Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 271 | Circular Sentence | Easy | String |
| 272 | Class Performance | Medium | Database |
| 273 | Classes With at Least 5 Students | Easy | Database |
| 274 | Classifying Triangles by Lengths | Easy | Database |
| 275 | Clear Digits | Easy | StringStackSimulation |
| 276 | Climbing Stairs | Easy | MathDynamic ProgrammingMemoization |
| 277 | Clone Binary Tree With Random Pointer | Medium | Hash TableTreeDepth-First Search |
| 278 | Clone Graph | Medium | Hash TableDepth-First SearchBreadth-First Search |
| 279 | Clone N-ary Tree | Medium | Hash TableTreeDepth-First Search |
| 280 | Closest Binary Search Tree Value II | Hard | Two PointersStackTree |
| 281 | Closest Divisors | Medium | Math |
| 282 | Closest Equal Element Queries | Medium | ArrayHash TableBinary Search |
| 283 | Closest Fair Integer | Medium | MathEnumeration |
| 284 | Closest Leaf in a Binary Tree | Medium | TreeDepth-First SearchBreadth-First Search |
| 285 | Closest Node to Path in Tree | Hard | ArrayTreeDepth-First Search |
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