Adv2016/D12.1/Program.cs

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

namespace D12._1
{
    public class Program
    {
        static void Main(string[] args)
        {
            int[] Registers = new int[5] { 0, 0, 0, 0, 0 };

            Work(args, Registers);

            Console.WriteLine($"The answer is : {Registers[0]}");
        }

        public static void Work(string[] args, int[] Registers)
        {
            var Ops = new Dictionary<string, Action<bool, int, int>>()
            {
                { "cpy", (i, a, b) => { Registers[b] = i ? Registers[a] : a; } },
                { "inc", (i, a, b) => { Registers[a]++; } },
                { "dec", (i, a, b) => { Registers[a]--; } },
                { "jnz", (i, a, b) => { Registers[4] += (i ? Registers[a] : a) != 0 ? b - 1 : 0; } }
            };

            List<string[]> instr = File.ReadAllText(args[0]).Split(new string[] { "\r\n", "\n" }, StringSplitOptions.RemoveEmptyEntries)
                .Select(n => n.Split(" ")).ToList();

            for (; Registers[4] < instr.Count; Registers[4]++)
            {
                var i = instr[Registers[4]];

                ParseLine(i, out int valuea, out int valueb, out bool isreg);

                Ops[i[0]](isreg, valuea, valueb);
            }
        }

        private static void ParseLine(string[] i, out int valuea, out int valueb, out bool isreg)
        {
            valuea = 0;
            valueb = 0;
            isreg = false;
            if (i[1][0] >= 'a')
            {
                valuea = i[1][0] - 'a';
                isreg = true;
            }
            else valuea = int.Parse(i[1]);
            if (i.Length == 3)
            {
                if (i[2][0] >= 'a') valueb = i[2][0] - 'a';
                else valueb = int.Parse(i[2]);
            }
        }
    }
}