Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 466 | Second Minimum Node In a Binary Tree | Easy | TreeDepth-First SearchBinary Tree |
| 467 | Second Minimum Time to Reach Destination | Hard | Breadth-First SearchGraphShortest Path |
| 468 | Self Dividing Numbers | Easy | Math |
| 469 | Sentence Similarity III | Medium | ArrayTwo PointersString |
| 470 | Sequentially Ordinal Rank Tracker | Hard | DesignHeap (Priority Queue)Data Stream |
| 471 | Serialize and Deserialize BST | Medium | StringTreeDepth-First Search |
| 472 | Serialize and Deserialize N-ary Tree | Hard | StringTreeDepth-First Search |
| 473 | Shift 2D Grid | Easy | ArrayMatrixSimulation |
| 474 | Shortest Completing Word | Easy | ArrayHash TableString |
| 475 | Shortest Cycle in a Graph | Hard | Breadth-First SearchGraph |
| 476 | Shortest Subarray with Sum at Least K | Hard | ArrayBinary SearchQueue |
| 477 | Shortest Unsorted Continuous Subarray | Medium | ArrayTwo PointersStack |
| 478 | Similar RGB Color | Easy | MathStringEnumeration |
| 479 | Single Number | Easy | ArrayBit Manipulation |
| 480 | Single Number II | Medium | ArrayBit Manipulation |
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