arrays #1 27/

//#1
            int[] arr = new int[10];
            int[] rev = new int[10];
            for (int i = 0; i < 10; i++)
            {
                int num = int.Parse(Console.ReadLine());
                arr[i] = num;
                rev[9 - i] = num;
            }
            for (int i = 0;  i < 10; i++)
                Console.Write("{0,-3}", arr[i]);
            Console.WriteLine();
            Console.WriteLine();
            for (int i = 0; i < 10; i++)
                Console.Write("{0,-3}", rev[i]);
        }
//#3
            int[] a = new int[8];
            for (int i = 0; i < a.Length; i++)
                a[i] = int.Parse(Console.ReadLine());
            int counter = 0;
            for (int i = 0; i < a.Length - 1; i++)
                if (a[i] > a[i + 1]) counter++;
            Console.WriteLine(counter);

//#4
            int[] a = new int[7];
            for (int i = 0; i < a.Length; i++)
                a[i] = int.Parse(Console.ReadLine());
            int counter = 0, counter2 = 0;
            double avg = 0;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] % 2 == 0)
                    counter++;
                else
                {
                    avg += a[i];
                    counter2++;
                }
            }
            avg /= (double)counter2;
            Console.WriteLine("even: {0}, average: {1}", counter, avg);

//#7
//solution by Amit Lazar
            int[] a = new int[5];
            for (int i = 0; i < a.Length; i++)
                a[i] = int.Parse(Console.ReadLine());
            bool different = true;
            int j = 0;
            while (j < a.Length - 1 && different == true)
            {
                if (a[j] != a[j + 1])
                    j++;
                else
                    different = false;
            }
            Console.WriteLine(different);
//#8
            int[] a = new int[10];
            Random rnd = new Random();
            for (int i = 0; i < a.Length; i++)
                a[i] = rnd.Next(4, 28);
            int times = 1, num = 0;
            for (int i = 1; i < a.Length; i++)
            {
                int lotime = 1;
                for (int j = 0; j < i; j++)
                    if (a[j] == a[i]) lotime++;
                if (lotime >= times)
                {
                    num = a[i];
                    times = lotime;
                }
                Console.Write("{0,-3}", a[i]);
            }
            Console.WriteLine();
            Console.WriteLine("times: {0}, num: {1}", times, num);
//#9
int[] a = new int[10];
            int[] b = new int[10];
            for (int i = 0; i < 10; i++)
                a[i] = int.Parse(Console.ReadLine());
            for (int i = 0; i < 10; i++)
                b[i] = int.Parse(Console.ReadLine());
            int[] d = new int[10];
            int k = 0;
            for (int i = 0; i < b.Length; i++)
            {
                for (int j = 0; j < a.Length; j++)
                {
                    if (a[i] == b[j])
                    {
                        d[k] = a[i];
                        k++;
                    }
                }
            }
            int[] c = new int[k];
            for (int i = 0; i < c.Length; i++)
                c[i] = d[i];
            for (int i = 0; i < c.Length; i++)
                Console.Write("{0, -3}", c[i]);

//#10
            int[] a = new int[10];
            for (int i = 0; i < a.Length; i++)
                a[i] = int.Parse(Console.ReadLine());
            double avg = 0;
            for (int i = 0; i < a.Length; i++)
                avg += a[i];
            avg /= (double)a.Length;
            Console.WriteLine(avg);
            for (int i = 0; i < a.Length; i++)
                Console.WriteLine((double)a[i] - avg);