15 lines
283 B
C++
15 lines
283 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int m;
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set<int> res;
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cin >> m;
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while (m--) {
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int x;
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cin >> x;
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res.insert(x);
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}
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cout << res.size() << endl;
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for (int x : res) cout << x << ' ';
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return 0;
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}
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