Practice problems across 75+ categories
Practice problems frequently asked at Union Find • 89 problems | 1 Easy | 43 Medium | 43 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 61 | Number of Operations to Make Network Connected | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 62 | Number of Provinces | Unknown | Depth-First SearchBreadth-First SearchUnion Find |
| 63 | Number of Unique Categories | Medium | Union FindInteractiveCounting |
| 64 | Number of Ways to Reorder Array to Get Same BST | Hard | ArrayMathDivide and Conquer |
| 65 | Optimize Water Distribution in a Village | Hard | Union FindGraphHeap (Priority Queue) |
| 66 | Path Existence Queries in a Graph I | Medium | ArrayHash TableBinary Search |
| 67 | Path With Maximum Minimum Value | Medium | ArrayBinary SearchDepth-First Search |
| 68 | Path With Minimum Effort | Medium | ArrayBinary SearchDepth-First Search |
| 69 | Possible Bipartition | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 70 | Process Restricted Friend Requests | Hard | Union FindGraph |
| 71 | Properties Graph | Medium | ArrayHash TableDepth-First Search |
| 72 | Rank Transform of a Matrix | Hard | ArrayUnion FindGraph |
| 73 | Reachable Nodes With Restrictions | Medium | ArrayHash TableTree |
| 74 | Redundant Connection | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 75 | Redundant Connection II | Hard | Depth-First SearchBreadth-First SearchUnion Find |
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