Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | 24 Game | Hard | ArrayMathBacktracking |
| 2 | 3Sum Smaller | Medium | ArrayTwo PointersBinary Search |
| 3 | Accounts Merge | Medium | StackSegment Tree |
| 4 | Adding Two Negabinary Numbers | Medium | ArrayMath |
| 5 | All Nodes Distance K in Binary Tree | Medium | Hash TableTreeDepth-First Search |
| 6 | Alphabet Board Path | Medium | Hash TableString |
| 7 | Ambiguous Coordinates | Medium | StringBacktrackingEnumeration |
| 8 | Arrange Table by Gender | Medium | Database |
| 9 | Article Views II | Medium | Database |
| 10 | Assign Cookies | Easy | ArrayTwo PointersGreedy |
| 11 | Average of Levels in Binary Tree | Easy | TreeDepth-First SearchBreadth-First Search |
| 12 | Backspace String Compare | Easy | Two PointersStringStack |
| 13 | Balance a Binary Search Tree | Medium | Divide and ConquerGreedyTree |
| 14 | Basic Calculator II | Medium | MathStringStack |
| 15 | Binary Search Tree Iterator | Medium | StackTreeDesign |
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