func_code_string: #include <bits/stdc++.h>   using namespace std;   const int _5 = 100005, _6 = 1000006;   int n, a[1001], b[1001];   vector<int> v;   int main() {     scanf( %d , &n);     for (int i = 0, b; i < n; ++i) cin >> a[i];     for (int i = n - 1; i >= 0; --i) {       if (!b[a[i]]) {         b[a[i]] = 1;         v.push_back(a[i]);       }     }     cout << v.size() << endl;     for (int i = v.size() - 1; i >= 0; --i) {       cout << v[i] <<    ;     }     return 0;   }   