323. Number of Connected Components in an Undirected Graph #33
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oda
reviewed
Jan 2, 2025
| if (left > right) { | ||
| swap(left, right); | ||
| } | ||
| nodes[right] = left; |
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ほとんど Union Find ですが、ここのところで、nodes のグラフの単純化が行われていないので、結果的に計算時間はかかるかもしれませんね。ここで、元の edge.front(), edge.back() から上流の node に対して、nodes[node] = left にすれば、Union Find を展開したものになっていると思います。
oda
reviewed
Jan 2, 2025
| Space : O(n) | ||
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| step1に対してセルフレビューで修正を加えた | ||
| - 各ノードを参照する事に階層を引き上げる処理を加えた。 |
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https://discord.com/channels/1084280443945353267/1183683738635346001/1197738650998415500
高速化の手法はいくつかあるみたいですが、これでも十分ですね。
oda
reviewed
Jan 2, 2025
| public: | ||
| int countComponents(int n, vector<vector<int>>& edges) { | ||
| vector<vector<int>> adjacency_nodes = vector<vector<int>>(n, vector<int>()); | ||
| vector<char> visited = vector<char>(n, '0'); |
oda
reviewed
Jan 2, 2025
| @@ -0,0 +1,39 @@ | |||
| class Solution { | |||
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https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/description/
https://www.lintcode.com/problem/3651/
https://discord.com/channels/1084280443945353267/1183683738635346001/1197738650998415500
sakupan102/arai60-practice#22
shining-ai/leetcode#19
hayashi-ay/leetcode#37
sakupan102/arai60-practice#22
kazukiii/leetcode#20
Yoshiki-Iwasa/Arai60#21
goto-untrapped/Arai60#35
Ryotaro25/leetcode_first60#20
tarinaihitori/leetcode#19