Submission #891785

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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() - 1;
        }
        int c = 0;
        for (int i = 0; i < n; i++) {
            if (a[a[i]] == i) {
                c++;
            }
        }
        System.out.println(c / 2);
    }
}

Submission Info

Judge Result