Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3301 | Unique Number of Occurrences | Easy | ArrayHash Table |
| 3302 | Unique Orders and Customers Per Month | Easy | Database |
| 3303 | Unique Paths | Medium | MathDynamic ProgrammingCombinatorics |
| 3304 | Unique Paths II | Medium | ArrayDynamic ProgrammingMatrix |
| 3305 | Unique Paths III | Hard | ArrayBacktrackingBit Manipulation |
| 3306 | Unique Substrings in Wraparound String | Medium | StringDynamic Programming |
| 3307 | Unique Substrings With Equal Digit Frequency | Medium | |
| 3308 | Unique Word Abbreviation | Medium | ArrayHash TableString |
| 3309 | Unit Conversion I | Medium | Depth-First SearchBreadth-First SearchGraph |
| 3310 | Univalued Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 3311 | Unpopular Books | Unknown | Database |
| 3312 | User Activities within Time Bounds | Hard | Database |
| 3313 | User Activity for the Past 30 Days I | Easy | Database |
| 3314 | User Activity for the Past 30 Days II | Easy | Database |
| 3315 | Users That Actively Request Confirmation Messages | Easy | Database |
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