八皇后：在8X8格的国际象棋上摆放八个皇后，使其不能互相攻击，即任意两个皇后都不能处于同一行、同一列或同一斜线上，问有多少种摆法。-8 queens: in 8 X8 s international chess placed on eight queen, to make it can t attack each other, that is, any two queen not at all with one line, one and the same column or the same slash, ask how many places a law.