BAEKJOON 10451

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;

public class Main {
	static int ans;
	static int[] arr;
	public static void main(String[] args) throws Exception{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int T = Integer.parseInt(br.readLine());
		for (int t = 1; t <= T; t++) {
			int N = Integer.parseInt(br.readLine());
			arr = new int[N+1];
			for (int i = 1; i <=N; i++) {
				arr[i] = i;
			}
			StringTokenizer st = new StringTokenizer(br.readLine());
			ans = 0;
			for (int i = 1; i <=N; i++) {
				union(i,Integer.parseInt(st.nextToken()));
			}
			System.out.println(ans);
		}
	}
	static int find(int a) {
		if(a == arr[a])
			return a;
		return arr[a] = find(arr[a]);
	}
	
	static void union(int a, int b) {
		int ar = find(a);
		int br = find(b);
		if(ar < br)
			arr[br] = ar;
		else if (ar > br)
			arr[ar] = br;
		else
			ans++;
	}
}