func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, i, s = 0, s2 = 0;     cin >> n;     char a[n];     cin >> a;     for (i = 0; i < n; i++) {       if (a[i] ==  0 )         s++;       else         s2++;     }     if (s2 > 0) cout <<  1 ;     while (s--) cout <<  0 ;     return 0;   }   