func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     vector<int> v;     int c;     for (int i = 0; i < n; i++) {       cin >> c;       v.push_back(c);     }     if (n == 1) {       if (v[0] == 1) {         cout <<  YES ;         return 0;       }     }     sort(v.begin(), v.end());     if (v[0] == 0 && v[1] == 1) {       cout <<  YES ;     } else {       cout <<  NO ;     }     return 0;   }   