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摘要: B. Alyona and a tree Alyona has a tree with n vertices. The root of the tree is the vertex 1. In each vertex Alyona wrote an positive integer, in the 阅读全文
posted @ 2019-03-12 19:29 iPlayForSG 阅读(420) 评论(0) 推荐(0) 编辑
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