class Solution {
public:
    int hammingWeight(uint32_t n) {
        int cnt = 0 ;
        while(n){
            n&=n-1;
            cnt++;
        }
        return cnt;
    }
};

class Solution {
public:
    int hammingWeight(uint32_t n) {
        int cnt = 0 ;
        while(n){
            cnt+= n %2;
            n>>=1;
        }
        return cnt;
    }
};