func_code_string: #include <bits/stdc++.h>   using namespace std;   using ii = pair<int, int>;   using ll = long long int;   using vi = vector<int>;   using graph = vector<vi>;   const int INF = 0x3f3f3f3f;   const ll INFL = 0x3f3f3f3f3f3f3f3f;   const int MAXN = 200005;   int fq[4];   int main() {     int n, m, k;     string s;     cin >> n;     cin >> s;     for (auto c : s) {       int x = c -  0 ;       fq[x]++;     }     if (n == 1) {       cout << s <<   n ;     } else if (n == 2) {       if (fq[1] == 2) {         cout << 1 <<   n ;       } else {         cout << s <<   n ;       }     } else {       cout << 1;       while (fq[0]--) {         cout << 0;       }     }   }   