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- #include <iostream>
- using namespace std;
- int main()
- {
- int N, v[1001], grupe = 0;
- cin >> N;
- for (int i = 1; i <= N; i++)
- cin >> v[i];
- for (int i = 1; i <= N; i++)
- for (int j = 1; j <= N; j++)
- {
- if (v[i] == j && v[j] == i && v[i] > -1 && v[j] > -1)
- {
- grupe++;
- v[i] = -1;
- v[j] = -1;
- break;
- }
- }
- cout << grupe;
- }
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