func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     int a;     int count = 0;     cin >> n;     for (int i = 1; i <= n; i++) {       cin >> a;       if (a == 1) count += 1;     }     if (n != 1) {       if (count == (n - 1))         cout <<  YES  << endl;       else         cout <<  NO  << endl;     } else {       if (count == 1)         cout <<  YES  << endl;       else         cout <<  NO  << endl;     }     return 0;   }   