[力扣] 算法 191 (C++)

class Solution {
public:
    int hammingWeight(uint32_t n) {
        n = ((n & 0xAAAAAAAA) >> 1) + (n & 0x55555555);
        n = ((n & 0xCCCCCCCC) >> 2) + (n & 0x33333333);
        n = ((n & 0xF0F0F0F0) >> 4) + (n & 0x0F0F0F0F);
        n = ((n & 0xFF00FF00) >> 8) + (n & 0x00FF00FF);
        n = ((n & 0xFFFF0000) >> 16) + (n & 0x0000FFFF);
        return n;
    }
};