Project Euler Problem 11, C#

Project Euler Problem 11

//Rextester.Program.Main is the entry point for your code. Don't change it
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        
        static string number_string = @"
08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08
49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00
81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65
52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91
22 31 16 71 51 67 63 89 41 92 36 54 22 40 40 28 66 33 13 80
24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50
32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70
67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21
24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72
21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95
78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92
16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57
86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58
19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40
04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66
88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69
04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36
20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16
20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54
01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48";

static int span = 4;
        
        public static void Main(string[] args)
        {
            
            int max_row = -1, max_column = -1, max_row_step = -2, max_column_step = 2, max_product = -1;
            
            string[] row_strings = Regex.Split(number_string, "\r\n");
            row_strings = row_strings.Skip(1).ToArray(); 
            
            int number_of_rows = row_strings.Length;
            int number_of_columns = row_strings[0].Split(' ').Length;
            int max_row_index = number_of_rows -1;
            int max_column_index = number_of_columns - 1;
            
            int [][] numbers = new int[number_of_rows][];
            for (int row_index = 0; row_index <= max_row_index; row_index++)
            {
                numbers[row_index] = row_strings[row_index].Split(' ').Select(int.Parse).ToArray();
            }
            
            for (int starting_row = 0; starting_row <= max_row_index; starting_row++)
            {
                for (int starting_column = 0; starting_column <= max_column_index; starting_column++)
                {
                    for (int row_step = -1; row_step <= 1; row_step++) 
                    {
                        for (int column_step = row_step; column_step <= 1; column_step++)
                        {
                            if (row_step == 0 && column_step == 0) 
                            {
                                continue;
                            } else {
                                
                                int ending_row = starting_row + row_step * (span - 1);
                                int ending_column = starting_column + column_step * (span - 1);
                                
                                if (ending_row < 0 || ending_row > max_row_index || ending_column < 0 || ending_column > max_column_index)
                                {
                                    continue;
                                }
                            }
                                
                             int row_index, column_index, product = 1;
                                
                             for (int i = 0; i <= (span-1); i++)
                             {
                                 row_index = starting_row + i * row_step;
                                 column_index = starting_column + i * column_step;
                                 product *= numbers[row_index][column_index];
                             }
                                
                             if (product > max_product) 
                             {
                                 max_row = starting_row;
                                 max_column = starting_column;
                                 max_row_step = row_step;
                                 max_column_step = column_step;
                                 max_product = product;
                             }
                        }
                    }
                }
            }
            
            Console.WriteLine("{0}, {1}, {2}, {3}, {4}", max_row, max_column, max_row_step, max_column_step, max_product);
        }
    }
}


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