Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3316 | Unique Substrings With Equal Digit Frequency | Medium | |
| 3317 | Unique Word Abbreviation | Medium | ArrayHash TableString |
| 3318 | Unit Conversion I | Medium | Depth-First SearchBreadth-First SearchGraph |
| 3319 | Univalued Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 3320 | Unpopular Books | Unknown | Database |
| 3321 | User Activities within Time Bounds | Hard | Database |
| 3322 | User Activity for the Past 30 Days I | Easy | Database |
| 3323 | User Activity for the Past 30 Days II | Easy | Database |
| 3324 | Users That Actively Request Confirmation Messages | Easy | Database |
| 3325 | Users With Two Purchases Within Seven Days | Medium | Database |
| 3326 | Using a Robot to Print the Lexicographically Smallest String | Medium | Hash TableStringStack |
| 3327 | UTF-8 Validation | Medium | ArrayBit Manipulation |
| 3328 | Valid Anagram | Easy | Hash TableStringSorting |
| 3329 | Valid Arrangement of Pairs | Hard | Depth-First SearchGraphEulerian Circuit |
| 3330 | Valid Boomerang | Easy | ArrayMathGeometry |
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