Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 76 | Find Latest Group of Size M | Medium | ArrayHash TableBinary Search |
| 77 | Find Nearest Right Node in Binary Tree | Medium | TreeBreadth-First SearchBinary Tree |
| 78 | Find Positive Integer Solution for a Given Equation | Medium | MathTwo PointersBinary Search |
| 79 | Find the Celebrity | Medium | Two PointersGraphInteractive |
| 80 | Find The K-th Lucky Number | Medium | MathStringBit Manipulation |
| 81 | Find the Longest Substring Containing Vowels in Even Counts | Medium | Hash TableStringBit Manipulation |
| 82 | Find the Winner of an Array Game | Medium | ArraySimulation |
| 83 | Find the Winner of the Circular Game | Medium | ArrayMathRecursion |
| 84 | First Bad Version | Easy | Binary SearchInteractive |
| 85 | Flatten 2D Vector | Medium | ArrayTwo PointersDesign |
| 86 | Flip Equivalent Binary Trees | Medium | TreeDepth-First SearchBinary Tree |
| 87 | Flip Game II | Medium | MathDynamic ProgrammingBacktracking |
| 88 | Flower Planting With No Adjacent | Medium | Depth-First SearchBreadth-First SearchGraph |
| 89 | Friend Requests I: Overall Acceptance Rate | Unknown | Database |
| 90 | Friend Requests II: Who Has the Most Friends | Medium | Database |
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