func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAX_N = 1e5 + 10;   int f[MAX_N], g[MAX_N], h[MAX_N], pos[MAX_N];   vector<int> adj[MAX_N];   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n;     cin >> n;     int m = 0;     for (int i = 1; i <= n; i++) {       cin >> f[i];       if (adj[f[i]].empty()) {         m++;         h[m] = f[i];         pos[f[i]] = m;       }       adj[f[i]].push_back(i);     }     for (int i = 1; i <= n; i++) {       for (int j = 0; j < adj[i].size(); j++) {         if (g[adj[i][j]] != 0) {           cout <<  -1 n ;           return 0;         }         g[adj[i][j]] = pos[i];       }     }     for (int i = 1; i <= n; i++) {       if (!g[i]) {         cout <<  -1 n ;         return 0;       }     }     for (int i = 1; i <= m; i++) {       if (g[h[i]] != i) {         cout <<  -1 n ;         return 0;       }     }     cout << m <<   n ;     for (int i = 1; i <= n; i++) {       cout << g[i];       if (i < n) cout <<    ;     }     cout <<   n ;     for (int i = 1; i <= m; i++) {       cout << h[i];       if (i < m) cout <<    ;     }     cout <<   n ;   }   