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