Introduction - If you have any usage issues, please Google them yourself
Eight queens problem is that, in the international chess board, the place can not afford to eat eight pieces to each other, that is not in a line with each other, vertical and diagonal lines on. Eight queens problem requires eight Queen can not afford to eat each other, that is, asked each other not in the same straight line, horizontal line, vertical line, you can by a function, consider the slope to achieve the problem.