1. 判断偶数:number & 1 == 0 (number & 0x1)判断奇数number & 1 == 1
number &
1
==
0 (number & 0x1)判断奇数number & 1 == 1
== 1
2.int mid = (low+high)>>1;
3.用左移(<<)右移(>>)代替乘2除2