Codeforces 685B - Kay and Snowflake

2016-06-24
题目地址 描述 给出一个 n ( n ≤ 3 0 0 0 0 0 ) n(n\le 300000) n ( n ≤ 3 0 0 0 0 0 ) 个点的树,以及 q ( q ≤ 3 0 0 0 0 0 ) q(q\le 300000) q ( ......