hack 数据：
3 3 2 .#S .#. ...
输出：
0
撤下以下题解：
https://www.luogu.com.cn/article/kdsw6yk5
https://www.luogu.com.cn/article/el3wwjzf
https://www.luogu.com.cn/article/fmhu7ytd
https://www.luogu.com.cn/article/o2sabc6x
https://www.luogu.com.cn/article/d235s6yc
@cff_0102 @luogu_gza
