Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 451 | Rolling Average Steps | Medium | Database |
| 452 | Roman to Integer | Easy | Hash TableMathString |
| 453 | Rotate Image | Medium | ArrayMathMatrix |
| 454 | Rotated Digits | Medium | MathDynamic Programming |
| 455 | Rotting Oranges | Medium | ArrayBreadth-First SearchMatrix |
| 456 | Russian Doll Envelopes | Hard | ArrayBinary SearchDynamic Programming |
| 457 | Same Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 458 | Search a 2D Matrix | Medium | ArrayBinary SearchMatrix |
| 459 | Search a 2D Matrix II | Medium | ArrayBinary SearchDivide and Conquer |
| 460 | Search in a Binary Search Tree | Easy | TreeBinary Search TreeBinary Tree |
| 461 | Search in Rotated Sorted Array | Medium | ArrayBinary Search |
| 462 | Search in Rotated Sorted Array II | Medium | ArrayBinary Search |
| 463 | Search Suggestions System | Medium | ArrayStringBinary Search |
| 464 | Second Highest Salary II | Medium | Database |
| 465 | Second Largest Digit in a String | Easy | Hash TableString |
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