The Hamming distance between two integers is the number of positions at which the corresponding bits are different.
Given two integers x
and y
, calculate the Hamming distance.
Note:
0 ≤ x
, y
< 231.
Example:
Input: x = 1, y = 4 Output: 2 Explanation: 1 (0 0 0 1) 4 (0 1 0 0) ↑ ↑ The above arrows point to positions where the corresponding bits are different.
分析:
返回汉明距离即返回两个数的二进制形式对应位置不同位的个数。按位异或两个数对应位上的数,由于异或相同为0,不同为1,因此只要把为1的情况累加起来即为汉明距离
class Solution {
public:
int hammingDistance(int x, int y) {
int res = 0;
int i = x ^ y;
while(i)
{
i &= (i - 1);
res++;
}
return res;
}
};