Matrix

namespace Matrix
{
    using System;
    using System.Linq;
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Input(row, col)");
            var rowCol = Console.ReadLine()
                   .Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                   .Select(int.Parse)
                   .ToArray();
            int[][] matrix = new int[rowCol[0]][];
            int[][] maxMatrix = new int[3][];

            Console.WriteLine("Rows: "); // spaces
            for (int row = 0; row < rowCol[0]; row++)
            {
                matrix[row] = Console.ReadLine()
                    .Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                    .Select(int.Parse)
                    .ToArray();
            }
            for (int row = 0; row < 3; row++)
            {
                maxMatrix[row] = matrix[row].Take(3).ToArray();
            }
            for (int row = 0; row < rowCol[0] - 2; row++)
            {
                for (int col = 0; col < rowCol[1] - 2; col++)
                {
                    if (matrix[row].Skip(col).Take(3).Sum() +
                        matrix[row + 1].Skip(col).Take(3).Sum() +
                        matrix[row + 2].Skip(col).Take(3).Sum()
                        >
                        maxMatrix[0].Sum() +
                        maxMatrix[1].Sum() +
                        maxMatrix[2].Sum())
                    {
                        maxMatrix[0] = matrix[row].Skip(col).Take(3).ToArray();
                        maxMatrix[1] = matrix[row + 1].Skip(col).Take(3).ToArray();
                        maxMatrix[2] = matrix[row + 2].Skip(col).Take(3).ToArray();
                    }
                }
            }
            Console.WriteLine($"Sum = {maxMatrix[0].Sum() + maxMatrix[1].Sum() + maxMatrix[2].Sum()}");
            for (int row = 0; row < 3; row++)
            {
                Console.WriteLine(string.Join(" ", maxMatrix[row]));
            }
        }
    }
}