using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var board = new char[][]

            {

                new char[]{'5','3','.','.','7','.','.','.','.'}

            ,   new char[]{'6','.','.','1','9','5','.','.','.'}

            ,   new char[]{'.','9','8','.','.','.','.','6','.'}

            ,   new char[]{'8','.','.','.','6','.','.','.','3'}

            ,   new char[]{'4','.','.','8','.','3','.','.','1'}

            ,   new char[]{'7','.','.','.','2','.','.','.','6'}

            ,   new char[]{'.','6','.','.','.','.','2','8','.'}

            ,   new char[]{'.','.','.','4','1','9','.','.','5'}

            ,   new char[]{'.','.','.','.','8','.','.','7','9'}

        };

        Console.WriteLine("Resultado: " + IsSudokuValid(board));

    }

    public static bool IsSudokuValid(char[][] board) 

    {

        var lines = new char[9][];

        var columns = new char[9][];

        var nines = new char[9][];

        var currentNine = 0;

        for (var i = 0; i < board.Length; i++) {

            lines[i] = new char[9]; 

            var l = new ArraySegment<char>(board[i]);

            for (var j = 0; j < board[i].Length; j++) {

                // Linhas

                lines[i][j] = board[i][j];

            }

            // Nines

            if (nines[currentNine] == null) 

                nines[currentNine] = new char[9];

            for (var j = 0; j < 2; j++) {

                var slicedLine = l.Slice(j * 3, 3);

                nines[currentNine] = slicedLine.ToArray();

            }

        }

        for (var i = 0; i < nines.Length; i++) {

        }

        Console.WriteLine(lines[0]);    

        Console.WriteLine(nines[0]);

        return true;

    }

}