Submission #1609054

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Source Code Expand

#include <iostream>
using namespace std;

int main() {
	int N;
	int a[100001];
	int sum = 0;
	cin >> N;
	for (int i = 0; i < N; ++i) {
		cin >> a[i];
	}
	for (int i = 0; i < N; ++i) {
		if (i + 1 == a[a[i] - 1]) {
			++sum;
		}
	}
	cout << sum / 2 << endl;
}

Submission Info

Judge Result