Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 256 | Toeplitz Matrix | Easy | ArrayMatrix |
| 257 | Total Hamming Distance | Medium | ArrayMathBit Manipulation |
| 258 | Tournament Winners | Hard | Database |
| 259 | Transform to Chessboard | Hard | ArrayMathBit Manipulation |
| 260 | Two Sum III - Data structure design | Easy | ArrayHash TableTwo Pointers |
| 261 | Unique Morse Code Words | Easy | ArrayHash TableString |
| 262 | User Activity for the Past 30 Days II | Easy | Database |
| 263 | Valid Mountain Array | Easy | Array |
| 264 | Valid Palindrome II | Easy | Two PointersStringGreedy |
| 265 | Valid Permutations for DI Sequence | Hard | StringDynamic ProgrammingPrefix Sum |
| 266 | Validate IP Address | Medium | String |
| 267 | Verify Preorder Sequence in Binary Search Tree | Medium | ArrayStackTree |
| 268 | Verifying an Alien Dictionary | Easy | ArrayHash TableString |
| 269 | Vowel Spellchecker | Medium | ArrayHash TableString |
| 270 | Walking Robot Simulation | Medium | ArrayHash TableSimulation |
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