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