func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, c = 0;     cin >> n;     int a[n], b[n];     map<int, int> mp;     for (int i = 1; i <= 1001; i++) {       mp[i] = 0;     }     for (int i = 0; i < n; i++) {       cin >> a[i];     }     for (int i = n - 1; i >= 0; i--) {       if (mp[a[i]] == 0) {         mp[a[i]] = 1;         b[c] = a[i];         c++;       }     }     reverse(b, b + c);     cout << c << endl;     for (int i = 0; i < c; i++) cout << b[i] <<    ;     cout << endl;     return 0;   }   