Practice problems across 75+ categories
Practice problems frequently asked at Union Find • 89 problems | 1 Easy | 43 Medium | 43 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 31 | Last Day Where You Can Still Cross | Hard | ArrayBinary SearchDepth-First Search |
| 32 | Lexicographically Smallest Equivalent String | Medium | StringUnion Find |
| 33 | Longest Consecutive Sequence | Medium | ArrayHash TableUnion Find |
| 34 | Longest Uploaded Prefix | Medium | Hash TableBinary SearchUnion Find |
| 35 | Make Lexicographically Smallest Array by Swapping Elements | Medium | ArrayUnion FindSorting |
| 36 | Making A Large Island | Hard | ArrayDepth-First SearchBreadth-First Search |
| 37 | Max Area of Island | Medium | ArrayDepth-First SearchBreadth-First Search |
| 38 | Maximize Spanning Tree Stability with Upgrades | Hard | Binary SearchGreedyUnion Find |
| 39 | Maximum Number of Fish in a Grid | Medium | ArrayDepth-First SearchBreadth-First Search |
| 40 | Maximum Number of Points From Grid Queries | Hard | ArrayTwo PointersBreadth-First Search |
| 41 | Maximum Segment Sum After Removals | Hard | ArrayUnion FindPrefix Sum |
| 42 | Min Cost to Connect All Points | Medium | ArrayUnion FindGraph |
| 43 | Minimize Hamming Distance After Swap Operations | Medium | ArrayDepth-First SearchUnion Find |
| 44 | Minimize Malware Spread | Hard | ArrayHash TableDepth-First Search |
| 45 | Minimize Malware Spread II | Hard | ArrayHash TableDepth-First Search |
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