Submission #5442520

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int N;
    cin >> N;

    int A[N + 1];
    for (int i = 1; i <= N; ++i) {
        cin >> A[i];
    }
    int count = 0;
    for (int i = 1; i <= N; ++i) {
        count += A[A[i]] == i;
    }

    cout << count / 2 << '\n';

    return 0;
}

Submission Info

Judge Result