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