populate int[][]

[Randall Twede]

i am trying to solve Euler11. the first step is populating the array. i found a site where the person did this:
var grid = new[,]
{
{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},
};

i think it would be easier to create the array from a text file i create by copy/paste.
what are your thoughts?

[Greg Brannon]

Unless the problem requires the use of those exact numbers, I would suggest iterating through the array elements and filling them with random numbers 1 - 99.

[Randall Twede]

it IS those exact numbers.

i must admit this guy webpage
revealed to me the way to solve this one. i was clueless until i read it
i was going to process rows then columns then diagonals(i was kind of stumped thinking about that one).
then he showed me how easy it was

[Branden Bobo]

Take a look at the strings split method it returns a string arrayhere.
from there you could probally set up some loops and parse the string[] to create a int[][]

[Randall Twede]

yeah i know that. but you are implying i create a text file(i think). which is what i am inclined to do.

[Branden Bobo]

you wouldn't have to create text file. the String[] array could be stored in ram as variable.
I was thinking something like this...

public class TextToGrid {
    public static void main(String... args){
        //small version you would paste yours in.
        String strVersion="2 3 1 "
                        + "6 1 8 "
                        + "3 7 9 ";
       String[] strVerArray = strVersion.split(" ");
       int[][] grid= new int[3][3];
        for (int i = 0; i < strVerArray.length; i++) {
            grid[i/3][i%3] =Integer.parseInt( strVerArray[i]);
        }
        //should be omited...just to test that the logic is correct
        System.out.println(grid[0][0]+" "+grid[0][1]+" "+grid[0][2]+"\n");
        System.out.println(grid[1][0]+" "+grid[1][1]+" "+grid[1][2]+"\n");
        System.out.println(grid[2][0]+" "+grid[2][1]+" "+grid[2][2]+"\n");
    }
}

[Randall Twede]

so you would do it by hand? type in all those numbers? 20 * 20 = 400

[fred rosenberger]

I cut-n-pasted the given block of numbers to a text file, the parsed that. each line became an array, with the elements tokenized.

But like I said in your other thread...The purpose of these exercises (in my opinion) is in the computation of the answer...not the the mechanics of how you set things up. Whether you read from a file, hard-code them like your first example, enter them as command line params...it doesn't matter.

[Randall Twede]

I cut-n-pasted the given block of numbers to a text file, the parsed that.

that clinches it. i planned to do it that way. was just hoping there might be easier way.
i admit...i am lazy

[Junilu Lacar]

Since these are the actual values that need to be used and they won't change, I would probably just bite the bullet, copy paste the original matrix, then do a search-and-replace: " " with ", " and with regular expressions "^" (beginning of each line) with "{" and "$" (end of each line) with "}," and then make a few final tweaks. I'm lazy too and putting this in a text file and writing code to parse it seems like way too much work for me. YMMV