Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    // int count=0;
    // while(n>>1){
    //     count++;
    //     n = n & (n-1);
    // }
    // return count;
    return __builtin_popcount(n);
}

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

Solving Approach