upc 5220: A Possible Tree(带权并查集。2017ICPC乌鲁木齐)

5220: A Possible Tree 时间限制: 2 Sec  内存限制: 128 MB 提交: 41  解决: 11 [提交] [状态] [讨论版] [命题人:admin]php 题目描述node Alice knows that Bob has a secret tree (in terms of graph theory) with n nodes with n − 1 weighte
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