Practice problems across 75+ categories
Practice problems frequently asked at Matrix • 260 problems | 38 Easy | 152 Medium | 68 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 136 | Maximum Sum of an Hourglass | Medium | ArrayMatrixPrefix Sum |
| 137 | Maximum Sum With at Most K Elements | Medium | ArrayGreedySorting |
| 138 | Maximum Trailing Zeros in a Cornered Path | Medium | ArrayMatrixPrefix Sum |
| 139 | Maximum Vacation Days | Hard | ArrayDynamic ProgrammingMatrix |
| 140 | Maximum Value Sum by Placing Three Rooks I | Hard | ArrayDynamic ProgrammingMatrix |
| 141 | Maximum Value Sum by Placing Three Rooks II | Hard | ArrayDynamic ProgrammingMatrix |
| 142 | Median of a Row Wise Sorted Matrix | Unknown | ArrayBinary SearchMatrix |
| 143 | Minesweeper | Medium | ArrayDepth-First SearchBreadth-First Search |
| 144 | Minimize Maximum Value in a Grid | Hard | ArrayUnion FindGraph |
| 145 | Minimize the Difference Between Target and Chosen Elements | Medium | ArrayDynamic ProgrammingMatrix |
| 146 | Minimum Absolute Difference in Sliding Submatrix | Medium | ArraySortingMatrix |
| 147 | Minimum Cost to Connect Two Groups of Points | Hard | ArrayDynamic ProgrammingBit Manipulation |
| 148 | Minimum Cost to Make at Least One Valid Path in a Grid | Hard | ArrayBreadth-First SearchGraph |
| 149 | Minimum Falling Path Sum | Medium | ArrayDynamic ProgrammingMatrix |
| 150 | Minimum Falling Path Sum II | Hard | ArrayDynamic ProgrammingMatrix |
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