Kortit

import java.util.*;
 
public class kortit {
 
	public static void main(String[] args) {
 
		Scanner input = new Scanner(System.in);
 
		int tests = input.nextInt();
 
		int[] ans = new int[tests];
		int card = 0;
 
		for (int k = 0; k < tests; k++) {
			int qty = input.nextInt() / 2;
			int[] a = new int[qty];
 
			for (int i = 0; i < qty; i++) {
				a[i] = input.nextInt();
			}
			Arrays.sort(a);
 
			int winners = 0;
			for (int i = 0; i < qty; i++) {
				card = a[i];
 
				if (card > (winners + i + 1)) {
					winners++;
				}
			}
			ans[k] = winners;
		}
 
 
		for (int i = 0; i < tests; i++) {
 
			System.out.println(ans[i]);
		}
		input.close(); 
    }
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED