摘要: 50 1(19.10.23)(树的性质): https://codeforces.com/contest/516/problem/D https://codeforces.com/contest/516/submission/63242051 大意: 给一棵树,定义$d[x]=max(dis(x,y 阅读全文
posted @ 2019-10-23 22:23 Cold_Chair 阅读(706) 评论(1) 推荐(0) 编辑