Practice problems across 75+ categories
Practice problems frequently asked at Union Find • 89 problems | 1 Easy | 43 Medium | 43 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 46 | Minimize Maximum Value in a Grid | Hard | ArrayUnion FindGraph |
| 47 | Minimum Cost Walk in Weighted Graph | Hard | ArrayBit ManipulationUnion Find |
| 48 | Minimum Number of Visited Cells in a Grid | Hard | ArrayDynamic ProgrammingStack |
| 49 | Minimum Reverse Operations | Hard | ArrayHash TableBreadth-First Search |
| 50 | Minimum Runes to Add to Cast Spell | Hard | ArrayDepth-First SearchBreadth-First Search |
| 51 | Minimum Score of a Path Between Two Cities | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 52 | Most Stones Removed with Same Row or Column | Medium | Hash TableDepth-First SearchUnion Find |
| 53 | Number of Closed Islands | Medium | ArrayDepth-First SearchBreadth-First Search |
| 54 | Number of Connected Components in an Undirected Graph | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 55 | Number of Distinct Islands | Unknown | Hash TableDepth-First SearchBreadth-First Search |
| 56 | Number of Distinct Islands II | Hard | Hash TableDepth-First SearchBreadth-First Search |
| 57 | Number of Enclaves | Medium | ArrayDepth-First SearchBreadth-First Search |
| 58 | Number of Good Paths | Hard | ArrayHash TableTree |
| 59 | Number of Islands | Medium | ArrayDepth-First SearchBreadth-First Search |
| 60 | Number of Islands II | Hard | ArrayHash TableUnion Find |
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