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 217 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0029Divide Two IntegersMed
- 0067Add BinaryEasy
- 0078SubsetsMed
- 0089Gray CodeMed
- 0090Subsets IIMed
- 0136Single NumberEasy
- 0137Single Number IIMed
- 0177Repeated DNA SequencesMed
- 0180Reverse BitsEasy
- 0181Number of 1 BitsEasy
- 0189Bitwise AND of Numbers RangeMed
- 0210Count Complete Tree NodesEasy
- 0219Power of TwoEasy
- 0248Single Number IIIMed
- 0255Missing NumberEasy
- 0274Find the Duplicate NumberMed
- 0305Maximum Product of Word LengthsMed
- 0325Counting BitsEasy
- 0329Power of FourEasy
- 0358Sum of Two IntegersMed
Showing 20 of 217