Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 181 | Number of Equal Numbers Blocks | Medium | ArrayBinary SearchInteractive |
| 182 | Number of Nodes in the Sub-Tree With the Same Label | Medium | Hash TableTreeDepth-First Search |
| 183 | Number of Submatrices That Sum to Target | Hard | ArrayHash TableMatrix |
| 184 | Number of Ways to Wear Different Hats to Each Other | Hard | ArrayDynamic ProgrammingBit Manipulation |
| 185 | One Edit Distance | Medium | Two PointersString |
| 186 | Optimal Division | Medium | ArrayMathDynamic Programming |
| 187 | Out of Boundary Paths | Medium | Dynamic Programming |
| 188 | Paint House II | Hard | ArrayDynamic Programming |
| 189 | Partition Array into Disjoint Intervals | Medium | Array |
| 190 | Patching Array | Hard | ArrayGreedy |
| 191 | Path Sum III | Medium | TreeDepth-First SearchBinary Tree |
| 192 | Path With Minimum Effort | Medium | ArrayBinary SearchDepth-First Search |
| 193 | Peak Index in a Mountain Array | Medium | ArrayBinary Search |
| 194 | Permutation in String | Medium | Hash TableTwo PointersString |
| 195 | Plus One Linked List | Medium | Linked ListMath |
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