using System;

​

public class Program

{

    public static bool IsExist(int[] arr, int n)

    {

        for (int i = 0; i < arr.Length; i++)

        {

            if (arr[i] == n)

            {

                return true;

            }

        }

        return false;

    }

​

    public static bool AllIncluded(int[] a, int[] b)

    {

        for (int i = 0; i < b.Length; i++)

        {

            if (IsExist(a, b[i]) == false)

            {

                return false;

            }

        }

        return true;

    }

​

    public static void Main()

    {

        int[] a = {18, 5, 9, 6, 8, 22, 13, 7};

        int[] b = {6, 5, 13};

        int[] c = {22, 23, 9, 18};

​

        Console.WriteLine(AllIncluded(a, b));

        Console.WriteLine(AllIncluded(a, c));

        Console.WriteLine(IsExist(a, 6));

        Console.WriteLine(IsExist(a, 23));

    }

}

​