标签:pre blank wiki 异或 AMM div code ++ tween
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
< 2^31.
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.
将两个数的二进制进行比较,不同的计数加一,最后返回总数。
由于1&1 = 1,1&0 = 0,可以分别将x,y和1做与运算得到x,y的最后一位的值,再做异或运算,然后再将x,y右移一位。因为题里限定了x,y大小,所以只32次循环就够了。
class Solution { public: int hammingDistance(int x, int y) { int nums = 0; for (int i = 0; i < 32; i++){ if ((x & 1) ^ (y & 1)) nums++; x = x >> 1; y = y >> 1; } return nums; } };
LeetCode 461. Hamming Distance (C++)
标签:pre blank wiki 异或 AMM div code ++ tween
原文地址:https://www.cnblogs.com/silentteller/p/10705303.html