30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int count=0;
    // for(int i=0;i<32;i++){
    //     if((n >> i) & 1){
    //         count++;
    //     }
    // }
    while (n > 0) {
        n &= (n - 1); // Clears the least significant set bit
        count++;
    }

    return count;
}

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