@[_Z_F_R_](/user/911417) 线段树内数组大小应开到 $n$ 的 $4$ 倍。
by what_else @ 2024-01-07 12:54:16
@[what_else](/user/539495) 你说的对，但是是否开成 4 倍没有影响（
by _Z_F_R_ @ 2024-01-07 13:20:10
@[_Z_F_R_](/user/911417) 好好好
by what_else @ 2024-01-07 13:33:08
为什么没
by what_else @ 2024-01-07 13:34:03
是我 sb 了
by what_else @ 2024-01-07 13:36:19
经检查，Dfs1 处出现了玄学错误
by _Z_F_R_ @ 2024-01-07 13:36:48