Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 421 | Project Employees III | Medium | Database |
| 422 | Projection Area of 3D Shapes | Easy | ArrayMathGeometry |
| 423 | Queue Reconstruction by Height | Medium | ArrayBinary Indexed TreeSegment Tree |
| 424 | Range Sum Query 2D - Mutable | Medium | ArrayDesignBinary Indexed Tree |
| 425 | Range XOR Queries with Subarray Reversals | Hard | ArrayTreeBinary Tree |
| 426 | Rearrange String k Distance Apart | Hard | Hash TableStringGreedy |
| 427 | Rearrange Words in a Sentence | Medium | StringSorting |
| 428 | Rearranging Fruits | Hard | ArrayHash TableGreedy |
| 429 | Reconstruct Itinerary | Hard | Depth-First SearchGraphEulerian Circuit |
| 430 | Reconstruct Original Digits from English | Medium | Hash TableMathString |
| 431 | Rectangle Area II | Hard | ArraySegment TreeLine Sweep |
| 432 | Reduce Array Size to The Half | Medium | ArrayHash TableGreedy |
| 433 | Reformat Phone Number | Easy | String |
| 434 | Regular Expression Matching | Hard | StringDynamic ProgrammingRecursion |
| 435 | Remove Element | Easy | ArrayTwo Pointers |
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