Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 496 | Sort Characters By Frequency | Medium | Hash TableStringSorting |
| 497 | Sort Colors | Medium | ArrayTwo PointersSorting |
| 498 | Sparse Matrix Multiplication | Medium | ArrayHash TableMatrix |
| 499 | Spiral Matrix II | Medium | ArrayMatrixSimulation |
| 500 | Split Array Largest Sum | Hard | ArrayBinary SearchDynamic Programming |
| 501 | Split With Minimum Sum | Easy | MathGreedySorting |
| 502 | Sqrt(x) | Easy | MathBinary Search |
| 503 | Stone Game VI | Medium | ArrayMathGreedy |
| 504 | String Transforms Into Another String | Hard | Hash TableStringGraph |
| 505 | Strings Differ by One Character | Medium | Hash TableStringRolling Hash |
| 506 | Subarray Sum Equals K | Medium | ArrayHash TablePrefix Sum |
| 507 | Subarray Sums Divisible by K | Medium | ArrayHash TablePrefix Sum |
| 508 | Subarrays with K Different Integers | Hard | ArrayHash TableSliding Window |
| 509 | Subrectangle Queries | Medium | ArrayDesignMatrix |
| 510 | Subsets | Medium | ArrayBacktrackingBit Manipulation |
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