Maximum Side Length of a Square with Sum Less than or Equal to Threshold LeetCode Solution

Difficulty Level Medium
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Problem Statement

Maximum Side Length of a Square with Sum Less than or Equal to Threshold,” says that  a m x n matrix mat and an integer threshold are given, return the maximum side-length of a square with a sum less than or equal to threshold or return 0 if there is no such square.

Example 1:

1292. Maximum Side Length of a Square with Sum Less than or Equal to ThresholdPinInput:

 mat = [[1,1,3,2,4,3,2],[1,1,3,2,4,3,2],[1,1,3,2,4,3,2]], threshold = 4

Output:

 2

Explanation:

 The maximum side length of square with sum less than 4 is 2 as shown.

Example 2:

Input:

 mat = [[2,2,2,2,2],[2,2,2,2,2],[2,2,2,2,2],[2,2,2,2,2],[2,2,2,2,2]], threshold = 1

Output:

 0

 

Constraints:

  • m == mat.length
  • n == mat[i].length
  • 1 <= m, n <= 300
  • 0 <= mat[i][j] <= 104
  • 0 <= threshold <= 105

Approach

Idea

1. This problem can be solved using the binary-search and prefix sum method.

2. pre[i][j]  is the sum of all elements from rectangle (0,0,i,j) as left,top,right,bottom.

3. To calculate the pref[i][j], we will use this relation pre[i][j]=pre[i-1][j]+pre[i][j-1]+mat[i-1][j-1]-pre[i-1][j-1].

4. Since the value in the matrix is positive, so we can use binary search to find the appropriate square length k.

5. Now we will make a check function and simulate our answer as it’s satisfied or not.

6. See the below code for better visualization.

Code

Maximum Side Length of a Square with Sum Less than or Equal to Threshold LeetCode C++ Solution

class Solution {
public:
    #define ll long long
    ll check(ll len,vector<vector<ll>>&a,ll yo,ll n,ll m)
    {
        ll i,j;
        for(i=len;i<=n;i++)
        {
            for(j=len;j<=m;j++)
            {
                 if (a[i][j] - a[i-len][j] - a[i][j-len] + a[i-len][j-len] <= yo) return 1;

            }
        }
        return 0;
    }
    int maxSideLength(vector<vector<int>>& mat, int threshold) {
        ll n=mat.size(),m=mat[0].size();
        vector<vector<ll>>pre(n+1,vector<ll>(m+1,0));
        ll i,j;
        for(i=1;i<=n;i++)
        {
            for(j=1;j<=m;j++)
            {
                pre[i][j]=pre[i-1][j]+pre[i][j-1]+mat[i-1][j-1]-pre[i-1][j-1];
               
            }
          
        }
        
        ll l=1,r=min(n,m),mid,ans=0;
                 
        while(l<=r)
        {
            mid=l+(r-l)/2;
            if(check(mid,pre,threshold,n,m))
            {
                l=mid+1;
                ans=mid;
            }
            else
            {
                r=mid-1;
            }
        }
        return ans;
    }
};

Maximum Side Length of a Square with Sum Less than or Equal to Threshold LeetCode Java Solution

class Solution {
  int[][] pre = new int[302][302];
  int check(int len,int yo,int n,int m)
    {
        int i,j;
        for(i=len;i<=n;i++)
        {
            for(j=len;j<=m;j++)
            {
                 if (pre[i][j] - pre[i-len][j] - pre[i][j-len] + pre[i-len][j-len] <= yo) return 1;

            }
        }
        return 0;
    }
    public int maxSideLength(int[][] mat, int threshold) {
          int n=mat.length,m=mat[0].length;
          int i,j;
          for(i=0;i<=n;i++)
              for(j=0;j<=m;j++)
                  pre[i][j]=0;
       
        
        for(i=1;i<=n;i++)
        {
            for(j=1;j<=m;j++)
            {
                pre[i][j]=pre[i-1][j]+pre[i][j-1]+mat[i-1][j-1]-pre[i-1][j-1];
               
            }
          
        }
        
        int l=1,r=Math.min(n,m),mid,ans=0;           
        while(l<=r)
        {
            mid=l+(r-l)/2;
            if(check(mid,threshold,n,m)==1)
            {
                l=mid+1;
                ans=mid;
                
            }
            else
            {
                r=mid-1;
            }
        }
        
        return ans;
    }
}

Complexity analysis:

Time Complexity

Time complexity is O(m*n*log(min(m,n))), where m,n is the dimension of the array. Log factor comes due to binary search and check function is O(m*n).

Space Complexity

Space complexity is O(m*n).where m,n is the dimension of the array. We are taking extra space to precompute the array.

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528Find distinct elements common to all rows of a matrix174
529Find any one of the multiple repeating elements in read only array174
530Find Index of Closing Bracket for a Given Opening Bracket in an Expression174
531Relative Sort Array Leetcode Solution174
532Substring With Concatenation Of All Words174
533Iterative Inorder Traversal of a Binary Tree174
534Smallest Subarray With all Occurrences of a Most Frequent Element174
535Longest Common Prefix using Sorting174
536Excel Sheet Column Title Leetcode Solution173
537Container with Most Water173
538Valid Sudoku173
539N-th Tribonacci Number Leetcode Solution173
540Largest Perimeter Triangle Leetcode Solution173
541Implementation of Deque using circular array173
542Count number of triplets with product equal to given number173
543Recursion173
544Is Subsequence Leetcode Solution173
545Implement Stack using Queues173
546Contiguous Array Leetcode173
547Sum of Left Leaves Leetcode Solutions172
548First negative integer in every window of size k172
549Maximum sum rectangle in a 2D matrix172
55001 Matrix LeetCode Solution172
551Build Array From Permutation Leetcode Solution172
552Delete Node in a Linked List Leetcode Solution172
553Next Greater Frequency Element172
554Isomorphic Strings Leetcode Solution172
555Best Time to Buy and Sell Stock172
556Find Words That Can Be Formed by Characters Leetcode Solution171
557Valid Anagrams171
558Linked List Cycle II LeetCode Solution171
559Minimum Delete Operations to make all Elements of Array Same171
560Trapping Rain Water LeetCode Solution171
561Distribute Candies to People Leetcode Solution171
562Island Perimeter Leetcode Solution171
563Convert a normal BST to Balanced BST171
564Count the number of nodes at given level in a tree using BFS170
565Jewels and Stones Leetcode Solution170
566Remove Linked List Elements Leetcode Solution170
567Arrange given numbers to form the biggest number170
568Minimum Operations to convert X to Y170
569Hamming Distance170
570Shuffle an Array170
571Minimum Bracket Reversals170
572Convert Sorted Array to Binary Search Tree Leetcode Solution169
573Integer to Roman169
574Gold Mine Problem169
575Count all subsequences having product less than K169
576Assign Cookies Leetcode Solution169
577The Knapsack Problem169
578Rearrange a binary string as alternate x and y occurrences169
579Summary Ranges Leetcode Solution168
580Find the smallest positive integer value that cannot be represented as sum of any subset of a given array168
581Minimum Knight Moves LeetCode Solution168
582Change the Array into Permutation of Numbers From 1 to N168
583Maximum path sum in a triangle168
584Group Multiple Occurrence of Array Elements Ordered by first Occurrence168
585Shortest Path in a Grid with Obstacles Elimination LeetCode Solution168
586Insert Interval Leetcode Solution168
587Check for Balanced Parentheses in an Expression168
588Minimum number of distinct elements after removing m items167
589Decode Ways167
590K Empty Slots LeetCode167
591Rotate List Leetcode Solution167
592Unique Binary Search Trees167
5933Sum Closest LeetCode Solution167
594Distance Between Bus Stops Leetcode Solution166
595Same Tree LeetCode Solution166
596Rotate Image LeetCode Solution166
597How to check if two given sets are disjoint?166
598LRU Cache LeetCode Solution166
599Sieve of Eratosthenes166
600Combinations Leetcode Solution166
601XOR Operation in an Array Leetcode Solution165
602Remove All Occurrences of a Substring LeetCode Solution165
603Find minimum difference between any two elements165
604Permutation in String Leetcode Solution165
605Maximum difference between first and last indexes of an element in array165
606Frog Jump Leetcode Solution165
607Segregate 0s and 1s in an Array164
608Maximum Distance in Array164
609Find Sum of all unique sub-array sum for a given array164
610Painting Fence Algorithm164
611Best Time to Buy and Sell Stock LeetCode Solution164
612Minimum number of subsets with distinct elements164
613Printing brackets in Matrix Chain Multiplication Problem164
614Word Pattern164
615Sort Characters By Frequency LeetCode Solution164
616Stone Game LeetCode163
617Smallest Good Base163
618Sort Array By Parity LeetCode Solution163
619Minimum insertions to form a palindrome with permutations allowed163
620Find if an Expression has Duplicate Parenthesis or Not163
621Word Wrap Problem163
622Minimum Depth of Binary Tree Leetcode Solution163
623Applications of Breadth First Search and Depth First Search162
624Coin Change Problem162
625Maximum Number of Chocolates to be Distributed Equally Among k Students162
626Defanging an IP Address Leetcode Solution162
627Replace Elements with Greatest Element on Right Side Leetcode Solution162
628Find the Duplicate Number LeetCode Solution162
629Distance of nearest cell having 1 in a binary matrix162
630License Key Formatting Leetcode Solution162
631Rearrange an array in order – smallest, largest, 2nd smallest, 2nd largest161
632Kth Missing Positive Number Leetcode Solution161
633Minimum Cost to Hire K Workers161
634House Robber161
635Tracking current Maximum Element in a Stack161
636Sum of All Odd Length Subarrays Leetcode Solution160
637Longest Increasing Subsequence160
638Optimal Account Balancing LeetCode Solution160
639Count Good Nodes in Binary Tree Leetcode Solution160
640Find Maximum Level sum in Binary Tree160
641Maximum Consecutive Numbers Present in an Array160
642Longest Substring with At Most K Distinct Characters LeetCode Solution160
643Binary Tree Zigzag Level Order Traversal LeetCode Solution160
644Isomorphic Strings160
645Iterative Method to find Height of Binary Tree160
646Power of Four Leetcode Solution160
647Minimum Number of Steps to Make Two Strings Anagram Leetcode Solutions160
648Valid Palindrome II Leetcode Solution160
649GCD Of Two Numbers159
650K Empty Slots159
651Reverse a stack without using extra space in O(n)159
652Merge Two Balanced Binary Search Trees159
653Delete consecutive same words in a sequence159
654Best Time to Buy and Sell Stock with Cooldown Leetcode Solution159
655Moving Average from Data Stream Leetcode Solution159
656Non-overlapping sum of two sets159
657Check If It Is a Straight Line Leetcode Solution159
658Number of Provinces Leetcode Solution158
659Queries for counts of array elements with values in given range158
660Maximum Number of Coins You Can Get Leetcode Solution158
661Letter Combinations of a Phone Number158
662Largest Sum Contiguous Subarray158
663Check If Two String Arrays are Equivalent Leetcode Solution158
664Convert an array to reduced form158
665Ugly Number Leetcode Solution158
666Strobogrammatic Number LeetCode Solution158
667String to Integer (atoi) LeetCode Solution158
668Find the Smallest Divisor given a Threshold Leetcode Solution157
669Print the Fibonacci numbers in reverse order157
670Number of Dice Rolls With Target Sum LeetCode Solution157
671Reducing Dishes LeetCode Solution157
672How to Create Mergable Stack?157
673Longest Substring with At Least K Repeating Characters LeetCode Solution157
674Lucky Numbers in a Matrix Leetcode Solution157
675Reorganize String157
676Find Largest d in Array such that a + b + c = d157
677Flipping an Image LeetCode Solution157
678Wiggle Sort157
679Employee Free Time LeetCode Solution157
680Partition Labels LeetCode Solution157
681Increasing Decreasing String Leetcode Solution157
682Reverse Only Letters LeetCode Solution157
683Longest Increasing Path in a Matrix LeetCode Solution157
684Subset Sum Leetcode157
685Path With Maximum Minimum Value LeetCode Solution156
686Maximum Number of Occurrences of a Substring Leetcode Solution156
687Find the Distance Value Between Two Arrays Leetcode Solution156
688Sum of f(a[i], a[j]) over all pairs in an array of n integers156
689Inorder Successor of a node in Binary Tree156
690Find whether an array is subset of another array156
691Form minimum number from given sequence156
692Check if a queue can be sorted into another queue using a stack156
693Valid Palindrome156
694Find Leaves of Binary Tree LeetCode Solution156
695Delete Nth node from the end of the given linked list155
696Unique Paths II Leetcode Solution155
697Reversing a Queue using Recursion155
698Valid Perfect Square Leetcode Solution155
699Merge Two Binary Trees LeetCode Solution155
700Populating Next Right Pointers in Each Node155
701To Lower Case Leetcode Solution155
702Permutation Sequence LeetCode Solution155
703Reservoir Sampling155
704BFS vs DFS for Binary Tree155
705Binary Tree zigzag level order Traversal155
706Recover Binary Search Tree155
707Add and Search Word – Data structure design LeetCode154
708Rank Transform of an Array Leetcode Solution154
709Majority Element II Leetcode Solution154
710Sort Array by Increasing Frequency Leetcode Solution154
711Hamming Distance Leetcode Solution154
712Edit Distance LeetCode Solution154
713Find pairs with given sum such that elements of pair are in different rows154
714Dynamic Programming Basics154
715Maximum Product of Two Elements in an Array Leetcode Solution154
716Construct BST from given Preorder Traversal154
717Robot Room Cleaner Leetcode Solution154
718Maximum Product of Three Numbers LeetCode Solution153
719Decompress Run-Length Encoded List Leetcode Solution153
720Numbers with prime frequencies greater than or equal to k153
721Keyboard Row Leetcode Solution153
722Remove Invalid Parentheses Leetcode Solution153
723Partition Array Into Three Parts With Equal Sum Leetcode Solution153
724Convert a Number to Hexadecimal Leetcode Solution153
725Find the node with minimum value in a Binary Search Tree153
726Factorial Trailing Zeroes Leetcode Solution153
727Longest Span with same Sum in two Binary arrays152
728Bulb Switcher LeetCode Solution152
729Stack Permutations (Check if an array is stack permutation of other)152
730String Compression LeetCode Solution152
731Deletion in a Binary Tree152
732Queue based approach for first non-repeating character in a stream152
733Find unique character in a string151
734Find All Duplicates in an Array LeetCode Solution151
735Non-decreasing Array LeetCode Solution151
736Race Car LeetCode Solution151
737Find Maximum Depth of Nested Parenthesis in a String151
738Symmetric Tree Leetcode Solution151
739Largest subarray with equal number of 0s and 1s151
740Find the largest multiple of 3151
741Maximum 69 Number Leetcode Solution150
742Sorted Linked List to Balanced BST150
743Binomial Coefficient150
744Invert Binary Tree LeetCode Solution150
745First Unique Character in a String LeetCode Solution150
746Maximum Length of a Concatenated String with Unique Characters Leetcode Solution150
747Bubble sort using two Stacks150
748Find if Path Exists in Graph Leetcode Solution150
749Linked List Cycle150
750Find Pair with Greatest Product in Array150
751Remove Nth Node From End of List Leetcode Solution150
752Restore IP Addresses Leetcode Solution150
753Minimize Maximum Pair Sum in Array LeetCode Solution150
754Minimum Height Trees150
755Perform String Shifts Leetcode150
756Generate all possible sorted arrays from alternate elements of two given sorted arrays150
757Word Pattern LeetCode Solution150
758Minimum Distance Between BST Nodes Leetcode Solution150
759Minimum Cost For Tickets Leetcode Solution150
760Binary Tree Maximum Path Sum LeetCode Solution150
761k-th missing element in increasing sequence which is not present in a given sequence150
762Best Meeting Point LeetCode Solution149
763Search in a Binary Search Tree Leetcode Solution149
764Kth ancestor of a node in binary tree149
765Remove Duplicates from Sorted List LeetCode Solution149
766Number of Islands II LeetCode Solution149
767Evaluate Reverse Polish Notation LeetCode Solution149
768Count quadruples from four sorted arrays whose sum is equal to a given value x149
769Maximum Difference Between Increasing Elements LeetCode Solution149
770Finding K closest element149
771Diagonal Traversal of Binary Tree149
772N-Queens LeetCode Solution149
773Elements to be added so that all elements of a range are present in array149
774Growable array based stack149
775Morris Traversal149
776Student Attendance Record I Leetcode Solution149
777Merge K Sorted Linked Lists149
778Jump Game149
779Find Median from Data Stream LeetCode Solution149
780Program for Bridge and Torch problem148
781Number Complement Leetcode Solution148
782Valid Number148
783Snakes and Ladders LeetCode Solution148
784Search a 2D Matrix II Leetcode Solution148
785Remove brackets from an algebraic string containing + and – operators148
786Minimum Time Visiting All Points Leetcode Solution148
787Minimum time required to rot all oranges148
788Split a String in Balanced Strings Leetcode Solution148
789Largest rectangular sub-matrix whose sum is 0148
790Check for Palindrome after every character replacement Query147
791Maximum Depth of N-ary Tree Leetcode Solution147
792Relative Ranks Leetcode Solution147
793Number of NGEs to the Right147
794Sort an array according to the order defined by another array147
795Nearest Exit from Entrance in Maze LeetCode Solution147
796Get Maximum in Generated Array Leetcode Solution147
797Largest Rectangle in Histogram LeetCode Solution147
798Remove Duplicates from Sorted List II147
799Merge Sorted Array LeetCode Solution147
800Special Array With X Elements Greater Than or Equal X Leetcode Solution147
801Nested List Weight Sum II LeetCode Solution147
802Minimum number of jumps to reach end147
803Transpose Graph147
804Crawler Log Folder Leetcode Solution146
805Friends Pairing Problem146
806Final Prices With a Special Discount in a Shop Leetcode Solution146
807A Space Optimized DP solution for 0-1 Knapsack Problem146
808Tiling Problem146
809Circular Queue146
810Sort Colors146
811Print a Binary Tree in Vertical Order146
812Base 7 Leetcode Solution146
813One Edit Distance LeetCode Solution146
814Minimum Number of Taps to Open to Water a Garden LeetCode Solution146
815Partition to K Equal Sum Subsets Leetcode Solution146
816Count items common to both the lists but with different prices146
817Sort Array By Parity II Leetcode Solution146
818Check If Array Pairs Are Divisible by k LeetCode Solution146
819Convert BST to Min Heap146
820String comparison containing wildcards146
821Minimum swaps to make sequences increasing145
822Interval Tree145
823Reorder Data in Log Files LeetCode Solution145
824Subarray Product Less Than K LeetCode Solution145
825Path with maximum average value145
826Sorted Array to Balanced BST145
827Check if Two Expressions With Brackets are Same145
828Subsequence of Size K With the Largest Even Sum LeetCode Solution145
829Clone Graph LeetCode Solution145
830Alien Dictionary LeetCode Solution145
831Minimum Swaps to Make Strings Equal Leetcode Solution144
832Regular Expression Matching144
833Maximum size subarray sum equals k144
834Course Schedule II – LeetCode144
835Total Numbers With no Repeated Digits in a Range144
836Longest Subarray Having Count of 1s One More than Count of 0s144
837Iterative Preorder Traversal144
838Partition List Leetcode Solution144
839Guess Number Higher or Lower LeetCode Solution144
840Minimum Jumps to Reach Home LeetCode Solution144
841Level order Traversal in Spiral Form144
842Find the subarray with least average144
843Design a Stack With Increment Operation Leetcode Solution144
844Insert into a Binary Search Tree Leetcode Solution144
845Make Two Arrays Equal by Reversing Sub-arrays Leetcode Solution144
846Priority Queue using doubly linked list143
847Permutation Coefficient143
848Brightest Position on Street LeetCode Solution143
849Maximum Profit in Job Scheduling Leetcode Solution143
850Subset with sum divisible by m143
851Can Place Flowers LeetCode Solution143
852Find the Only Repetitive Element Between 1 to N-1143
853Union and Intersection of two Linked Lists143
854Find all triplets with zero sum143
855Top K Frequent Words LeetCode Solution143
856Count Distinct Elements in Every Window of Size K143
857Last Stone Weight II LeetCode Solution143
858Check if a given array can represent Preorder Traversal of Binary Search Tree143
859Minimum Sum Path in a Triangle142
860Check whether a given Binary Tree is Complete or not142
861Three way partitioning of an array around a given range142
862Find All Possible Recipes from Given Supplies LeetCode Solution142
863Valid Parentheses Leetcode Solution142
864Maximum Nesting Depth of the Parentheses Leetcode Solution142
865Water Bottles Leetcode Solution142
866Given an Array of Pairs Find all Symmetric Pairs in it142
867Brick Wall LeetCode Solution142
868Lemonade Change Leetcode Solution141
869Check if an Array is Stack Sortable141
870Range sum queries without updates141
871Matrix Chain Multiplication141
872Tree Traversal (Preorder, Inorder & Postorder)141
873Count ways to reach the nth stair using step 1, 2 or 3141
874Repeated Substring Pattern LeetCode Solution141
875Sum of nearest smaller and greater number141
876Design Browser History LeetCode Solution141
877Binary Search Tree Search and Insertion141
878Least Number of Unique Integers after K Removals Leetcode Solution141
879Form Minimum Number From Given Sequence141
880LCS (Longest Common Subsequence) of three strings141
881Rearrange Spaces Between Words Leetcode Solution141
8824Sum141
883Spiral Matrix II Leetcode Solution141
884Count Negative Numbers in a Sorted Matrix LeetCode Solution140
885Find all permuted rows of a given row in a matrix140
886An Interesting Method to generate Binary Numbers from 1 to n140
887Maximum Score After Splitting a String Leetcode Solution140
888Shortest Word Distance Leetcode Solution140
889Insert Delete GetRandom140
890Construct Complete Binary Tree from its Linked List Representation140
891Distinct adjacent elements in an array140
892Count Subarrays with Same Even and Odd Elements140
893GCDs of given index ranges in an array140
894Guess Number Higher or Lower II140
895Best Time to Buy and Sell Stock with Transaction Fee Leetcode Solution140
896Daily Temperatures Leetcode Solution140
897Delete And Earn140
898Destination City Leetcode Solution140
899Robot Bounded In Circle LeetCode Solution139
900Missing Element in Sorted Array LeetCode Solution139
901Diagonal Traversal LeetCode Solution139
902Queries for GCD of all numbers of an array except elements in a given range139
903Find Maximum Sum Possible Equal Sum of Three Stacks139
904Number of Days Between Two Dates LeetCode Solution139
905Check if stack elements are pairwise consecutive139
906Rearrange an Array Such that arr[i] is equal to i139
907Identify and Mark Unmatched Parenthesis in an Expression139
908A program to check if a binary tree is BST or not139
909Sequences of given length where every element is more than or equal to twice of previous139
910Convert Sorted List to Binary Search Tree139
911Set Matrix Zeroes Leetcode Solution139
912Minimum sum of multiplications of n numbers138
913Range LCM Queries138
914Time Based Key-Value Store LeetCode Solution138
915Diagonal Traverse LeetCode Solution138
916Find Common Characters Leetcode Solution138
917Vertical sum in a given binary tree138
918Alien Dictionary138
919Find distance between two nodes of a Binary Tree138
920Check if the given array can represent Level Order Traversal of Binary Search Tree138
921BFS for Disconnected Graph138
922Balanced Expression with Replacement138
923Special Positions in a Binary Matrix Leetcode Solution138
924Merge Two Sorted Lists Leetcode137
925Stone Game II Leetcode137
926Remove Duplicates from Sorted List II LeetCode Solution137
927Number of Distinct Islands Leetcode Solution137
928Palindrome Partitioning Leetcode Solution137
929Spiral Matrix III LeetCode Solution137
930Merging Intervals137
931Rearrange Array such that arr[i] >= arr[j] if i is even and arr[i] <= arr[j] if i is odd and j < i137
932Longest Palindromic Subsequence137
933Queue using Stacks136
934Number of Equivalent Domino Pairs Leetcode Solution136
935Averages of Levels in Binary Tree136
9363 Sum136
937Infix to Postfix136
938K’th Largest Element in BST when modification to BST is not allowed136
939Construct the Rectangle Leetcode Solution136
940Maximum Frequency Stack Leetcode Solution136
941Maximize Sum of Array after K Negations Leetcode Solution136
942Sliding Window Maximum136
943Maximum Subarray Sum Excluding Certain Elements136
944Print Fibonacci sequence using 2 variables136
945Lexicographical Numbers Leetcode Solution136
946Analyze User Website Visit Pattern LeetCode Solution136
947Can Make Arithmetic Progression From Sequence Leetcode Solution136
948Binary Tree Longest Consecutive Sequence LeetCode Solution135
949Difference Array | Range update query in O(1)135
950Dividing Array into Pairs With Sum Divisible by K135
951Trim a Binary Search Tree135
952Construct BST from its given Level Order Traversal135
953Binary array after M range toggle operations135
954Largest area rectangular sub-matrix with equal number of 1’s and 0’s135
955Median of Two Sorted Arrays135
956Pattern Occurrences using Stack135
957Minimum Height Trees LeetCode Solution135
958Three Consecutive Odds Leetcode Solution135
959Word Break134
960All Unique Triplets that Sum up to a Given Value134
961Largest divisible pairs subset134
962Check if any two intervals overlap among a given set of intervals134
963Largest Substring Between Two Equal Characters Leetcode Solution134
964Check If a Word Occurs As a Prefix of Any Word in a Sentence Leetcode Solution134
965Newman-Conway Sequence134
966Strongly Connected Component134
967Find postorder traversal of BST from preorder traversal134
968Height of a generic tree from parent array134
969Intersection of Two Linked Lists LeetCode Solution134
970Count Submatrices With All Ones LeetCode Solution133
971Palindrome Partitioning133
972Binary Search Tree Delete Operation133
973Find Maximum of Minimum for Every Window Size in a Given Array133
974Symmetric Tree133
975Maximum Product Subarray133
976Shuffle 2n integers as a1-b1-a2-b2-a3-b3-..bn without using extra space133
977Iterative Postorder Traversal Using Two Stacks133
978Create Maximum Number133
979Kth Smallest Element in a BST Leetcode Solution133
980Reverse Nodes in K-Group133
981Breadth First Search (BFS) for a Graph133
982Depth First Search (DFS) for a Graph133
983Segment Tree133
984Product of Array Except Self LeetCode Solution133
985Split Array Into Consecutive Subsequences133
986First missing positive133
987Sign of the Product of an Array LeetCode Solution132
988Boundary Traversal of binary tree132
989Length of Longest Fibonacci Subsequence132
990Climbing stairs132
991Rearrange array such that even positioned are greater than odd132
992Find Duplicate Subtrees132
993The Maze III LeetCode Solution132
994My Calendar I LeetCode Solution132
995Count pair with Given Sum132
996Asteroid Collision LeetCode Solution132
997Maximum subsequence sum such that no three are consecutive132
998Minesweeper LeetCode Solution132
999Level Order Traversal of Binary Tree132
1000Count Primes in Ranges132
1001Find the First Circular Tour that visits all the Petrol Pumps131
1002Partition Equal Subset Sum131
1003Longest Nice Substring LeetCode Solution131
1004Longest subsequence such that difference between adjacents is one131
1005Maximum Number of Ways to Partition an Array LeetCode Solution131
1006Double the first element and move zero to end131
1007Find the Difference Leetcode Solution131
1008Make The String Great Leetcode Solution131
1009Kill Process LeetCode Solution131
1010Decrypt String from Alphabet to Integer Mapping Leetcode Solution130
1011Unique Paths II130
1012Maximum Length of Repeated Subarray130
1013Shortest Completing Word Leetcode Solution130
1014Insertion in a Binary Tree130
1015Find number of pairs in an array such that their XOR is 0130
1016Super Ugly Number130
1017The Painter’s Partition Problem130
1018Serialize and Deserialize Binary Tree130
1019Level order traversal using two Queues130
1020Largest Number Leetcode Solution130
1021Graph Valid Tree LeetCode Solution130
1022Advantages of BST over Hash Table129
1023Count subarrays where second highest lie before highest129
1024Compute nCr % p129
1025Ugly Number II LeetCode Solution129
1026Valid Boomerang Leetcode Solution129
1027Binary Search Tree129
1028K Closest Points to Origin Leetcode Solution129
1029Friends Of Appropriate Ages LeetCode Solution129
1030Number Of Longest Increasing Subsequence129
1031Collect maximum points in a grid using two traversals129
1032Design Hit Counter LeetCode Solution129
1033Ugly Numbers128
1034Construct Binary Tree from given Parent Array representation128
1035Scramble String LeetCode Solution128
1036Build an Array With Stack Operations Leetcode Solution128
1037Balanced Binary Tree128
1038Number of palindromic paths in a matrix128
1039Boolean Parenthesization Problem128
1040Defanging an IP Address LeetCode Solution128
1041Rearrange an array such that ‘arr[j]’ becomes ‘i’ if ‘arr[i]’ is ‘j’128
1042Minimum Size Subarray Sum128
1043Invalid Transactions LeetCode Solution128
1044Maximum Product of Indexes of Next Greater on Left and Right128
1045Next Greater Element III LeetCode Solution128
1046Construction of Longest Increasing Subsequence (N log N)128
1047Employee Importance LeetCode Solution128
1048Available Captures for Rook Leetcode Solution128
1049String Matching in an Array Leetcode Solution128
1050Longest Bitonic Subsequence127
1051Maximum Sum of 3 Non-Overlapping Subarrays127
1052Regular Expression Matching Regular Expression Matching LeetCode Solution127
1053Minimum Index Sum of Two Lists127
1054Find Peak Element127
1055Maximum length subsequence with difference between adjacent elements as either 0 or 1127
1056Find whether a subarray is in form of a mountain or not127
1057Morris Inorder Traversal127
1058Implement Trie (Prefix Tree) Leetcode Solution127
1059Populating Next Right Pointers in Each Node Leetcode Solution127
1060Maximum difference between frequency of two elements such that element having greater frequency is also greater127
1061Count minimum steps to get the given desired array127
1062Maximum weight transformation of a given string127
1063Kth Smallest Element in a Sorted Matrix LeetCode Solution127
1064Add two numbers127
1065Move all negative elements to end in order with extra space allowed126
1066Find the minimum distance between two numbers126
1067Iterative Depth First Traversal of Graph126
1068Find a Peak Element II LeetCode Solution126
1069Custom Sort String Leetcode Solution126
1070Lowest Common Ancestor126
1071Recover Binary Search Tree Leetcode Solution126
1072Validate Binary Search Tree126
1073Bitwise AND of Numbers Range LeetCode Solution126
1074Day of the Year Leetcode Solution125
1075Binary Tree Data Structure125
1076Number of Closed Islands Leetcode Solution125
1077Maximize Distance to Closest Person LeetCode Solution125
1078Search in Sorted Rotated Array125
1079Remove Duplicates from Sorted Array II Leetcode Solution125
1080Path Sum II LeetCode Solution125
1081Determine Whether Matrix Can Be Obtained By Rotation LeetCode Solution125
1082Combination Sum IV LeetCode Solution125
1083Smallest Common Region Leetcode Solution125
1084Largest BST Subtree LeetCode Solution125
1085Binary Tree Right Side View LeetCode Solution125
1086Divisible Pairs Counting125
1087Number of Students Doing Homework at a Given Time Leetcode Solution124
1088Clone a Binary Tree with Random Pointers124
1089Rearrange array such that even index elements are smaller and odd index elements are greater124
1090Remove Palindromic Subsequences Leetcode Solution124
1091Subarrays with K Different Integers Leetcode Solution124
1092Consecutive Characters LeetCode Solution124
1093Path Sum124
1094Next Permutation Leetcode Solution124
1095Types of Binary Tree124
1096Increasing Triplet Subsequence LeetCode Solution124
1097Kth Smallest Product of Two Sorted Arrays LeetCode Solution123
1098Print all triplets in sorted array that form AP123
1099Level of Each node in a Tree from source node123
1100Number of siblings of a given Node in n-ary Tree123
1101Count pairs from two sorted arrays whose sum is equal to a given value x123
1102Print Next Greater Number of Q queries123
1103Topological Sorting123
1104Generate Parentheses Leetcode Solution123
1105Serialize and Deserialize Binary Tree LeetCode Solution123
1106Find Smallest Range Containing Elements from k Lists123
1107Bottom View of a Binary Tree122
1108Root to Leaf path with target sum Leetcode Solutions122
1109Remove duplicates from sorted array122
1110Find maximum difference between nearest left and right smaller elements122
1111Maximum Product Subarray122
1112Distinct Subsequences122
1113Constant time range add operation on an array122
1114Maximum Binary Tree121
1115Valid Tic-Tac-Toe State LeetCode Solution121
1116Cutting a Rod121
1117Count Largest Group Leetcode Solution121
1118Construct Binary Tree from Preorder and Postorder Traversal LeetCode Solution121
1119Convert BST into a Min-Heap without using array121
1120Minimum Score Triangulation of Polygon Leetcode Solution121
1121Find Three Element From Different Three Arrays Such That a + b + c = sum121
1122Third Maximum Number Leetcode Solution121
1123Write Code to Determine if Two Trees are Identical121
1124Print Right View of a Binary Tree121
1125Reformat The String Leetcode Solution120
1126Products of ranges in an array120
1127Mean of Array After Removing Some Elements Leetcode Solution120
1128Golomb sequence120
1129Longest Subarray of 1’s After Deleting One Element LeetCode Solution120
1130Search an Element in Sorted Rotated Array120
1131Search Insert Position120
1132Iterative method to find ancestors of a given binary tree120
1133Palindrome Permutation LeetCode Solution120
1134Minimum sum of squares of character counts in a given string after removing k characters120
1135Cells with Odd Values in a Matrix LeetCode Solution120
1136Queries for Number of Distinct Elements in a Subarray120
1137Longest Increasing Consecutive Subsequence119
1138Prime Palindrome LeetCode Solution119
1139Find a sorted subsequence of size 3 in linear time119
1140Construct K Palindrome Strings LeetCode Solution119
1141Moser-de Bruijn Sequence119
1142Red-Black Tree Introduction119
1143Print modified array after executing the commands of addition and subtraction119
1144Thousand Separator Leetcode Solution119
1145Minimum Absolute Difference in BST Leetcode Solution119
1146Sum of Even Numbers After Queries119
1147Delete Nodes and Return Forest Leetcode Solution118
1148Bus Routes Leetcode Solution118
1149Binary Tree to Binary Search Tree Conversion118
1150Transform a BST to Greater sum Tree118
1151Find maximum length Snake sequence118
1152Factorial Trailing Zeroes LeetCode Solution117
1153Swap Nodes In Pairs117
1154Count even length binary sequences with same sum of first and second half bits117
1155K maximum sums of overlapping contiguous sub-arrays117
1156Kth Smallest Number in Multiplication Table Leetcode Solution117
1157Decision Tree117
1158Merge two BSTs with limited extra space117
1159Check Array Formation Through Concatenation Leetcode Solution117
1160Number of Orders in the Backlog Leetcode Solution117
1161Find the smallest binary digit multiple of given number117
1162Possible Bipartition LeetCode Solution117
1163Maximum Product of Splitted Binary Tree LeetCode Solution117
1164Longest Repeated Subsequence117
1165Find Two Non-overlapping Sub-arrays Each With Target Sum LeetCode Solution117
1166Palindromic Substrings Leetcode Solution117
1167Closest Binary Search Tree Value Leetcode Solution116
1168Rotate Array116
1169K’th Largest element in BST using constant extra space116
1170Swapping Nodes in a Linked List Leetcode Solution116
1171Compare Strings by Frequency of the Smallest Character Leetcode Solution116
1172Minimum Cost to Move Chips to The Same Position LeetCode Solution116
1173Maximize sum of consecutive differences in a circular array116
1174Subset Sum Problem in O(sum) space116
1175Priority Queue116
1176Minimum Sideway Jumps LeetCode Solution116
1177Web Crawler LeetCode Solution116
1178Find Largest Value in Each Tree Row LeetCode Solution115
1179Search Suggestions System LeetCode Solution115
1180Minimum Moves to Equal Array Elements LeetCode Solution115
1181First Bad Version115
1182Remove Max Number of Edges to Keep Graph Fully Traversable Leetcode Solution114
1183Decrease Elements To Make Array Zigzag LeetCode Solution114
1184Given a binary tree, how do you remove all the half nodes?114
1185Count Pairs Whose Products Exist in Array114
1186Closest Leaf in a Binary Tree LeetCode Solution114
1187Diameter of N-Ary Tree LeetCode Solution114
1188Queue Reconstruction by Height113
1189Convert Sorted Array to Binary Search Tree LeetCode Solutions113
1190Maximum number of segments of lengths a, b and c113
1191Contiguous Array LeetCode Solution113
1192Reverse a Path in BST using Queue113
1193Matchsticks to Square Leetcode Solution113
1194Moving Stones Until Consecutive Leetcode Solution113
1195Reformat Date LeetCode Solution112
1196Valid Triangle Number112
1197Filter Restaurants by Vegan-Friendly, Price and Distance Leetcode Solution112
1198Sum of Left Leaves LeetCode Solution112
1199Array Queries for multiply replacements and product112
1200Champagne Tower LeetCode Solution112
1201Maximum sum bitonic subarray112
1202Maximum Depth Of Binary Tree112
1203Kth Smallest Element in a BST112
1204Write a function to get the intersection point of two Linked Lists112
1205Lowest Common Ancestor in Binary Search Tree112
1206Maximum sum of pairs with specific difference111
1207How to print maximum number of A’s using given four keys111
1208Range Sum Query using Sparse Table111
1209Replace two consecutive equal values with one greater111
1210New 21 Game111
1211Concatenation of Array LeetCode Solution110
1212Divide Two Integers Leetcode Solution110
1213Valid Perfect Square LeetCode Solution110
1214Integer Break LeetCode Solution110
1215Range Queries for Longest Correct Bracket Subsequence110
1216Graph and its representation110
1217Guess The Word110
1218Maximum Value at a Given Index in a Bounded Array LeetCode Solution110
1219Convert Integer to the Sum of Two No-Zero Integers Leetcode Solution110
1220Design Skiplist LeetCode Solution110
1221Merge Sort109
1222Maximum sum of a path in a Right Number Triangle109
1223Symmetric Tree LeetCode Solution Leetcode Solution109
1224The kth Factor of n Leetcode Solution109
1225Check if each internal node of a BST has exactly one child109
1226BST to a Tree with Sum of all Smaller Keys109
1227Path Crossing Leetcode Solution109
1228Perfect Squares LeetCode Solution109
1229Lowest Common Ancestor of a Binary Tree Leetcode Solution109
1230Arithmetic Slices II – Subsequence LeetCode Solution109
1231Flatten 2D Vector LeetCode Solution109
1232Print modified array after multiple array range increment operations109
1233Check for Identical BSTs without building the trees109
1234Check Completeness of a Binary Tree LeetCode Solution109
1235Count Subsets Having Distinct Even Numbers108
1236Parallel Courses II LeetCode Solution108
1237Minimum Swaps To Make Sequences Increasing LeetCode Solution108
1238Check if all levels of two Binary Tree are anagrams or not108
1239Longest Common Prefix Using Word by Word Matching108
1240Sliding Window Median Leetcode Solution108
1241Queries on Probability of Even or Odd Number in given Ranges108
1242Maximum Array from Two given Arrays Keeping Order Same107
1243Mean of range in array107
1244Largest Plus Sign Leetcode Solution107
1245Count and Toggle Queries on a Binary Array107
1246Contiguous Array107
1247Maximize Elements Using Another Array107
1248Find Minimum in Rotated Sorted Array II LeetCode Solution107
1249Missing Number107
1250Graph Cloning107
1251Power of Two107
1252Image Overlap LeetCode Solution107
1253LRU Cache Leetcode Solution106
1254Check If a String Can Break Another String Leetcode Solution106
1255Bold Words in String LeetCode Solution106
1256Print n terms of Newman-Conway Sequence106
1257Find minimum number of merge operations to make an array palindrome106
1258Minimum Remove to Make Valid Parentheses LeetCode Solution105
1259Excel Sheet Column Title LeetCode Solution105
1260Find k-th smallest element in BST (Order Statistics in BST)105
1261Verify Preorder Serialization of a Binary Tree105
1262Print Ancestors of a Given Binary Tree Node Without Recursion104
1263Next greater element104
1264Merge k Sorted Lists Leetcode Solution104
1265Maximum Product Subarray104
1266Minimum Time to Collect All Apples in a Tree LeetCode Solution103
1267Smallest Range II Leetcode Solution103
1268Palindrome Partitioning103
1269Min Cost Climbing Stairs LeetCode Solution102
1270Check if two nodes are on the same path in a Tree102
1271Orderly Queue LeetCode Solution101
1272Check in binary array the number represented by a subarray is odd or even101
1273Merge Sorted Array101
1274Koko Eating Bananas LeetCode Solution100
1275Peeking Iterator LeetCode Solution99
1276Different Ways to Add Parentheses Leetcode Solution99
1277Newman–Shanks–Williams prime99
1278Number of elements less than or equal to a given number in a given subarray99
1279Check if X can give change to every person in the Queue99
1280Maximum Sum Increasing Subsequence97
1281Find maximum average subarray of k length97
1282Range Minimum Query (Square Root Decomposition and Sparse Table)97
1283Largest Submatrix With Rearrangements LeetCode Solution97
1284Queries for Decimal Values of Subarrays of a Binary Array96
1285Number of indexes with equal elements in given range96
1286Minimum Total Space Wasted With K Resizing Operations LeetCode Solution95
1287Longest Substring Without Repeating Characters Leetcode Solution95
1288Maximum product of an increasing subsequence95
1289Array Nesting Leetcode Solution95
1290Binary Tree to Binary Search Tree Conversion using STL set94
1291Check given array of size n can represent BST of n levels or not94
1292Arranging Coins Leetcode Solution93
1293Jump Game IV LeetCode Solution92
1294Random Pick Index LeetCode Solution92
1295Minimum Number of People to Teach LeetCode Solution92
1296Encoded String With Shortest Length LeetCode Solution92
1297Reach a Number LeetCode Solution92
1298Convert to Base -2 LeetCode Solution92
1299Convert a BST to a Binary Tree such that sum of all greater keys is added to every key91
1300Queries on XOR of greatest odd divisor of the range91
1301Find the Winner of the Circular Game LeetCode Solution91
1302Minimum Possible Integer After at Most K Adjacent Swaps On Digits LeetCode Solution90
1303Insert Delete GetRandom O(1) Leetcode Solution90
1304Palindrome Number LeetCode Solution88
1305Number of Subsequences That Satisfy the Given Sum Condition LeetCode solution88
1306Add Two Numbers II Leetcode Solution87
1307Vertical Order Traversal of Binary Tree LeetCode Solution87
1308Design Underground System Leetcode Solution86
1309Continuous Subarray Sum LeetCode Solution85
1310Print Maximum Length Chain of Pairs84
1311Detect Capital Leetcode Solution81
1312Design A Leaderboard Leetcode Solution79
1313Top K Frequent Elements LeetCode Solution77
1314Minimum Swaps to Group All 1’s Together Leetcode Solution77
1315Substring with Concatenation of All Words Leetcode Solution77
1316Decode String Leetcode Solution73
1317Minimum Path Sum Leetcode Solution73
1318Count Sub Islands LeetCode Solution72
1319Binary Tree Inorder Traversal LeetCode Solution72
1320Odd Even Linked List Leetcode Solution72
1321Shortest Unsorted Continuous Subarray LeetCode Solution71
1322Shifting Letters LeetCode Solution71
1323Maximum Population Year LeetCode Solution70
1324Find the Town Judge LeetCode Solution70
1325Sum Root to Leaf Numbers LeetCode Solution70
1326Best Meeting Point LeetCode Solution69
1327Longest Common Subsequence LeetCode Solution68
1328Find the Town Judge LeetCode Solution68
1329Design Add and Search Words Data Structure LeetCode Solution66
1330Rectangle Overlap LeetCode Solution65
1331Score of Parenthesis LeetCode Solution64
1332Maximum Population Year LeetCode Solution64
1333Insert into a Sorted Circular Linked List LeetCode Solution62
1334Stone Game IV LeetCode Solution62
1335Flatten Binary Tree to Linked List LeetCode Solution61
1336Range Sum Query 2D – Immutable LeetCode Solution60
1337Valid Triangle Number LeetCode Solution59
1338Is Graph Bipartite? LeetCode Solution57
1339Reveal Cards In Increasing Order Leetcode Solution54
1340Divide Chocolate LeetCode Solution50
1341Step-By-Step Directions From a Binary Tree Node to Another LeetCode Solution42
1342Range Sum of BST LeetCode Solution42
1343Reverse Integer Leetcode Solution40
1344Sort Colors LeetCode Solution37
1345Find K Closest Elements LeetCode Solution34
1346Excel Sheet Column Number LeetCode Solution33
1347Rotate String LeetCode Solution32
1348Maximum Side Length of a Square with Sum Less than or Equal to Threshold LeetCode Solution30
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