例子

如把31转换为14，须要改变2个bit位。

(31)10=(11111)2

(14)10=(01110)2

贴代码

class Solution {public:    /**     *@param a, b: Two integer     *return: An integer     */    int bitSwapRequired(int a, int b) {        // write your code here        unsigned int  flag = 1;        int i =0;        int j = 0;        int c= 0;        while (flag) {            i = a & flag;            j = b & flag;           if (i ^ j) {               c++;           }            flag = flag << 1;        }        return c;    }};