Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 226 | Russian Doll Envelopes | Hard | ArrayBinary SearchDynamic Programming |
| 227 | Satisfiability of Equality Equations | Medium | ArrayStringUnion Find |
| 228 | Second Day Verification | Easy | Database |
| 229 | Sentence Similarity | Easy | ArrayHash TableString |
| 230 | Sentence Similarity II | Medium | ArrayHash TableString |
| 231 | Serialize and Deserialize Binary Tree | Hard | StringTreeDepth-First Search |
| 232 | Serialize and Deserialize BST | Medium | StringTreeDepth-First Search |
| 233 | Serialize and Deserialize N-ary Tree | Hard | StringTreeDepth-First Search |
| 234 | Shortest Subarray to be Removed to Make Array Sorted | Medium | ArrayTwo PointersBinary Search |
| 235 | Shuffle an Array | Medium | ArrayMathDesign |
| 236 | Simplify Path | Medium | StringStack |
| 237 | Smallest Good Base | Hard | MathBinary Search |
| 238 | Smallest Rectangle Enclosing Black Pixels | Hard | ArrayBinary SearchDepth-First Search |
| 239 | Sort Array by Increasing Frequency | Easy | ArrayHash TableSorting |
| 240 | Sort Colors | Medium | ArrayTwo PointersSorting |
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