Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2821 | Unique Binary Search Trees | Medium | MathDynamic ProgrammingTree |
| 2822 | Unique Binary Search Trees II | Medium | Dynamic ProgrammingBacktrackingTree |
| 2823 | Unique Email Addresses | Easy | ArrayHash TableString |
| 2824 | Unique Length-3 Palindromic Subsequences | Medium | Hash TableStringBit Manipulation |
| 2825 | Unique Number of Occurrences | Easy | ArrayHash Table |
| 2826 | Unique Orders and Customers Per Month | Easy | Database |
| 2827 | Unique Paths | Medium | MathDynamic ProgrammingCombinatorics |
| 2828 | Unique Paths II | Medium | ArrayDynamic ProgrammingMatrix |
| 2829 | Unique Paths III | Hard | ArrayBacktrackingBit Manipulation |
| 2830 | Unique Substrings in Wraparound String | Medium | StringDynamic Programming |
| 2831 | Unique Substrings With Equal Digit Frequency | Medium | |
| 2832 | Unit Conversion I | Medium | Depth-First SearchBreadth-First SearchGraph |
| 2833 | Univalued Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 2834 | Unpopular Books | Unknown | Database |
| 2835 | User Activities within Time Bounds | Hard | Database |
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