Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3511 | Uncrossed Lines | Medium | ArrayDynamic Programming |
| 3512 | Undefined to Null | Medium | JavaScript |
| 3513 | Unique 3-Digit Even Numbers | Easy | ArrayHash TableRecursion |
| 3514 | Unique Binary Search Trees | Medium | MathDynamic ProgrammingTree |
| 3515 | Unique Binary Search Trees II | Medium | Dynamic ProgrammingBacktrackingTree |
| 3516 | Unique Email Addresses | Easy | ArrayHash TableString |
| 3517 | Unique Length-3 Palindromic Subsequences | Medium | Hash TableStringBit Manipulation |
| 3518 | Unique Morse Code Words | Easy | ArrayHash TableString |
| 3519 | Unique Number of Occurrences | Easy | ArrayHash Table |
| 3520 | Unique Orders and Customers Per Month | Easy | Database |
| 3521 | Unique Paths | Medium | MathDynamic ProgrammingCombinatorics |
| 3522 | Unique Paths II | Medium | ArrayDynamic ProgrammingMatrix |
| 3523 | Unique Paths III | Hard | ArrayBacktrackingBit Manipulation |
| 3524 | Unique Substrings in Wraparound String | Medium | StringDynamic Programming |
| 3525 | Unique Substrings With Equal Digit Frequency | Medium |
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