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赞，明白了

Posted by RoBa at 2007-10-07 21:48:42 on Problem 3417
In Reply To:Re:up Posted by:cuiaoxiang at 2007-10-07 12:45:32

> f[x]表示从x到root的每条边都加f[x]
> 那么x---y的每条边加1
> 就可以用f[x]++, f[y]++, f[LCA(x,y)]-=2;来表示
> 最后treeDP一下，统计每条边的值就可以了

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