Featured Lists Top 20 Problems on Dynamic programming Top 10 Problems on Backtracking Top 20 Problems on Graph Top 25 Problems on Trees Top 10 Problems on Bits Manipulation Top 15 Problems in LinkedList All Problems # Status Problem video Level Completes Likes 37 Get the Height of a Node in a Binary Tree Medium % 0 33 Reverse the binary representation of a number. Medium % 1 30 Swap Every Kth Node in a LinkedList Medium % 0 26 Check if one string is Rotation of another string Beginner % 1 23 Find Whether Two Strings are Permutation of each other Beginner % 1 18 All Paths from Top Left to Bottom Right in 2D Array Medium % 0 17 Merge or Combine Two Sorted Linked Lists Medium % 0 15 Efficiently Rearrange Positive and Negative Numbers in Array on Each Side Hard % 0 7 Determine If a String is Palindrome Beginner % 0 4 Find a Missing Number From a Sequence of Consecutive Numbers Beginner % 0 532 Maximum Depth of Valid Nested Parentheses in an arithmetic expression Medium % 0 526 Maximum Surpasser in the given array Hard % 0 524 Maximum CPU Load Problem in a jobs list Medium % 1 521 Maximum overlaps in a given list of time intervals Medium % 0 512 Override the compare function for Collections.sort method Beginner % 0 510 Design a data structure for Candidate Voting Problem Medium % 0 507 Design data structure for players and ranks Medium % 0 505 Override the compare function for Arrays.sort method - Java Beginner % 0 502 Calculate tax on income as per given tax brackets. Beginner % 0 498 The largest number can be formed from the given number Beginner % 0 497 Minimum number of adjacent swaps to sort the given array Hard % 1 492 Find the number of pairs with even XOR Beginner % 0 489 The number of cycles in a given array of integers. Hard % 0 488 Check if given sudoku is valid or not Medium % 0 487 Find Election Winner Beginner % 0 486 Sort the indexes of the array as per the elements of the array Medium % 0 485 Construct the Largest number from the given digits Beginner % 1 483 Find Lexicographically smallest or largest substring of size k Beginner % 0 482 Largest word in dictionary by removing a few characters from the given string Beginner % 0 480 Check if one string is a subsequence of another string. Beginner % 0 479 Most frequent word Beginner % 0 478 Efficient Robot Problem - Find Minimum Trips Hard % 0 477 Job Sequencing algorithm Medium % 1 473 Given an array, count the number of pairs with a given sum. Beginner % 0 468 Unique subsets with a given sum with allowed repeated digits. Medium % 0 Get the Height of a Node in a Binary Tree Reverse the binary representation of a number. Swap Every Kth Node in a LinkedList Check if one string is Rotation of another string Find Whether Two Strings are Permutation of each other All Paths from Top Left to Bottom Right in 2D Array Merge or Combine Two Sorted Linked Lists Efficiently Rearrange Positive and Negative Numbers in Array on Each Side Determine If a String is Palindrome Find a Missing Number From a Sequence of Consecutive Numbers Maximum Depth of Valid Nested Parentheses in an arithmetic expression Maximum Surpasser in the given array Maximum CPU Load Problem in a jobs list Maximum overlaps in a given list of time intervals Override the compare function for Collections.sort method Design a data structure for Candidate Voting Problem Design data structure for players and ranks Override the compare function for Arrays.sort method - Java Calculate tax on income as per given tax brackets. The largest number can be formed from the given number Minimum number of adjacent swaps to sort the given array Find the number of pairs with even XOR The number of cycles in a given array of integers. Check if given sudoku is valid or not Find Election Winner Sort the indexes of the array as per the elements of the array Construct the Largest number from the given digits Find Lexicographically smallest or largest substring of size k Largest word in dictionary by removing a few characters from the given string Check if one string is a subsequence of another string. Most frequent word Efficient Robot Problem - Find Minimum Trips Job Sequencing algorithm Given an array, count the number of pairs with a given sum. Unique subsets with a given sum with allowed repeated digits. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16