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- #include <iostream>
- #include <algorithm>
- #include <vector>
- #include <iterator>
- using namespace std;
- int main() {
- int n;
- cin >> n;
- if (n == 0) {
- return 0;
- }
- vector<int> v(n);
- for (int i = 0; i < n; ++i) {
- cin >> v[i];
- }
- vector<int> res;
- set<int> got;
- for (int i = n - 1; -1 < i; --i) {
- auto it = got.find(v[i])
- if (r == res.end()) {
- res.push_back(v[i]);
- got.insert(v[i]);
- }
- }
- cout << res.size() << "\n";
- for (int i = res.size() - 1; i > -1; --i) {
- cout << res[i] << " ";
- }
- }
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