Practice problems across 75+ categories
Practice problems frequently asked at Array • 1947 problems | 398 Easy | 1049 Medium | 497 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | 01 Matrix | Medium | ArrayDynamic ProgrammingBreadth-First Search |
| 2 | 1-bit and 2-bit Characters | Easy | Array |
| 3 | 132 Pattern | Medium | ArrayBinary SearchStack |
| 4 | 24 Game | Hard | ArrayMathBacktracking |
| 5 | 3Sum | Medium | ArrayTwo PointersSorting |
| 6 | 3Sum Closest | Medium | ArrayTwo PointersSorting |
| 7 | 3Sum Smaller | Medium | ArrayTwo PointersBinary Search |
| 8 | 3Sum With Multiplicity | Medium | ArrayHash TableTwo Pointers |
| 9 | 4Sum | Medium | ArrayTwo PointersSorting |
| 10 | 4Sum II | Medium | ArrayHash Table |
| 11 | Add Bold Tag in String | Medium | ArrayHash TableString |
| 12 | Add Minimum Number of Rungs | Medium | ArrayGreedy |
| 13 | Add to Array-Form of Integer | Easy | ArrayMath |
| 14 | Adding Spaces to a String | Medium | ArrayTwo PointersString |
| 15 | Adding Two Negabinary Numbers | Medium | ArrayMath |
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