Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 166 | Minimum Swaps to Group All 1's Together | Medium | ArraySliding Window |
| 167 | Minimum Window Substring | Hard | Hash TableStringSliding Window |
| 168 | Missing Element in Sorted Array | Medium | ArrayBinary Search |
| 169 | Monotonic Array | Easy | Array |
| 170 | Most Frequent Subtree Sum | Medium | Hash TableTreeDepth-First Search |
| 171 | Most Stones Removed with Same Row or Column | Medium | Hash TableDepth-First SearchUnion Find |
| 172 | Move Pieces to Obtain a String | Medium | Two PointersString |
| 173 | Move Zeroes | Easy | ArrayTwo Pointers |
| 174 | Moving Stones Until Consecutive | Medium | MathBrainteaser |
| 175 | Multiply Strings | Medium | MathStringSimulation |
| 176 | Nested List Weight Sum | Medium | Depth-First SearchBreadth-First Search |
| 177 | Network Delay Time | Medium | Depth-First SearchBreadth-First SearchGraph |
| 178 | Next Closest Time | Medium | Hash TableStringBacktracking |
| 179 | Number of Dice Rolls With Target Sum | Medium | Dynamic Programming |
| 180 | Number of Distinct Islands | Unknown | Hash TableDepth-First SearchBreadth-First Search |
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