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Ikki强烈号召大家讨论这个题目2114 Boatherds 绝对的好题目。 题意简述:N(N<=10000)个点的一棵树,每条边都有权值,给你一个值x,判断树上 是否有路径,使得路径的边的总长度等于x。 Followed by:
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