Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 76 | Clone Binary Tree With Random Pointer | Medium | Hash TableTreeDepth-First Search |
| 77 | Clone Graph | Medium | Hash TableDepth-First SearchBreadth-First Search |
| 78 | Clone N-ary Tree | Medium | Hash TableTreeDepth-First Search |
| 79 | Closest Binary Search Tree Value II | Hard | Two PointersStackTree |
| 80 | Closest Dessert Cost | Medium | ArrayDynamic ProgrammingBacktracking |
| 81 | Closest Equal Element Queries | Medium | ArrayHash TableBinary Search |
| 82 | Coin Change | Medium | ArrayDynamic ProgrammingBreadth-First Search |
| 83 | Combination Sum | Medium | ArrayBacktracking |
| 84 | Combination Sum II | Medium | ArrayBacktracking |
| 85 | Combine Two Tables | Easy | Database |
| 86 | Compare Version Numbers | Medium | Two PointersString |
| 87 | Complement of Base 10 Integer | Easy | Bit Manipulation |
| 88 | Construct Binary Tree from Preorder and Inorder Traversal | Medium | ArrayHash TableDivide and Conquer |
| 89 | Construct the Rectangle | Easy | Math |
| 90 | Container With Most Water | Medium | ArrayTwo PointersGreedy |
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