Submission #891655

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

const int MAX = 100005;

int N;
int A[MAX];


int main(int argc, char* argv[]) {
    cin >> N;

    for (int i = 0; i < N; ++i) {
        cin >> A[i];

        A[i] = A[i] - 1;
    }

    int n = 0;

    for (int i = 0; i < N; ++i) {
        if (A[A[i]] == i) {
            n++;
        }
    }

    n = n / 2;

    cout << n << endl;

    return 0;
}

Submission Info

Judge Result