Practice problems across 75+ categories
Practice problems frequently asked at Matrix • 260 problems | 38 Easy | 152 Medium | 68 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 16 | Check if There Is a Valid Parentheses String Path | Hard | ArrayDynamic ProgrammingMatrix |
| 17 | Check if There is a Valid Path in a Grid | Medium | ArrayDepth-First SearchBreadth-First Search |
| 18 | Check if Word Can Be Placed In Crossword | Medium | ArrayMatrixEnumeration |
| 19 | Check Knight Tour Configuration | Medium | ArrayDepth-First SearchBreadth-First Search |
| 20 | Cherry Pickup | Hard | ArrayDynamic ProgrammingMatrix |
| 21 | Cherry Pickup II | Hard | ArrayDynamic ProgrammingMatrix |
| 22 | Coloring A Border | Medium | ArrayDepth-First SearchBreadth-First Search |
| 23 | Construct 2D Grid Matching Graph Layout | Hard | ArrayHash TableGraph |
| 24 | Construct Product Matrix | Medium | ArrayMatrixPrefix Sum |
| 25 | Construct Quad Tree | Medium | ArrayDivide and ConquerTree |
| 26 | Contain Virus | Hard | ArrayDepth-First SearchBreadth-First Search |
| 27 | Convert 1D Array Into 2D Array | Easy | ArrayMatrixSimulation |
| 28 | Count Cells in Overlapping Horizontal and Vertical Substrings | Medium | ArrayStringRolling Hash |
| 29 | Count Fertile Pyramids in a Land | Hard | ArrayDynamic ProgrammingMatrix |
| 30 | Count Negative Numbers in a Sorted Matrix | Easy | ArrayBinary SearchMatrix |
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