Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 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 | 2 Keys Keyboard | Medium | MathDynamic Programming |
| 5 | 24 Game | Hard | ArrayMathBacktracking |
| 6 | 3Sum | Medium | ArrayTwo PointersSorting |
| 7 | 3Sum Closest | Medium | ArrayTwo PointersSorting |
| 8 | 3Sum Smaller | Medium | ArrayTwo PointersBinary Search |
| 9 | 3Sum With Multiplicity | Medium | ArrayHash TableTwo Pointers |
| 10 | 4 Keys Keyboard | Medium | MathDynamic Programming |
| 11 | 4Sum | Medium | ArrayTwo PointersSorting |
| 12 | 4Sum II | Medium | ArrayHash Table |
| 13 | A Number After a Double Reversal | Easy | Math |
| 14 | Abbreviating the Product of a Range | Hard | Math |
| 15 | Accepted Candidates From the Interviews | Medium | Database |
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