[AtCoder] You are given a tree with N vertices and N-1 edges. The vertices are numbered 1 to N, and the i-th edge connects Vertex a_i and b_i. - 题解

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题目信息
题号 P19710
标题 [AtCoder] You are given a tree with N vertices and N-1 edges. The vertices are numbered 1 to N, and the i-th edge connects Vertex a_i and b_i.
难度 提高-
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