2020年4月26日
Kefa and Park CodeForces - 580C
摘要： Kefa decided to celebrate his first big salary by going to the restaurant. He lives by an unusual park. The park is a rooted tree consisting of n vert 阅读全文
posted @ 2020-04-26 10:02 XXXSANS 阅读(199) 评论(0) 推荐(0)