Practice problems across 75+ categories
Practice problems frequently asked at Apple • 571 problems | 192 Easy | 283 Medium | 92 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 511 | Subsets II | Medium | ArrayBacktrackingBit Manipulation |
| 512 | Substring with Concatenation of All Words | Hard | Hash TableStringSliding Window |
| 513 | Subtree of Another Tree | Easy | TreeDepth-First SearchString Matching |
| 514 | Sudoku Solver | Hard | ArrayHash TableBacktracking |
| 515 | Sum of All Odd Length Subarrays | Easy | ArrayMathPrefix Sum |
| 516 | Sum of Digits in the Minimum Number | Easy | ArrayMath |
| 517 | Sum of Digits of String After Convert | Easy | StringSimulation |
| 518 | Sum of Two Integers | Medium | MathBit Manipulation |
| 519 | Surface Area of 3D Shapes | Easy | ArrayMathGeometry |
| 520 | Surrounded Regions | Medium | ArrayDepth-First SearchBreadth-First Search |
| 521 | Swap Nodes in Pairs | Medium | Linked ListRecursion |
| 522 | Swapping Nodes in a Linked List | Medium | Linked ListTwo Pointers |
| 523 | Symmetric Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 524 | Target Sum | Medium | ArrayDynamic ProgrammingBacktracking |
| 525 | Task Scheduler | Medium | ArrayHash TableGreedy |
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