求指教，为何60分？用并查集做的。。

P1546 [USACO3.1] 最短网络 Agri-Net

2,4,6,7四个点WA掉了
by Captain_Paul @ 2017-08-15 14:54:25

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已解决！
by Captain_Paul @ 2017-08-15 19:16:09

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