https://www.luogu.com.cn/article/sv23ppd0
2.1.2 节是第二问的答案。
至于第一问自己找吧。没啥功夫看。
by Aleph_Drawer @ 2024-02-27 17:43:39
@[Alpha_Drawer](/user/181571) 感谢感谢
by ricky0916 @ 2024-02-27 18:57:26