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 65 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0001Two SumEasy
- 0003Longest Substring Without Repeating CharactersMed
- 0011Container With Most WaterMed
- 0012Integer to RomanMed
- 00153SumMed
- 0034Find First and Last Position of Element in Sorted ArrayMed
- 0042Trapping Rain WaterHard
- 0045Jump Game IIMed
- 0049Group AnagramsMed
- 0053Maximum SubarrayMed
- 0056Merge IntervalsMed
- 0063Unique Paths IIMed
- 0068Text JustificationHard
- 0079Word SearchMed
- 0088Merge Sorted ArrayEasy
- 0121Best Time to Buy and Sell StockEasy
- 0128Longest Consecutive SequenceMed
- 0199Design Add and Search Words Data StructureMed
- 0217Majority Element IIMed
- 0221Number of Digit OneHard
Showing 20 of 65