Practice problems across 75+ categories
Practice problems frequently asked at Matrix • 260 problems | 38 Easy | 152 Medium | 68 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 241 | The K Weakest Rows in a Matrix | Easy | ArrayBinary SearchSorting |
| 242 | The Knight's Tour | Medium | ArrayBacktrackingMatrix |
| 243 | The Maze | Medium | ArrayDepth-First SearchBreadth-First Search |
| 244 | The Maze II | Medium | ArrayDepth-First SearchBreadth-First Search |
| 245 | The Maze III | Hard | ArrayStringDepth-First Search |
| 246 | Toeplitz Matrix | Easy | ArrayMatrix |
| 247 | Transform to Chessboard | Hard | ArrayMathBit Manipulation |
| 248 | Transpose Matrix | Easy | ArrayMatrixSimulation |
| 249 | Trapping Rain Water II | Hard | ArrayBreadth-First SearchHeap (Priority Queue) |
| 250 | Unique Paths III | Hard | ArrayBacktrackingBit Manipulation |
| 251 | Valid Sudoku | Medium | ArrayHash TableMatrix |
| 252 | Valid Tic-Tac-Toe State | Medium | ArrayMatrix |
| 253 | Valid Word Square | Easy | ArrayMatrix |
| 254 | Walls and Gates | Medium | ArrayBreadth-First SearchMatrix |
| 255 | Where Will the Ball Fall | Medium | ArrayMatrixSimulation |
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