Jedi Galaxy

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

namespace Jedi_Galaxy
{
    public class StartUp
    {
        public static void Main(string[] args)
        {
            var dimensions = Console.ReadLine().Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries)
                .Select(int.Parse).ToArray();

            var galaxy = CreateGalaxy(dimensions);
            var input = Console.ReadLine();
            var collectedStars = 0L;

            while (!input.Equals("Let the Force be with you"))
            {
                var coordinatesIvo = input.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries)
                    .Select(int.Parse).ToArray();

                input = Console.ReadLine();

                var coordinatesEvil = input.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries)
                    .Select(int.Parse).ToArray();
                DestroyStars(galaxy, coordinatesEvil);
                collectedStars += CollectStars(galaxy, coordinatesIvo);

                input = Console.ReadLine();
            }
            Console.WriteLine(collectedStars);

        }

        private static long CollectStars(int[][] galaxy, int[] coordinatesIvo)
        {
            var collected = 0L;
            var ivoRow = coordinatesIvo[0];
            var ivoCol = coordinatesIvo[1];

            for (int i = ivoRow, j = ivoCol; i >= 0 && j < galaxy[0].Length; i--, j++)
            {
                if (i < galaxy.Length && j >= 0)
                {
                    collected += galaxy[i][j];
                }
            }
            return collected;

        }

        private static void DestroyStars(int[][] galaxy, int[] coordinates)
        {
            var evilStartRow = coordinates[0];
            var evilStartCol = coordinates[1];

            for (int i = evilStartRow, j = evilStartCol; i >= 0 && j >= 0; i--, j--)
            {
                if (i < galaxy.Length && j < galaxy[0].Length)
                {
                    galaxy[i][j] = 0;
                }
            }
        }

        private static int[][] CreateGalaxy(int[] dimensions)
        {
            var row = dimensions[0];
            var col = dimensions[1];
            var matrix = new int[row][];

            for (var i = 0; i < row; i++)
            {
                matrix[i] = new int[col];

                for (var j = 0; j < col; j++)
                {
                    matrix[i][j] = i * col + j;
                }
            }
            return matrix;
        }
    }
}