2017年4月13日
ZOJ 3949 Edge to the Root（想法）（倍增）
摘要： Given a tree with n vertices, we want to add an edge between vertex 1 and vertex x, so that the sum of d(1, v) for all vertices v in the tree is minim 阅读全文
posted @ 2017-04-13 15:01 贱人方 阅读(501) 评论(0) 推荐(0) 编辑