Basics Exam 20 December 2014

Problem_5___Bit_Lock

using System;
using System.Linq;

namespace Problem_5___Bit_Lock
{
    class BitLock
    {
        static void Main(string[] args)
        {
            int[] sequence = Console
                .ReadLine()
                .Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
                .Select(item => int.Parse(item))
                .ToArray();

            while (true)
            {
                string input = Console.ReadLine().ToLower();

                if (input == "end")
                {
                    break;
                }

                string[] commands = input.Split(' ');
                int row;

                if (commands[0] == "check")
                {
                    string command = commands[0];
                    int column = int.Parse(commands[1]);
                    CheckColumn(sequence, column);
                }
                else if (int.TryParse(commands[0], out row))
                {
                    string direction = commands[1];
                    int rollsCount = int.Parse(commands[2]);
                    RollNumber(sequence, row, direction, rollsCount);
                }
            }

            PrintArray(sequence);
            Console.WriteLine();
        }

        private static void PrintArray(int[] array)
        {
            for (int i = 0; i < array.Length; i++)
            {
                Console.Write("{0} ", array[i]);
            }
        }

        private static void RollNumber(int[] sequence, int row, string direction, int rollsCount)
        {
            if (direction == "right")
            {
                for (int i = 0; i < rollsCount; i++)
                {
                    int bit = sequence[row] & 1;
                    sequence[row] >>= 1;
                    sequence[row] |= (bit << 11);
                }
            }
            else if (direction == "left")
            {
                for (int i = 0; i < rollsCount; i++)
                {
                    int bit = (sequence[row] >> 11) & 1;
                    sequence[row] |= (1 << 11);
                    sequence[row] ^= (1 << 11);
                    sequence[row] <<= 1;
                    sequence[row] |= bit;
                }                
            }
        }

        private static void CheckColumn(int[] array, int col)
        {
            int bitsCount = 0;

            for (int row = 0; row < array.Length; row++)
            {
                if (((array[row] >> col) & 1) == 1)
                {
                    bitsCount++;
                }
            }

            Console.WriteLine(bitsCount);
        }
    }
}