八皇后问题，老归老，但试图用各种方法来实现求解，出乎意料的是，同样的算法，非递归实现的速度竟然比递归实现慢！-Eight queen problem, the old to the old, but trying to use various methods to achieve Solving Surprisingly, the same algorithm, the speed of non-recursive implementation was slower than the recur