Practice problems across 75+ categories
Practice problems frequently asked at Union Find • 89 problems | 1 Easy | 43 Medium | 43 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 31 | Groups of Strings | Hard | StringBit ManipulationUnion Find |
| 32 | Is Graph Bipartite? | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 33 | Largest Component Size by Common Factor | Hard | ArrayHash TableMath |
| 34 | Largest Study Group | Easy | GraphBFSDFS |
| 35 | Last Day Where You Can Still Cross | Hard | ArrayBinary SearchDepth-First Search |
| 36 | Lexicographically Smallest Equivalent String | Medium | StringUnion Find |
| 37 | Longest Consecutive Sequence | Medium | ArrayHash TableUnion Find |
| 38 | Longest Uploaded Prefix | Medium | Hash TableBinary SearchUnion Find |
| 39 | Make Lexicographically Smallest Array by Swapping Elements | Medium | ArrayUnion FindSorting |
| 40 | Making A Large Island | Hard | ArrayDepth-First SearchBreadth-First Search |
| 41 | Max Area of Island | Medium | ArrayDepth-First SearchBreadth-First Search |
| 42 | Maximize Spanning Tree Stability with Upgrades | Hard | Binary SearchGreedyUnion Find |
| 43 | Maximum Number of Fish in a Grid | Medium | ArrayDepth-First SearchBreadth-First Search |
| 44 | Maximum Number of Points From Grid Queries | Hard | ArrayTwo PointersBreadth-First Search |
| 45 | Maximum Segment Sum After Removals | Hard | ArrayUnion FindPrefix Sum |
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