2020年7月15日
[CF334D]Water Tree
摘要： 【原题】 Mad scientist Mike has constructed a rooted tree, which consists of n vertices. Each vertex is a reservoir which can be either empty or filled wi 阅读全文
posted @ 2020-07-15 14:47 kurum! 阅读(206) 评论(0) 推荐(0)