Practice problems across 75+ categories
Practice problems frequently asked at Design • 128 problems | 15 Easy | 81 Medium | 30 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 61 | Exam Room | Medium | DesignHeap (Priority Queue)Ordered Set |
| 62 | Fancy Sequence | Hard | MathDesignSegment Tree |
| 63 | Find Consecutive Integers from a Data Stream | Medium | Hash TableDesignQueue |
| 64 | Find Elements in a Contaminated Binary Tree | Medium | Hash TableTreeDepth-First Search |
| 65 | Find Median from Data Stream | Hard | Two PointersDesignSorting |
| 66 | Finding MK Average | Hard | DesignQueueHeap (Priority Queue) |
| 67 | Finding Pairs With a Certain Sum | Medium | ArrayHash TableDesign |
| 68 | First Unique Number | Medium | ArrayHash TableDesign |
| 69 | Flatten 2D Vector | Medium | ArrayTwo PointersDesign |
| 70 | Flatten Nested List Iterator | Medium | StackTreeDepth-First Search |
| 71 | Frequency Tracker | Medium | Hash TableDesign |
| 72 | Implement Magic Dictionary | Medium | Hash TableStringDepth-First Search |
| 73 | Implement Queue using Stacks | Easy | StackDesignQueue |
| 74 | Implement Router | Medium | ArrayHash TableBinary Search |
| 75 | Implement Stack using Queues | Easy | StackDesignQueue |
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