Practice problems across 75+ categories
Practice problems frequently asked at Design • 128 problems | 15 Easy | 81 Medium | 30 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 16 | Design a Todo List | Medium | ArrayHash TableString |
| 17 | Design Add and Search Words Data Structure | Medium | StringDepth-First SearchDesign |
| 18 | Design an Array Statistics Tracker | Hard | Hash TableBinary SearchDesign |
| 19 | Design an ATM Machine | Medium | ArrayGreedyDesign |
| 20 | Design an Expression Tree With Evaluate Function | Medium | ArrayMathStack |
| 21 | Design an Ordered Stream | Easy | ArrayHash TableDesign |
| 22 | Design Authentication Manager | Medium | Hash TableLinked ListDesign |
| 23 | Design Bitset | Medium | ArrayHash TableString |
| 24 | Design Browser History | Medium | ArrayLinked ListStack |
| 25 | Design Circular Deque | Medium | ArrayLinked ListDesign |
| 26 | Design Circular Queue | Medium | ArrayLinked ListDesign |
| 27 | Design Compressed String Iterator | Easy | ArrayStringDesign |
| 28 | Design Excel Sum Formula | Unknown | ArrayHash TableString |
| 29 | Design File System | Medium | Hash TableStringDesign |
| 30 | Design Front Middle Back Queue | Medium | ArrayLinked ListDesign |
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