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Good Thought!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 Followed by: Post your reply here: |
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