Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 556 | Valid Square | Medium | MathGeometry |
| 557 | Valid Sudoku | Medium | ArrayHash TableMatrix |
| 558 | Valid Triangle Number | Medium | ArrayTwo PointersBinary Search |
| 559 | Validate Binary Search Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 560 | Walls and Gates | Medium | ArrayBreadth-First SearchMatrix |
| 561 | Water and Jug Problem | Medium | MathDepth-First SearchBreadth-First Search |
| 562 | Water Bottles | Easy | MathSimulation |
| 563 | Water Bottles II | Medium | MathSimulation |
| 564 | Widest Vertical Area Between Two Points Containing No Points | Easy | ArraySorting |
| 565 | Wiggle Sort | Medium | ArrayGreedySorting |
| 566 | Word Break | Medium | ArrayHash TableString |
| 567 | Word Break II | Hard | ArrayHash TableString |
| 568 | Word Ladder II | Hard | Hash TableStringBacktracking |
| 569 | Word Pattern | Easy | Hash TableString |
| 570 | Word Search II | Hard | ArrayStringBacktracking |
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