Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 436 | Remove Nth Node From End of List | Medium | Linked ListTwo Pointers |
| 437 | Remove One Element to Make the Array Strictly Increasing | Easy | Array |
| 438 | Remove Outermost Parentheses | Easy | StringStack |
| 439 | Restore IP Addresses | Medium | StringBacktracking |
| 440 | Reverse Bits | Easy | Divide and ConquerBit Manipulation |
| 441 | Reverse Integer | Medium | Math |
| 442 | Reverse Linked List | Easy | Linked ListRecursion |
| 443 | Reverse Linked List II | Medium | Linked List |
| 444 | Reverse Only Letters | Easy | Two PointersString |
| 445 | Reverse String II | Easy | Two PointersString |
| 446 | Reverse Vowels of a String | Easy | Two PointersString |
| 447 | Reverse Words in a String III | Easy | Two PointersString |
| 448 | Richest Customer Wealth | Easy | ArrayMatrix |
| 449 | RLE Iterator | Medium | ArrayDesignCounting |
| 450 | Robot Collisions | Hard | ArrayStackSorting |
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