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 54 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0042Trapping Rain WaterHard
- 0084Largest Rectangle in HistogramHard
- 0085Maximal RectangleHard
- 0303Remove Duplicate LettersMed
- 0308Create Maximum NumberHard
- 0389Remove K DigitsMed
- 0443132 PatternMed
- 0483Next Greater Element IEasy
- 0490Next Greater Element IIMed
- 0556Shortest Unsorted Continuous SubarrayMed
- 0608Maximum Binary TreeMed
- 0693Daily TemperaturesMed
- 0722Max Chunks To Make Sorted IIHard
- 0723Max Chunks To Make SortedMed
- 0807Car FleetMed
- 0855Online Stock SpanMed
- 0861Sum of Subarray MinimumsMed
- 0916Maximum Width RampMed
- 0929Odd Even JumpHard
- 0962Construct Binary Search Tree from Preorder TraversalMed
Showing 20 of 54