Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 391 | One Edit Distance | Medium | Two PointersString |
| 392 | Paint House III | Hard | ArrayDynamic Programming |
| 393 | Painting a Grid With Three Different Colors | Hard | Dynamic Programming |
| 394 | Palindrome Linked List | Easy | Linked ListTwo PointersStack |
| 395 | Palindrome Number | Easy | Math |
| 396 | Palindrome Pairs | Hard | ArrayHash TableString |
| 397 | Palindromic Substrings | Medium | Two PointersStringDynamic Programming |
| 398 | Parse Lisp Expression | Hard | Hash TableStringStack |
| 399 | Partitioning Into Minimum Number Of Deci-Binary Numbers | Medium | StringGreedy |
| 400 | Pascal's Triangle | Easy | ArrayDynamic Programming |
| 401 | Pascal's Triangle II | Easy | ArrayDynamic Programming |
| 402 | Path Crossing | Easy | Hash TableString |
| 403 | Path Sum III | Medium | TreeDepth-First SearchBinary Tree |
| 404 | Peaks in Array | Hard | ArrayBinary Indexed TreeSegment Tree |
| 405 | Peeking Iterator | Medium | ArrayDesignIterator |
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