附：在Vjudge测可以过 [链接](https://vjudge.net/problem/HYSBZ-3875) by Eason_AC @ 2020-02-24 20:50:51
感谢大家！ 快读+$O_2$吸氧过了 不过还是想在线征集不吸氧过的方法qwq by Eason_AC @ 2020-02-24 21:01:16