JediGalaxy

namespace JediGalaxy
{
    using System;
    using System.Linq;

    public class JediGalaxy
    {
        public static void Main()
        {
            long ivoStarValue = 0;
            int[] matrixDimentions = Console.ReadLine().Split().Select(int.Parse).ToArray();
            int[,] galaxy = new int[matrixDimentions[0], matrixDimentions[1]];

            FillMatrix(galaxy);

            string ivoCoordinates = Console.ReadLine();

            while (ivoCoordinates != "Let the Force be with you")
            {
                string evilCoordinates = Console.ReadLine();
                int[] ivoParsedCoordinates = ivoCoordinates.Split().Select(int.Parse).ToArray();
                int[] evilParsedCoordinates = evilCoordinates.Split().Select(int.Parse).ToArray();

                int currentIvoRow = ivoParsedCoordinates[0];
                int currentIvoColumn = ivoParsedCoordinates[1];

                int currentEvilRow = evilParsedCoordinates[0];
                int currentEvilColumn = evilParsedCoordinates[1];

                while (currentEvilRow >= 0 && currentEvilColumn >= 0)
                {
                    if (isInMatrix(galaxy, currentEvilRow, currentEvilColumn))
                    {
                        galaxy[currentEvilRow, currentEvilColumn] = 0;
                    }

                    currentEvilRow--;
                    currentEvilColumn--;
                }

                while (currentIvoRow >= 0 && currentIvoColumn<galaxy.GetLength(1))
                {
                    if (isInMatrix(galaxy, currentIvoRow, currentIvoColumn))
                    {
                        ivoStarValue += galaxy[currentIvoRow, currentIvoColumn];
                    }

                    currentIvoRow--;
                    currentIvoColumn++;
                }

                ivoCoordinates = Console.ReadLine();
            }

            Console.WriteLine(ivoStarValue);
        }

        private static bool isInMatrix(int[,] galaxy, int givenRow, int givenColumn)
        {
            bool result = givenRow >= 0
                && givenRow < galaxy.GetLength(0)
                && givenColumn >= 0
                && givenColumn < galaxy.GetLength(1);

            return result;
        }

        private static void FillMatrix(int[,] galaxy)
        {
            int currentCount = 0;

            for (int i = 0; i < galaxy.GetLength(0); i++)
            {
                for (int j = 0; j < galaxy.GetLength(1); j++)
                {
                    galaxy[i, j] = currentCount;
                    currentCount++;
                }
            }
        }
    }
}