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
11 of 11 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0014Longest Common PrefixEasy
- 0042Trapping Rain WaterHard
- 0386Evaluate DivisionMed
- 0402Add StringsEasy
- 0828Walking Robot SimulationMed
- 0986Stream of CharactersHard
- 1647Number of Orders in the BacklogMed
- 1897Count Common Words With One OccurrenceEasy
- 2036Add Two IntegersEasy
- 2093Design a Text EditorHard
- 2513Minimum Time to Make Array Sum At Most xHard
All 11 matching problems loaded