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 397 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 00153SumMed
- 00163Sum ClosestMed
- 00184SumMed
- 0047Permutations IIMed
- 0049Group AnagramsMed
- 0056Merge IntervalsMed
- 0075Sort ColorsMed
- 0088Merge Sorted ArrayEasy
- 0147Insertion Sort ListMed
- 0148Sort ListMed
- 0164Maximum GapMed
- 0169Majority ElementEasy
- 0175Largest NumberMed
- 0203Kth Largest Element in an ArrayMed
- 0205Contains DuplicateEasy
- 0208Contains Duplicate IIIHard
- 0217Majority Element IIMed
- 0230Valid AnagramEasy
- 0255Missing NumberEasy
- 0261H-IndexMed
Showing 20 of 397