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 22 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 00153SumMed
- 0041First Missing PositiveHard
- 0045Jump Game IIMed
- 0053Maximum SubarrayMed
- 0062Unique PathsMed
- 0063Unique Paths IIMed
- 0084Largest Rectangle in HistogramHard
- 0167Two Sum II - Input Array Is SortedMed
- 0188Number of IslandsMed
- 0322Self CrossingHard
- 0390Frog JumpHard
- 0447LFU CacheHard
- 0695Cherry PickupHard
- 0844Find and Replace PatternMed
- 0863Snakes and LaddersMed
- 1954Count the Hidden SequencesMed
- 1956Number of Ways to Divide a Long CorridorHard
- 2246Total Cost to Hire K WorkersMed
- 2364Split the Array to Make Coprime ProductsHard
- 2388Shortest Cycle in a GraphHard
Showing 20 of 22