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 523 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0005Longest Palindromic SubstringMed
- 0010Regular Expression MatchingHard
- 0022Generate ParenthesesMed
- 0032Longest Valid ParenthesesHard
- 0042Trapping Rain WaterHard
- 0044Wildcard MatchingHard
- 0045Jump Game IIMed
- 0053Maximum SubarrayMed
- 0055Jump GameMed
- 0062Unique PathsMed
- 0063Unique Paths IIMed
- 0064Minimum Path SumMed
- 0070Climbing StairsEasy
- 0072Edit DistanceMed
- 0085Maximal RectangleHard
- 0087Scramble StringHard
- 0091Decode WaysMed
- 0095Unique Binary Search Trees IIMed
- 0096Unique Binary Search TreesMed
- 0097Interleaving StringMed
Showing 20 of 523