Introduction - If you have any usage issues, please Google them yourself
On the board as ★ problem description: like chess on the board is always moving along the diagonal direction. If two like each other in the position of the other party can reach, you can attack each other. ★ experimental task: give you two integers n and k, obtained the k as placed on an nn chessboard, and to ensure that the number of programs that they can not attack each other.