特立独行的猪猪

摘要： 基本性质 00 = 11 = 0 01 = 10 = 1 x0 = x 且 xx = 0 交换律：xy = yx 结合律：(xy)z = x(yz) 自反性：xyy = x [交换两个数] int swap(int &a,int &b) { a = a^b; b = a^b; a = a^b; } 阅读全文