leetcode
1、 ^ 无进制 按位 相加 （有1才有1）
2、 ｜ 无进制 按位 相减 （不同才有1）
3、 & （同1才1）
4、 >> 右移运算符 (例如： a >> 1 相当于 a / 2 ,但是 二进制运算会比 / 快)
eor & (~eor + 1);
使用一个暴力解用于保证一定能解决此问题，然后随机生成样本，比较当前认为最优解，和暴力解的计算结果，如果随机生成 500000次都是一样的，大概率可以认为 最优解是正确的
mid = L + ((R - L) >> 1);
不建议通过 (L + R) / 2 ，因为容易溢出，没有相加前两个数较大接近溢出，那么一相加绝对溢出
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