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 55 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0206The Skyline ProblemHard
- 0294Range Sum Query - MutableMed
- 0302Count of Smaller Numbers After SelfHard
- 0314Count of Range SumHard
- 0393Queue Reconstruction by HeightMed
- 0480Reverse PairsHard
- 0627Number of Longest Increasing SubsequenceMed
- 0653Falling SquaresHard
- 0669Range ModuleHard
- 0683My Calendar IMed
- 0685My Calendar IIMed
- 0686My Calendar IIIHard
- 0804Rectangle Area IIHard
- 1088Online Majority Element In SubarrayHard
- 1292Count Number of TeamsMed
- 1388Minimum Possible Integer After at Most K Adjacent Swaps On DigitsHard
- 1402Find a Value of a Mysterious Function Closest to TargetHard
- 1491Fancy SequenceHard
- 1514Create Sorted Array through InstructionsHard
- 1547Delivering Boxes from Storage to PortsHard
Showing 20 of 55