using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;

namespace UlamSpiral
{
    class Program
    {
        static long[,] spiralArray = new long[10,10];
        static char[] direction = new char []{ 'W', 'S', 'E', 'N' };
        static long arrDimension = spiralArray.GetUpperBound(0)+1;
        static long squaresToFillOnEachSide = 0;
        static long colIdx = arrDimension, rowIdx = 0;
        static long lastNumber = arrDimension * arrDimension;
   
        static void Main(string[] args)
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            while (arrDimension > 1)
            {
                squaresToFillOnEachSide = arrDimension - 1;
                for (int i = 0; i < 4; i++)
                {
                    for (int j = 0; j < squaresToFillOnEachSide; j++)
                    {
                        if (direction[i] == 'W') { colIdx -= 1; }
                        else if (direction[i] == 'S') { rowIdx += 1; }
                        else if (direction[i] == 'E') { colIdx += 1; }
                        else if (direction[i] == 'N') { rowIdx -= 1; }

                        spiralArray[rowIdx,colIdx]=lastNumber--;
                    }

                    if (direction[i] == 'W') {colIdx -= 1; rowIdx -= 1;}
                    else if (direction[i] == 'S') {rowIdx += 1; colIdx -= 1;}
                    else if (direction[i] == 'E') {colIdx += 1; rowIdx += 1;}

                }
                arrDimension -= 2;
            }

            sw.Stop();
            //>0 means the center box is not filled and is def on to the left
            //move towars west on the same row and place the last element
            if (arrDimension > 0 && lastNumber>0)
            {
                spiralArray[rowIdx, colIdx-1] = lastNumber--;
            }


            for (int i = 0; i <= spiralArray.GetUpperBound(0); i++)
            {
                for (int j = 0; j <= spiralArray.GetUpperBound(0); j++)
                {
                    Console.Write(spiralArray[i, j] + "  ");
                }
                Console.WriteLine();
            }
        Console.ReadLine();
        }
    }
}