http://codeforces.com/problemset/problem/1105/D
The meaning of the title: There is a matrix area. At the beginning, there are multiple forces such as 1, 2, 3, 4….9, starting from the force
http://codeforces.com/problemset/problem/1105/D
The meaning of the title: There is a matrix area. At the beginning, there are multiple forces such as 1, 2, 3, 4….9, starting from the force