Introduction - If you have any usage issues, please Google them yourself
Eight queens problem is an old and well-known problem is a typical example backtracking algorithm. The problem is that the nineteenth century the famous mathematician Gauss in 1850: Under 8X8 grid placed eight on the international chess queen, so that it could not attack each other, that any two Queens can not in the same row, same column or the same slash on the question of how many pendulum method.