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这样怎么错了？

Posted by choupigwb at 2008-11-07 10:19:23 on Problem 1935 and last updated at 2008-11-07 10:19:54
In Reply To:给后面的人一点提示 Posted by:tanbokan at 2008-09-16 09:41:55 
以K为根建树，遍历找出必须要经过的边，得边权和为sum，
要使dis最短，则有一点可以不返回，那点不就是要到的点
中离K最远的city吗？记为MAX，则mindis=sum*2-MAX。
为什么错了，大牛们看看~》。
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