0^0就是0,1^1就是0,0^1就是1,a^x^x=a,x^x=0,
异或交换a b
//a b地址不能一样,否则为0
a^=b;
b^=a;
a^=b;
取石子游戏&异或和 http://blog.youkuaiyun.com/qq_33346538/article/details/77507726
0^0就是0,1^1就是0,0^1就是1,a^x^x=a,x^x=0,
异或交换a b
//a b地址不能一样,否则为0
a^=b;
b^=a;
a^=b;
取石子游戏&异或和 http://blog.youkuaiyun.com/qq_33346538/article/details/77507726