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 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 % 0 464 Sum of distinct elements among two given sets Beginner % 0 463 Combinations with sum K from a given number N with repetition Medium % 0 461 Insert a node in the given sorted linked list. Beginner % 1 458 Print sorted unique elements of a given array Beginner % 0 457 Given an array, print all unique subsets with a given sum. Medium % 0 456 Subsets Elements less than K. Medium % 0 455 Replace array elements with maximum element on the right. Medium % 0 454 Find all unique combinations of numbers (from 1 to 9 ) with sum to N Medium % 0 447 Check If Given Undirected Graph is a tree Medium % 0 446 Print all middle elements of the given matrix/2D array. Beginner % 1 445 Depth-First Search (DFS) in 2D Matrix/2D-Array - Recursive Solution Beginner % 1 443 Check the completeness of given binary tree | Set 2 - Using Level Order Traversal Medium % 0 442 Find the number of distinct Islands OR connected components. Hard % 0 441 Print All Paths in Dijkstra's Shortest Path Algorithm Hard % 0 440 Given an array, Print sum of all subsets Beginner % 1 437 Lexicographically previous permutation With One swap Medium % 1 436 Find all unique combinations of exact K numbers (from 1 to 9 ) with sum to N Medium % 0 434 Print boundary of given matrix/2D array. Beginner % 1 433 Depth-First Search (DFS) in 2D Matrix/2D-Array - Iterative Solution Beginner % 0 432 Breadth-First Search (BFS) in 2D Matrix/2D-Array Beginner % 1 430 Longest substring with at most K unique characters Medium % 2 427 Number of Islands using BFS Medium % 0 422 Print Stack in reverse order Beginner % 0 420 Number's Complement - 2 Approaches Medium % 1 419 Print all subsets of an array with a sum equal to zero Medium % 0 415 Hamming Distance between two given strings Beginner % 0 408 Number of Islands Medium % 1 397 Find Third Smallest elements in a given array Beginner % 0 396 Optimizing Test Execution: Managing Test Dependencies for Sequential Order Medium % 0 394 Find the maximum number present in a String Beginner % 0 393 Count number of subgraphs in a given graph Beginner % 0 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. Sum of distinct elements among two given sets Combinations with sum K from a given number N with repetition Insert a node in the given sorted linked list. Print sorted unique elements of a given array Given an array, print all unique subsets with a given sum. Subsets Elements less than K. Replace array elements with maximum element on the right. Find all unique combinations of numbers (from 1 to 9 ) with sum to N Check If Given Undirected Graph is a tree Print all middle elements of the given matrix/2D array. Depth-First Search (DFS) in 2D Matrix/2D-Array - Recursive Solution Check the completeness of given binary tree | Set 2 - Using Level Order Traversal Find the number of distinct Islands OR connected components. Print All Paths in Dijkstra's Shortest Path Algorithm Given an array, Print sum of all subsets Lexicographically previous permutation With One swap Find all unique combinations of exact K numbers (from 1 to 9 ) with sum to N Print boundary of given matrix/2D array. Depth-First Search (DFS) in 2D Matrix/2D-Array - Iterative Solution Breadth-First Search (BFS) in 2D Matrix/2D-Array Longest substring with at most K unique characters Number of Islands using BFS Print Stack in reverse order Number's Complement - 2 Approaches Print all subsets of an array with a sum equal to zero Hamming Distance between two given strings Number of Islands Find Third Smallest elements in a given array Optimizing Test Execution: Managing Test Dependencies for Sequential Order Find the maximum number present in a String Count number of subgraphs in a given graph 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16