Practice problems across 75+ categories
Practice problems frequently asked at Union Find • 89 problems | 1 Easy | 43 Medium | 43 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 76 | Regions Cut By Slashes | Medium | ArrayHash TableDepth-First Search |
| 77 | Remove Max Number of Edges to Keep Graph Fully Traversable | Hard | Union FindGraph |
| 78 | Satisfiability of Equality Equations | Medium | ArrayStringUnion Find |
| 79 | Sentence Similarity II | Medium | ArrayHash TableString |
| 80 | Similar String Groups | Hard | ArrayHash TableString |
| 81 | Smallest Missing Genetic Value in Each Subtree | Hard | Dynamic ProgrammingTreeDepth-First Search |
| 82 | Smallest String With Swaps | Medium | ArrayHash TableString |
| 83 | Subarray With Elements Greater Than Varying Threshold | Hard | ArrayStackUnion Find |
| 84 | Sum of Remoteness of All Cells | Medium | ArrayHash TableDepth-First Search |
| 85 | Surrounded Regions | Medium | ArrayDepth-First SearchBreadth-First Search |
| 86 | Swim in Rising Water | Hard | ArrayBinary SearchDepth-First Search |
| 87 | Synonymous Sentences | Medium | ArrayHash TableString |
| 88 | The Earliest Moment When Everyone Become Friends | Medium | ArrayUnion FindSorting |
| 89 | Validate Binary Tree Nodes | Medium | TreeDepth-First SearchBreadth-First Search |
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