Problem 19. Spiral Matrix

using System;

class SpiralMatrix
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int[,] spiral = new int[n, n];
        int count = 1;
        int row = 0;
        int col = -1;

        for (int k = 0; k <= n / 2; k++)
        {
            //right
            for (col = col + 1; col <= n - 1 - k; col++)
            {
                spiral[row, col] = count;
                if (count == n * n)
                    goto print;
                count++;
            }
            col--;
            //down
            for (row = row + 1; row <= n - 1 - k; row++)
            {
                spiral[row, col] = count;
                if (count == n * n)
                    goto print;
                count++;
            }
            row--;
            //left
            for (col = col - 1; col >= k; col--)
            {
                spiral[row, col] = count;
                if (count == n * n)
                    goto print;
                count++;
            }
            col++;
            //up
            for (row = row - 1; row > k; row--)
            {
                spiral[row, col] = count;
                if (count == n * n)
                    goto print;
                count++;
            }
            row++;
        }
  print:
        for (row = 0; row < n; row++)
        {
            for (col = 0; col < n; col++)
            {
                Console.Write("{0,4}", spiral[row, col]);
            }
            Console.WriteLine();
        }
    }
}