2018年3月18日
[codeforces 219D] Choosing Capital for Treeland （树形dp）
摘要： The country Treeland consists of n cities, some pairs of them are connected with unidirectional roads. Overall there are n - 1 roads i... 阅读全文
posted @ 2018-03-18 23:51 Menteur_hxy 阅读(109) 评论(0) 推荐(0) 编辑