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 93 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0001Two SumEasy
- 0003Longest Substring Without Repeating CharactersMed
- 0004Median of Two Sorted ArraysHard
- 0006Zigzag ConversionMed
- 0011Container With Most WaterMed
- 00153SumMed
- 0020Valid ParenthesesEasy
- 0033Search in Rotated Sorted ArrayMed
- 0034Find First and Last Position of Element in Sorted ArrayMed
- 0036Valid SudokuMed
- 0038Count and SayMed
- 0041First Missing PositiveHard
- 0042Trapping Rain WaterHard
- 0045Jump Game IIMed
- 0048Rotate ImageMed
- 0049Group AnagramsMed
- 0053Maximum SubarrayMed
- 0054Spiral MatrixMed
- 0055Jump GameMed
- 0056Merge IntervalsMed
Showing 20 of 93