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- #include <iostream>
- #include<algorithm>
- #include <set>
- using namespace std;
- int main()
- {
- int n;
- cin>>n;
- set<int> s;
- for(int i = 0; i < n; i++) {
- int a;
- cin >> a;
- s.insert(a);
- }
- cout << s.size() << endl;
- return 0;
- }
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