1304Queries on XOR of greatest odd divisor of the range95
1305Number of Subsequences That Satisfy the Given Sum Condition 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 Solution88
1312Design A Leaderboard Leetcode Solution87
1313Substring with Concatenation of All Words Leetcode Solution84
1314Minimum Swaps to Group All 1’s Together Leetcode Solution83
1315Top K Frequent Elements LeetCode Solution83
1316Shifting Letters LeetCode Solution82
1317Minimum Path Sum Leetcode Solution81
1318Count Sub Islands LeetCode Solution81
1319Binary Tree Inorder Traversal LeetCode Solution81
1320Longest Common Subsequence LeetCode Solution78
1321Odd Even Linked List Leetcode Solution77
1322Maximum Population Year LeetCode Solution77
1323Decode String Leetcode Solution76
1324Best Meeting Point LeetCode Solution76
1325Find the Town Judge LeetCode Solution76
1326Find the Town Judge LeetCode Solution75
1327Shortest Unsorted Continuous Subarray LeetCode Solution75
1328Sum Root to Leaf Numbers LeetCode Solution74
1329Rectangle Overlap LeetCode Solution71
1330Maximum Population Year LeetCode Solution71
1331Design Add and Search Words Data Structure LeetCode Solution70
1332Flatten Binary Tree to Linked List LeetCode Solution69
1333Score of Parenthesis LeetCode Solution67
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
1344Find K Closest Elements LeetCode Solution43
1345Sort Colors LeetCode Solution43
1346Rotate String LeetCode Solution39
1347Maximum Side Length of a Square with Sum Less than or Equal to Threshold LeetCode Solution39
1348Excel Sheet Column Number LeetCode Solution38
1349H-Index Leetcode Solution20
1350Maximum Size Subarray Sum Equals k Leetcode Solution20
1351High Five LeetCode Solution19
1352Camelcase Matching Leetcode Solution16
1353Monotonic Array Leetcode Solution15
1354Insert Delete GetRandom O(1) – Duplicates allowed LeetCode Solution12
1355Group Shifted Strings Leetcode Solution12
1356Unique Binary Search Trees LeetCode Solution11
1357Peak Index in a Mountain Array LeetCode Solution11
1358Valid Triangle Number LeetCode Solution9
1359Isomorphic Strings LeetCode Solution9
1360Swim in Rising Water LeetCode Solution7
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