upc 5220: A Possible Tree（帶權並查集。2017ICPC烏魯木齊）

5220: A Possible Tree 時間限制: 2 Sec  內存限制: 128 MB 提交: 41  解決: 11 [提交] [狀態] [討論版] [命題人:admin]php 題目描述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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