Function countBit_fast

CPP/bitmasking/count_bits.cpp:17–24

    return count;
}
int countBit_fast(int n){
    int ans=0;
    while(n>0){
        n=n&(n-1);
        ans++;
    }
    return ans;
}
int main(){
    cin.tie(0)->sync_with_stdio(0);
    int n;