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 69 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0128Longest Consecutive SequenceMed
- 0130Surrounded RegionsMed
- 0188Number of IslandsMed
- 0386Evaluate DivisionMed
- 0531Number of ProvincesMed
- 0638Redundant ConnectionMed
- 0639Redundant Connection IIHard
- 0649Max Area of IslandMed
- 0675Accounts MergeMed
- 0719Couples Holding HandsHard
- 0732Swim in Rising WaterHard
- 0739Is Graph Bipartite?Med
- 0757Bricks Falling When HitHard
- 0781Making A Large IslandHard
- 0793Similar String GroupsHard
- 0840Possible BipartitionMed
- 0878Minimize Malware SpreadHard
- 0882Minimize Malware Spread IIHard
- 0901Most Stones Removed with Same Row or ColumnMed
- 0906Largest Component Size by Common FactorHard
Showing 20 of 69