using System;

​

public class Program

{

    public void spiral(int[, ] arr)

    {

        int left = 0;

        int top = 0;

        int right = arr.GetLength(1) - 1;

        int bottom = arr.GetLength(0) - 1;

        int count = 0;

        int dir = 0;

        int times = arr.Length;

        while (count < times)

        {

            if (dir == 0)

            {

                for (int i = left; i <= right; i++)

                {

                    Console.Write("{0},", arr[top, i]);

                    count++;

                }

​

                top++;

            }

            else if (dir == 1)

            {

                for (int i = top; i <= bottom; i++)

                {

                    Console.Write("{0},", arr[i, right]);

                    count++;

                }

​

                right--;

            }

            else if (dir == 2)

            {

                for (int i = right; i >= left; i--)

                {

                    Console.Write("{0},", arr[bottom, i]);

                    count++;

                }

​

                bottom--;

            }

            else

            {

                for (int i = bottom; i >= top; i--)

                {

                    Console.Write("{0},", arr[i, left]);

                    count++;

                }

​

                left++;

            }

​

            dir = ((dir + 1) % 4);

        }

    }

​

    public static void Main()

    {

        int[, ] arr2d = new int[, ]{{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};

        Program p = new Program();

        p.spiral(arr2d);

    }

}