Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 151 | Maximum Gap | Medium | ArraySortingBucket Sort |
| 152 | Maximum Length of Repeated Subarray | Medium | ArrayBinary SearchDynamic Programming |
| 153 | Maximum Length of Subarray With Positive Product | Medium | ArrayDynamic ProgrammingGreedy |
| 154 | Maximum Side Length of a Square with Sum Less than or Equal to Threshold | Medium | ArrayBinary SearchMatrix |
| 155 | Maximum Swap | Medium | MathGreedy |
| 156 | Merge Two Binary Trees | Easy | TreeDepth-First SearchBreadth-First Search |
| 157 | Minimize Malware Spread II | Hard | ArrayHash TableDepth-First Search |
| 158 | Minimum Add to Make Parentheses Valid | Medium | StringStackGreedy |
| 159 | Minimum Adjacent Swaps for K Consecutive Ones | Hard | ArrayGreedySliding Window |
| 160 | Minimum Cost to Hire K Workers | Hard | ArrayGreedySorting |
| 161 | Minimum Number of Flips to Convert Binary Matrix to Zero Matrix | Hard | ArrayHash TableBit Manipulation |
| 162 | Minimum Number of Food Buckets to Feed the Hamsters | Medium | StringDynamic ProgrammingGreedy |
| 163 | Minimum Number of Moves to Make Palindrome | Hard | Two PointersStringGreedy |
| 164 | Minimum Operations to Reduce X to Zero | Medium | ArrayHash TableBinary Search |
| 165 | Minimum Size Subarray Sum | Medium | ArrayBinary SearchSliding Window |
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