Submission #1674974

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Source Code Expand

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] a = new int[n];
		for(int i = 0 ; i < n ; i++) {
			a[i] = sc.nextInt();
		}
		int ans = 0;
		for(int i = 0 ; i < n ; i++) {
			if(i == a[a[i] - 1] - 1) {
				ans++;
			}
		}
		System.out.println(ans / 2);
	}
}

Submission Info

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