Educational Codeforces Round 69 about arts HOT 2 OPEN

public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    int t = sc.nextInt();
    for (int i = 0; i < t; i++) {
        int n = sc.nextInt();

        int arrays[] = new int[n];
        for (int j = 0; j < n; j++) {
            arrays[j] = sc.nextInt();

        }
        Arrays.sort(arrays);
        int value = n - 2 < arrays[arrays.length - 2] - 1 ? n - 2 : arrays[arrays.length - 2] - 1;
        System.out.println(value < 0 ? 0 : value);

    }
}