Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 481 | Single Number III | Medium | ArrayBit Manipulation |
| 482 | Single-Row Keyboard | Easy | Hash TableString |
| 483 | Sliding Window Maximum | Hard | ArrayQueueSliding Window |
| 484 | Sliding Window Median | Hard | ArrayHash TableSliding Window |
| 485 | Slowest Key | Easy | ArrayString |
| 486 | Smallest Divisible Digit Product I | Easy | MathEnumeration |
| 487 | Smallest K-Length Subsequence With Occurrences of a Letter | Hard | StringStackGreedy |
| 488 | Smallest Number in Infinite Set | Medium | Hash TableDesignHeap (Priority Queue) |
| 489 | Smallest Palindromic Rearrangement I | Medium | StringSortingCounting Sort |
| 490 | Smallest Range I | Easy | ArrayMath |
| 491 | Smallest Rotation with Highest Score | Hard | ArrayPrefix Sum |
| 492 | Smallest Subarray to Sort in Every Sliding Window | Medium | ArrayTwo PointersStack |
| 493 | Sort an Array | Medium | ArrayDivide and ConquerSorting |
| 494 | Sort Array by Increasing Frequency | Easy | ArrayHash TableSorting |
| 495 | Sort Array By Parity II | Easy | ArrayTwo PointersSorting |
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