Adv2016/D23.1/Program.cs

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

namespace D23._1
{
    public class Program
    {
        static void Main(string[] args)
        {
            int[] Registers = new int[5] {7, 0, 0, 0, 0 };

            Work(args, Registers);

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

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

            var Ops = new Dictionary<string, Action<bool, bool, int, int>>()
            {
                { "cpy", (ia, ib, a, b) => {
                    if (ib == false) return;
                    Registers[b] = ia ? Registers[a] : a; }
                },
                { "inc", (ia, ib, a, b) => {
                    if (ia == false) return;
                    Registers[a]++; }
                },
                { "dec", (ia, ib, a, b) => {
                    if (ia == false) return;
                    Registers[a]--;
                } },
                { "jnz", (ia, ib, a, b) => { Registers[4] += (ia ? Registers[a] : a) != 0 ? (ib ? Registers[b] : b) - 1 : 0; } },
                { "tgl", (ia, ib, a, b) => {
                    var ii = (ia ? Registers[a] : a) + Registers[4];
                    if (ii >= instr.Count) return;

                    var ins = instr[ii];

                    if (ins.Length == 2)
                        ins[0] = ins[0] == "inc" ? "dec" : "inc";
                    else
                        ins[0] = ins[0] == "jnz" ? "cpy" : "jnz";

                    instr[ii] = ins;
                } }
            };



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

                ParseLine(i, out int valuea, out int valueb, out bool isrega, out bool isregb);

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

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

            if (i.Length == 3)
            {
                if (i[2][0] >= 'a')
                {
                    valueb = i[2][0] - 'a';
                    isregb = true;
                }
                else valueb = int.Parse(i[2]);
            }
        }
    }
}