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 261 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0004Median of Two Sorted ArraysHard
- 0033Search in Rotated Sorted ArrayMed
- 0034Find First and Last Position of Element in Sorted ArrayMed
- 0035Search Insert PositionEasy
- 0069Sqrt(x)Easy
- 0074Search a 2D MatrixMed
- 0081Search in Rotated Sorted Array IIMed
- 0153Find Minimum in Rotated Sorted ArrayMed
- 0154Find Minimum in Rotated Sorted Array IIHard
- 0162Find Peak ElementMed
- 0167Two Sum II - Input Array Is SortedMed
- 0197Minimum Size Subarray SumMed
- 0210Count Complete Tree NodesEasy
- 0228Search a 2D Matrix IIMed
- 0255Missing NumberEasy
- 0262H-Index IIMed
- 0265First Bad VersionEasy
- 0274Find the Duplicate NumberMed
- 0287Longest Increasing SubsequenceMed
- 0302Count of Smaller Numbers After SelfHard
Showing 20 of 261