30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
     int count = 0;

    while (n > 0) {
        count += (n & 1); // l&#7845;y bit cu&#7889;i
        n >>= 1;          // d&#7883;ch ph&#7843;i
    }

    return count;
}

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