30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    unsigned int count = 0;
    if(n == -1){
        return 32;
    }else{
        for(int i=0;i<32;i++)
        {
            if(n & (1U << i)){
                count++;
            }
        }
    }
    return count;
}

int main() {
    int n;
    scanf("%d", &n);
    printf("%d", countSetBits(n));
    return 0;
}