Submission #890739

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

signed main()
{
    //freopen("input.txt", "r", stdin);
    ios::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    int a[n];
    for(int i = 0; i < n; i++)
        cin >> a[i];
    int ans = 0;
    for(int i = 0; i < n; i++)
        ans += a[a[i] - 1] == i + 1;
    cout << ans / 2 << "\n";
    return 0;
}

Submission Info

Judge Result