Submission #2180063

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Source Code Expand

#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
using namespace std;
long long N;

int a[100001];
int main() {
	cin >> N; 
	for (int i = 1; i < N+1; ++i) {
		cin >> a[i];
	}
	int cnt = 0;
	for (int i = 1; i < N+1; ++i) {
		int temp = a[i];
		if (a[temp] == i) {
			cnt++;
			a[temp] = 0;
		}
	}
	cout << cnt << endl;
	return 0;
}

Submission Info

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