SnakeMoves

using System;
using System.Collections.Generic;
using System.Linq;

namespace SnakeMoves
{
    class Program
    {
        static void Main(string[] args)
        {
            var matrixDimension = Console.ReadLine()
                                 .Split()
                                 .Select(int.Parse)
                                 .ToArray();

            int rows = matrixDimension[0];
            int cols = matrixDimension[1];

            var snakeMatrix = new char[rows, cols];

            string snake = Console.ReadLine();

            int counter = 0;

            for (int row = 0; row < snakeMatrix.GetLength(0); row++)
            {
                if (row % 2 == 0 )
                {
                    for (int col = 0; col < snakeMatrix.GetLength(1); col++)
                    {
                        snakeMatrix[row, col] = snake[counter++];

                        if (counter == snake.Length)
                        {
                            counter = 0;
                        }
                    } // for za koloni
                } // if za chetni koloni
                else
                {
                    for (int col = snakeMatrix.GetLength(1) - 1; col >= 0; col--)
                    {
                        snakeMatrix[row, col] = snake[counter++];

                        if (counter == snake.Length)
                        {
                            counter = 0;
                        }
                    }// for za koloni
                } // else za nechetni koloni
            }
            for (int row = 0; row < snakeMatrix.GetLength(0); row++)
            {
                for (int col = 0; col < snakeMatrix.GetLength(1); col++)
                {
                    Console.Write(snakeMatrix[row, col]);

                }
                Console.WriteLine();
            }

        }
    }
}