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