https://www.luogu.org/problem/P1197
This question is an enhanced version of closing the farm. The data is a bit large, and the matrix cannot be saved;
It is also a record deletion opera
https://www.luogu.org/problem/P1197
This question is an enhanced version of closing the farm. The data is a bit large, and the matrix cannot be saved;
It is also a record deletion opera