Solved Arai60/323. Number of Connected Components in an Undirected Graph #20
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oda
reviewed
Jun 2, 2025
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| - いくつかデータ構造が思い浮かんだ | ||
| - HashMapでchild→parent | ||
| - UnionFindで解けそう |
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UnionFind か DFS かでしょうね。
せっかく UnionFind 作るなら class を作って再利用性を高くし、読みやすくするとかも挑戦するといいかと思います。
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問題文：https://neetcode.io/problems/count-connected-components
（LeetCode Premiumにつき、NeetCodeで代用）