正确代码

#include<bits/stdc++.h>
int main(){
  std::cout<<2;
}

#include <iostream>
using namespace std;
typedef long long ll;
const ll MOD = 1000000007;
ll qpow(ll base, ll exp){
    ll res = 1;
    while (exp > 0)
    {
        if (exp & 1)
            res = (__int128)res * base % MOD;
        base = (__int128)base * base % MOD;
        exp >>= 1;
    }
    return res;
}
int main(){
    ll N;
    cin >> N;
    ll ans = (N == 1) ? 2 : qpow(2, N - 1);
    cout << ans << endl;
    return 0;
}

是我太菜了吗？