DSA
Master the patterns
Search the bank, then filter by difficulty, pattern, data structure, or algorithm. Each problem includes approaches, solutions, and walkthroughs.
Active·2,723
Easy·667
Medium·1,394
Hard·662
Patterns
Recognize the move
Filter the bank by pattern — each card links into the problem index.
Problem index
Browse problems
Search by title, then refine with facets. Sorted by problem ID.
Difficulty
Facets
20 of 58 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0001Two SumEasy
- 0002Add Two NumbersMed
- 0005Longest Palindromic SubstringMed
- 0011Container With Most WaterMed
- 00153SumMed
- 0023Merge k Sorted ListsHard
- 0024Swap Nodes in PairsMed
- 0025Reverse Nodes in k-GroupHard
- 0033Search in Rotated Sorted ArrayMed
- 0041First Missing PositiveHard
- 0042Trapping Rain WaterHard
- 0045Jump Game IIMed
- 0049Group AnagramsMed
- 0054Spiral MatrixMed
- 0056Merge IntervalsMed
- 0065Valid NumberHard
- 0073Set Matrix ZeroesMed
- 0074Search a 2D MatrixMed
- 0092Reverse Linked List IIMed
- 0103Binary Tree Zigzag Level Order TraversalMed
Showing 20 of 58