gistfile1.txt

#include <iostream>
#include <vector>

void cycle(int& numbvec, const int cyclebegin, int& summ, std::vector<int>& MainVec) {
    if (MainVec[numbvec] == cyclebegin) {
        summ = summ + 1;
        MainVec[numbvec] = 0;
    } else {
        cycle(MainVec[numbvec], cyclebegin, summ, MainVec);
        MainVec[numbvec] = 0;
    }
}

int main() {
    int n, summ = 0;
    std::cin >> n;
    std::vector<int> Vec;
    for (int i = 0; i < n; i++) {
        int figure;
        std::cin >> figure;
        Vec.push_back(figure - 1);
    }
    for (int ii = 0; ii < n; ii++) {
        if ((Vec[ii] == ii) || (Vec[ii] == 0)) {
            continue;
        } else {
            cycle(Vec[ii], ii, summ, Vec);
        }
    }
    std::cout << summ << "\n" << std::endl << "\n" << std::endl << "\n";
    system("pause");
    return 0;
}