Submission #935026

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Source Code Expand

#include<iostream>
using namespace std;

int main() {
	int n, a[100000], sum = 0;
	cin >> n;
	for (int i = 0; i < n; i++)
		cin >> a[i];
	for (int i = 0; i < n; i++) {
		if (a[a[i] - 1] != i + 1) continue;
		sum++;
	}
	cout << sum / 2 << endl;
}

Submission Info

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