@[Lee666666](/user/280233) <https://www.luogu.com.cn/problem/P4722>
by Argvchs @ 2023-09-10 22:35:34
@[Argvchs](/user/533270) 懂了，双倍经验（
谢谢dalao Orz
by Lee666666 @ 2023-09-10 22:53:23