Practice problems across 75+ categories
Practice problems frequently asked at Matrix • 260 problems | 38 Easy | 152 Medium | 68 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 31 | Count Negative Numbers in a Sorted Matrix | Easy | ArrayBinary SearchMatrix |
| 32 | Count Paths With the Given XOR Value | Medium | ArrayDynamic ProgrammingBit Manipulation |
| 33 | Count Servers that Communicate | Medium | ArrayDepth-First SearchBreadth-First Search |
| 34 | Count Square Submatrices with All Ones | Medium | ArrayDynamic ProgrammingMatrix |
| 35 | Count Sub Islands | Medium | ArrayDepth-First SearchBreadth-First Search |
| 36 | Count Submatrices With All Ones | Medium | ArrayDynamic ProgrammingStack |
| 37 | Count Submatrices With Equal Frequency of X and Y | Medium | ArrayMatrixPrefix Sum |
| 38 | Count Submatrices with Top-Left Element and Sum Less Than k | Medium | ArrayMatrixPrefix Sum |
| 39 | Count Unguarded Cells in the Grid | Medium | ArrayMatrixSimulation |
| 40 | Cut Off Trees for Golf Event | Hard | ArrayBreadth-First SearchHeap (Priority Queue) |
| 41 | Cyclically Rotating a Grid | Medium | ArrayMatrixSimulation |
| 42 | Delete Greatest Value in Each Row | Easy | ArraySortingHeap (Priority Queue) |
| 43 | Design a 3D Binary Matrix with Efficient Layer Tracking | Medium | ArrayHash TableDesign |
| 44 | Design Excel Sum Formula | Unknown | ArrayHash TableString |
| 45 | Design Neighbor Sum Service | Easy | ArrayHash TableDesign |
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