Submission #3730308

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Source Code Expand

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

int main() {
	int n; cin >> n;
	vector<int> a(n);
	for(int i=0;i<n;++i){
		cin >> a[i];
		--a[i];
	}
	
	int ans = 0;
	
	for(int i=0; i<n; ++i){
		if(a[i] > i && a[a[i]] == i){	
			++ans;
		}
	}
	
	cout << ans << endl;
	
	return 0;
}

Submission Info

Judge Result