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
9 of 9 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0003Longest Substring Without Repeating CharactersMed
- 0004Median of Two Sorted ArraysHard
- 0014Longest Common PrefixEasy
- 0025Reverse Nodes in k-GroupHard
- 0033Search in Rotated Sorted ArrayMed
- 0053Maximum SubarrayMed
- 0397Split Array Largest SumHard
- 2081Check if Number Has Equal Digit Count and Digit ValueEasy
- 2442Extra Characters in a StringMed
All 9 matching problems loaded