Practice problems across 75+ categories
Practice problems frequently asked at Matrix • 260 problems | 38 Easy | 152 Medium | 68 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 196 | Queens That Can Attack the King | Medium | ArrayMatrixSimulation |
| 197 | Range Sum Query 2D - Immutable | Medium | ArrayDesignMatrix |
| 198 | Range Sum Query 2D - Mutable | Medium | ArrayDesignBinary Indexed Tree |
| 199 | Rank Transform of a Matrix | Hard | ArrayUnion FindGraph |
| 200 | Reconstruct a 2-Row Binary Matrix | Medium | ArrayGreedyMatrix |
| 201 | Regions Cut By Slashes | Medium | ArrayHash TableDepth-First Search |
| 202 | Remove All Ones With Row and Column Flips | Medium | ArrayMathBit Manipulation |
| 203 | Remove All Ones With Row and Column Flips II | Medium | ArrayBit ManipulationBreadth-First Search |
| 204 | Reshape the Matrix | Easy | ArrayMatrixSimulation |
| 205 | Richest Customer Wealth | Easy | ArrayMatrix |
| 206 | Rotate Image | Medium | ArrayMathMatrix |
| 207 | Rotating the Box | Medium | ArrayTwo PointersMatrix |
| 208 | Rotting Oranges | Medium | ArrayBreadth-First SearchMatrix |
| 209 | Row With Maximum Ones | Easy | ArrayMatrix |
| 210 | Score After Flipping Matrix | Medium | ArrayGreedyBit Manipulation |
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