Sengxian's Blog

题目地址 描述 给定一个 n ( n ≤ 5 0 0 0 0 0 ) n(n\le 500000) n ( n ≤ 5 0 0 0 0 0 ) 个点 m ( m ≤ 1 0 0 0 0 0 0 ) m(m\le 1000000) m ( ......