Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 46 | Binary Tree Preorder Traversal | Easy | StackTreeDepth-First Search |
| 47 | Binary Tree Upside Down | Medium | TreeDepth-First SearchBinary Tree |
| 48 | Binary Tree Zigzag Level Order Traversal | Medium | TreeBreadth-First SearchBinary Tree |
| 49 | Binary Watch | Easy | BacktrackingBit Manipulation |
| 50 | Bitwise AND of Numbers Range | Medium | Bit Manipulation |
| 51 | Boundary of Binary Tree | Medium | TreeDepth-First SearchBinary Tree |
| 52 | Build a Matrix With Conditions | Hard | ArrayGraphTopological Sort |
| 53 | Bulb Switcher | Medium | MathBrainteaser |
| 54 | Bulls and Cows | Medium | Hash TableStringCounting |
| 55 | Bus Routes | Hard | ArrayHash TableBreadth-First Search |
| 56 | Cache With Time Limit | Medium | JavaScript |
| 57 | Calculate Parking Fees and Duration | Medium | Database |
| 58 | Calculate Salaries | Medium | Database |
| 59 | Can Convert String in K Moves | Medium | Hash TableString |
| 60 | Candy | Hard | ArrayGreedy |
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