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@@ -0,0 +1,84 @@
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+using System;
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+using System.Collections.Generic;
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+using System.IO;
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+
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+namespace D23._1
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+{
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+ public class Machine
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+ {
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+ public static uint[] Registers { get; set; }
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+
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+ public Machine() => Registers = new uint[2] { 0, 0 };
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+
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+ static public int I { get; set; }
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+
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+ public readonly Dictionary<string, Action<int, int>> OpCodes = new Dictionary<string, Action<int, int>>
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+ {
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+ { "hlf", (r, o) => Registers[r] /= 2 },
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+ { "tpl", (r, o) => Registers[r] *= 3 },
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+ { "inc", (r, o) => Registers[r] += 1 },
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+ { "jmp", (o, _) => I += o - 1 },
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+ { "jie", (r, o) => { if (Registers[r] % 2 == 0) I += o - 1; } },
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+ { "jio", (r, o) => { if (Registers[r] == 1) I += o - 1; } },
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+ };
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+
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+ public List<(string, int, int)> Code = new List<(string, int, int)>();
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+
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+ public void AddLine(string op, int p1, int p2) => Code.Add((op, p1, p2));
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+
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+ public bool Exec()
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+ {
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+ (string op, int p1, int p2) = Code[I];
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+ OpCodes[op](p1, p2);
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+ I++;
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+
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+ return I < Code.Count;
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+ }
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+ }
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+
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+ class Program
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+ {
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+ static void Main(string[] args)
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+ {
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+ if (args.Length < 1) throw new ArgumentException();
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+ if (File.Exists(args[0]) == false) throw new FileNotFoundException();
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+
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+ var pc = ParseFile(args);
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+
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+ while (pc.Exec()) ;
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+
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+ Console.WriteLine($"Part 1 answer is {Machine.Registers[1]}");
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+
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+ Machine.Registers = new uint[] { 1, 0 };
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+ Machine.I = 0;
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+
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+ while (pc.Exec()) ;
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+
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+ Console.WriteLine($"Part 2 answer is {Machine.Registers[1]}");
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+ }
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+
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+ private static Machine ParseFile(string[] args)
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+ {
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+ var pc = new Machine();
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+ using (var file = File.OpenText(args[0]))
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+ {
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+ while (true)
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+ {
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+ var line = file.ReadLine();
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+ if (line == null) break;
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+
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+ var lr = line.Split(" ", 2);
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+ var op = lr[0];
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+ var vlr = lr[1].Split(", ");
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+
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+ int p1 = vlr[0] == "a" ? 0 : (vlr[0] == "b" ? 1 : int.Parse(vlr[0]));
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+ int p2 = vlr.Length > 1 ? int.Parse(vlr[1]) : 0;
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+
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+ pc.AddLine(op, p1, p2);
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+ }
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+ }
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+
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+ return pc;
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+ }
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+ }
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+}
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bastien.monsarrat