Practice problems across 75+ categories
Practice problems frequently asked at Matrix • 260 problems | 38 Easy | 152 Medium | 68 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 61 | Find a Safe Walk Through a Grid | Medium | ArrayBreadth-First SearchGraph |
| 62 | Find All Groups of Farmland | Medium | ArrayDepth-First SearchBreadth-First Search |
| 63 | Find Champion I | Easy | ArrayMatrix |
| 64 | Find Kth Largest XOR Coordinate Value | Medium | ArrayDivide and ConquerBit Manipulation |
| 65 | Find Minimum Time to Reach Last Room I | Medium | ArrayGraphHeap (Priority Queue) |
| 66 | Find Minimum Time to Reach Last Room II | Medium | ArrayGraphHeap (Priority Queue) |
| 67 | Find Missing and Repeated Values | Easy | ArrayHash TableMath |
| 68 | Find Smallest Common Element in All Rows | Medium | ArrayHash TableBinary Search |
| 69 | Find Sorted Submatrices With Maximum Element at Most K | Hard | ArrayStackMatrix |
| 70 | Find the Grid of Region Average | Medium | ArrayMatrix |
| 71 | Find the Kth Smallest Sum of a Matrix With Sorted Rows | Hard | ArrayBinary SearchHeap (Priority Queue) |
| 72 | Find the Maximum Number of Fruits Collected | Hard | ArrayDynamic ProgrammingMatrix |
| 73 | Find the Minimum Area to Cover All Ones I | Medium | ArrayMatrix |
| 74 | Find the Minimum Area to Cover All Ones II | Hard | ArrayMatrixEnumeration |
| 75 | Find the Safest Path in a Grid | Medium | ArrayBinary SearchBreadth-First Search |
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