func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int i, n, flag = 0;     cin >> n;     int a[n];     for (i = 0; i < n; i++) {       cin >> a[i];       if (a[i] == 1) flag = 1;     }     if (flag)       cout <<  -1  << endl;     else       cout <<  1  << endl;     return 0;   }   