@[Eason333999](/user/741244) 看看有关题目帖子，很容易解决的 
by Light_az @ 2023-02-18 16:49:27
@[lianzhuo](/user/654958) 谢谢。
by Eason_cyx @ 2023-02-18 16:54:04
见https://www.luogu.com.cn/discuss/654636
by liyichen6 @ 2023-08-08 20:29:10