2018年第三阶段个人训练赛第四场6690 Problem D Transit Tree Path
题目描述You are given a tree with N vertices.Here, a tree is a kind of graph, and more specifically, a connected undirected graph with N−1 edges, where N is the number of its vertices.The i-th edge (1...
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2018-07-29 08:43:49 ·
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