【HDU - 2376】Average distance (树上任意两点之间的距离之和的平均值、计算结点的贡献度)
Given a tree, calculate the average distance between two vertices in the tree. For example, the average distance between two vertices in the following tree is (d 01 + d 02 + d 03 + d 04 + d 12 +d 13 +...
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2018-11-15 19:16:41 ·
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