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Re:要注意删边后的图不一定还会联通，因此在写算法时要有一个判断图是否联通的操作，不能直接就返回最小生成树的的值，血的教训！！！

Posted by 1986115833 at 2020-01-19 20:14:32 on Problem 1679
In Reply To:要注意删边后的图不一定还会联通，因此在写算法时要有一个判断图是否联通的操作，不能直接就返回最小生成树的的值，血的教训！！！ Posted by:1986115833 at 2020-01-19 20:08:54 
测试数据应该都是联通的，但自己删边后会导致图不连通，如果用一个不判断图是否联通的prim()算法来算的话，就会出错
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