Introduction - If you have any usage issues, please Google them yourself
The eight queen problem, an old and famous problem, is a typical case of backtracking algorithms. It is put forward the international chess Max Bethel in 1848: the queen placed eight in the 8 x 8 grid of the international chess, making it unable to attack each other, that any two queens are not in the same line, the same row or on the same diagonal, how many kinds of pendulum method.