func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     string nonz;     int ans = 0;     string s =   ;     bool zr = false;     for (int i = 0; i < n; i++) {       string a;       cin >> a;       if (a ==  0 ) zr = true;       string x = a;       bool beauty = true;       int zero = 0, one = 0;       for (auto j : a) {         if (j ==  1 )           one++;         else if (j ==  0 )           zero++;         else {           beauty = false;           nonz = x;         }       }       if (one > 1) {         beauty = false;         nonz = x;       } else if (beauty) {         ans += zero;       }     }     if (!zr) {       if (nonz.size())         cout << nonz;       else         cout << 1;       for (int i = 0; i < ans; i++) {         cout << 0;       }       cout << endl;     } else {       cout << 0 << endl;     }   }   