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 219 matching · 2723 totalSort: id ↑
No.ProblemDifficulty
- 0036Valid SudokuMed
- 0037Sudoku SolverHard
- 0048Rotate ImageMed
- 0054Spiral MatrixMed
- 0059Spiral Matrix IIMed
- 0063Unique Paths IIMed
- 0064Minimum Path SumMed
- 0073Set Matrix ZeroesMed
- 0074Search a 2D MatrixMed
- 0079Word SearchMed
- 0085Maximal RectangleHard
- 0130Surrounded RegionsMed
- 0174Dungeon GameHard
- 0188Number of IslandsMed
- 0200Word Search IIHard
- 0209Maximal SquareMed
- 0228Search a 2D Matrix IIMed
- 0276Game of LifeMed
- 0291Range Sum Query 2D - ImmutableMed
- 0316Longest Increasing Path in a MatrixHard
Showing 20 of 219