Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3301 | Uncommon Words from Two Sentences | Easy | Hash TableStringCounting |
| 3302 | Uncrossed Lines | Medium | ArrayDynamic Programming |
| 3303 | Undefined to Null | Medium | JavaScript |
| 3304 | Unique 3-Digit Even Numbers | Easy | ArrayHash TableRecursion |
| 3305 | Unique Binary Search Trees | Medium | MathDynamic ProgrammingTree |
| 3306 | Unique Binary Search Trees II | Medium | Dynamic ProgrammingBacktrackingTree |
| 3307 | Unique Email Addresses | Easy | ArrayHash TableString |
| 3308 | Unique Length-3 Palindromic Subsequences | Medium | Hash TableStringBit Manipulation |
| 3309 | Unique Morse Code Words | Easy | ArrayHash TableString |
| 3310 | Unique Number of Occurrences | Easy | ArrayHash Table |
| 3311 | Unique Orders and Customers Per Month | Easy | Database |
| 3312 | Unique Paths | Medium | MathDynamic ProgrammingCombinatorics |
| 3313 | Unique Paths II | Medium | ArrayDynamic ProgrammingMatrix |
| 3314 | Unique Paths III | Hard | ArrayBacktrackingBit Manipulation |
| 3315 | Unique Substrings in Wraparound String | Medium | StringDynamic Programming |
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