Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 136 | Longest Substring with At Most K Distinct Characters | Medium | Hash TableStringSliding Window |
| 137 | Longest Univalue Path | Medium | TreeDepth-First SearchBinary Tree |
| 138 | Longest Well-Performing Interval | Medium | ArrayHash TableStack |
| 139 | Loud and Rich | Medium | ArrayDepth-First SearchGraph |
| 140 | Lowest Common Ancestor of a Binary Tree II | Medium | TreeDepth-First SearchBinary Tree |
| 141 | Lowest Common Ancestor of a Binary Tree III | Medium | Hash TableTwo PointersTree |
| 142 | Lowest Common Ancestor of Deepest Leaves | Medium | Hash TableTreeDepth-First Search |
| 143 | Majority Element II | Medium | ArrayHash TableSorting |
| 144 | Make The String Great | Easy | StringStack |
| 145 | Masking Personal Information | Medium | String |
| 146 | Matrix Cells in Distance Order | Easy | ArrayMathGeometry |
| 147 | Max Area of Island | Medium | ArrayDepth-First SearchBreadth-First Search |
| 148 | Maximal Square | Medium | ArrayDynamic ProgrammingMatrix |
| 149 | Maximum Equal Frequency | Hard | ArrayHash Table |
| 150 | Maximum Font to Fit a Sentence in a Screen | Medium | ArrayStringBinary Search |
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