八皇后是个古老而有趣的游戏，是由高斯于1850年首先提出的。要求在国际象棋的棋盘上放置八个皇后，使其不能相互攻击，即任意两个皇后不能处于棋盘的同一行、同一列和同一条对角线上。试问有多少种放法？-Eight Queens is an old and interesting game, by Gauss in 1850 first proposed. Requirements in place on the chess board eight queen, it can not attack each other, that any two queens can not board the same line in the same column and with a diagonal. How many kinds of put method?