func_code_string: #include <bits/stdc++.h>   const int md = 1e9 + 7;   const long long hs = 199;   using namespace std;   int n, x;   set<int> a;   int main() {     ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);     cin >> n;     for (int i = 1; i <= n; i++) a.insert(i);     cout <<  1  ;     while (--n) {       cin >> x;       a.erase(x);       auto it = a.end();       it--;       cout << 1 + *it - n <<   n ;     }     cout << 1 <<   n ;   }   