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- #include <iostream>
- #include <vector>
- #include <set>
- using namespace std;
- int main()
- {
- int n;
- cin >> n;
- int x;
- vector<int> v;
- for (int i(0); i < n; ++i) {
- cin >> x;
- v.push_back(x);
- }
- vector<int> res;
- set<int> items;
- int sz1, sz2;
- for (int i(0); i < n; ++i) {
- int d = v[i];
- sz1 = items.size();
- items.insert(d);
- sz2 = items.size();
- if (sz2 > sz1) {
- res.push_back(d);
- }
- }
- for (int i(0); i < res.size(); ++i) {
- cout << res[i] << " ";
- }
- return 0;
- }
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