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 99 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0001Two SumEasy
- 0003Longest Substring Without Repeating CharactersMed
- 0004Median of Two Sorted ArraysHard
- 0011Container With Most WaterMed
- 00153SumMed
- 0021Merge Two Sorted ListsEasy
- 0026Remove Duplicates from Sorted ArrayEasy
- 0033Search in Rotated Sorted ArrayMed
- 0041First Missing PositiveHard
- 0042Trapping Rain WaterHard
- 0045Jump Game IIMed
- 0055Jump GameMed
- 0056Merge IntervalsMed
- 0063Unique Paths IIMed
- 0072Edit DistanceMed
- 0075Sort ColorsMed
- 0084Largest Rectangle in HistogramHard
- 0085Maximal RectangleHard
- 0091Decode WaysMed
- 0100Same TreeEasy
Showing 20 of 99