---

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Введите количество элементов: ");
        int n = scanner.nextInt();

        int[] a = new int[n];

        for (int i = 0; i < n; i++) {
            System.out.print("Введите элемент: ");
            a[i] = scanner.nextInt();
        }

        int max = a[0];
        int secondMax = a[1];

        if (secondMax > max) {
            int temp = max;
            max = secondMax;
            secondMax = temp;
        }

        for (int i = 2; i < n; i++) {
            if (a[i] > max) {
                secondMax = max;
                max = a[i];
            } else if (a[i] > secondMax) {
                secondMax = a[i];
            }
        }

        System.out.println("Второй максимум: " + secondMax);
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Введите количество элементов: ");
        int n = scanner.nextInt();

        int[] a = new int[n];

        for (int i = 0; i < n; i++) {
            System.out.print("Введите элемент: ");
            a[i] = scanner.nextInt();
        }

        System.out.println("Уникальные элементы:");

        for (int i = 0; i < n; i++) {
            int count = 0;

            for (int j = 0; j < n; j++) {
                if (a[i] == a[j]) {
                    count++;
                }
            }

            if (count == 1) {
                System.out.print(a[i] + " ");
            }
        }
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Введите количество элементов: ");
        int n = scanner.nextInt();

        int[] a = new int[n];

        for (int i = 0; i < n; i++) {
            System.out.print("Введите элемент: ");
            a[i] = scanner.nextInt();
        }

        for (int i = 0; i < n - 1; i = i + 2) {
            int temp = a[i];
            a[i] = a[i + 1];
            a[i + 1] = temp;
        }

        System.out.println("Результат:");

        for (int i = 0; i < n; i++) {
            System.out.print(a[i] + " ");
        }
    }
}