Practice problems across 75+ categories
Practice problems frequently asked at Matrix • 260 problems | 38 Easy | 152 Medium | 68 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 226 | Sort the Students by Their Kth Score | Medium | ArraySortingMatrix |
| 227 | Sparse Matrix Multiplication | Medium | ArrayHash TableMatrix |
| 228 | Special Positions in a Binary Matrix | Easy | ArrayMatrix |
| 229 | Spiral Matrix | Medium | ArrayMatrixSimulation |
| 230 | Spiral Matrix II | Medium | ArrayMatrixSimulation |
| 231 | Spiral Matrix III | Medium | ArrayMatrixSimulation |
| 232 | Spiral Matrix IV | Medium | ArrayLinked ListMatrix |
| 233 | Stamping the Grid | Hard | ArrayGreedyMatrix |
| 234 | Strange Printer II | Hard | ArrayGraphTopological Sort |
| 235 | Subrectangle Queries | Medium | ArrayDesignMatrix |
| 236 | Sudoku Solver | Hard | ArrayHash TableBacktracking |
| 237 | Sum in a Matrix | Medium | ArraySortingHeap (Priority Queue) |
| 238 | Sum of Remoteness of All Cells | Medium | ArrayHash TableDepth-First Search |
| 239 | Surface Area of 3D Shapes | Easy | ArrayMathGeometry |
| 240 | Surrounded Regions | Medium | ArrayDepth-First SearchBreadth-First Search |
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