Day 7 - Part 1

Advent.csproj.DotSettings

@@ -4,4 +4,5 @@
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day3/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day4/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day5/@EntryIndexedValue">True</s:Boolean>
-	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day6/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day6/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day7/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

Day7/Day7.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Advent
+{
+    public static class Day7
+    {
+        public static void Execute()
+        {
+            var program = "3,8,1001,8,10,8,105,1,0,0,21,34,43,64,85,98,179,260,341,422,99999,3,9,1001,9,3,9,102,3,9,9,4,9,99,3,9,102,5,9,9,4,9,99,3,9,1001,9,2,9,1002,9,4,9,1001,9,3,9,1002,9,4,9,4,9,99,3,9,1001,9,3,9,102,3,9,9,101,4,9,9,102,3,9,9,4,9,99,3,9,101,2,9,9,1002,9,3,9,4,9,99,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,1001,9,1,9,4,9,3,9,101,2,9,9,4,9,3,9,1001,9,2,9,4,9,99,3,9,101,1,9,9,4,9,3,9,102,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,99,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,101,1,9,9,4,9,99,3,9,101,1,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,1002,9,2,9,4,9,99,3,9,101,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,102,2,9,9,4,9,99";
+
+            var phaseList = GetPhaseList();
+
+            int? max = 0;
+
+            var amp = new IntcodeComputer();
+
+            foreach (var phases in phaseList)
+            {
+                var output = amp.Execute(new[] { phases[0], 0 }, program);
+                output = amp.Execute(new[] { phases[1], output.GetValueOrDefault(0) }, program);
+                output = amp.Execute(new[] { phases[2], output.GetValueOrDefault(0) }, program);
+                output = amp.Execute(new[] { phases[3], output.GetValueOrDefault(0) }, program);
+                output = amp.Execute(new[] { phases[4], output.GetValueOrDefault(0) }, program);
+
+                if (output > max)
+                    max = output;
+            }
+
+            Console.WriteLine(max);
+        }
+
+        private static IEnumerable<int[]> GetPhaseList()
+        {
+            // This is a stupid brute force way to do it but I'm lazy and it is fast so good enough
+
+            var phaseList = new List<int[]>();
+
+            for (var i = 0; i <= 99999; i++)
+            {
+                var phases = i.ToString("00000").ToCharArray().Select(c => int.Parse(c.ToString())).ToArray();
+
+                if (phases.All(p => p <= 4) && phases.Distinct().Count() == 5)
+                    phaseList.Add(phases);
+            }
+
+            return phaseList;
+        }
+    }
+}

IntcodeComputer.cs

@@ -0,0 +1,140 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Advent
+{
+    public class IntcodeComputer
+    {
+        private enum ParameterMode
+        {
+            Position,
+            Immediate
+        }
+
+        private static int GetValue(IReadOnlyList<int> codes, int parameter, ParameterMode mode)
+        {
+            return mode == ParameterMode.Immediate ? parameter : codes[parameter];
+        }
+
+        public int? Execute(int[] inputs, string commands)
+        {
+            var codes = commands.Split(',').Select(int.Parse).ToArray();
+
+            var position = 0;
+            var done = false;
+            var inputIndex = 0;
+            int? output = null;
+
+            while (!done)
+            {
+                var (mode1, mode2, mode3, opCode) = ParseOpCode(codes[position]);
+
+                switch (opCode)
+                {
+                    case 1:
+                        codes[codes[position + 3]] = GetValue(codes, codes[position + 1], mode1) + GetValue(codes, codes[position + 2], mode2);
+
+                        position += 4;
+
+                        break;
+
+                    case 2:
+                        codes[codes[position + 3]] = GetValue(codes, codes[position + 1], mode1) * GetValue(codes, codes[position + 2], mode2);
+
+                        position += 4;
+
+                        break;
+
+                    case 3:
+                        codes[codes[position + 1]] = inputs[inputIndex++];
+
+                        position += 2;
+
+                        break;
+
+                    case 4:
+                        output = GetValue(codes, codes[position + 1], ParameterMode.Position);
+
+                        position += 2;
+
+                        break;
+
+                    case 5:
+                        {
+                            var value = GetValue(codes, codes[position + 1], mode1);
+
+                            if (value != 0)
+                                position = GetValue(codes, codes[position + 2], mode2);
+                            else
+                                position += 3;
+                        }
+
+                        break;
+
+                    case 6:
+                        {
+                            var value = GetValue(codes, codes[position + 1], mode1);
+
+                            if (value == 0)
+                                position = GetValue(codes, codes[position + 2], mode2);
+                            else
+                                position += 3;
+                        }
+
+                        break;
+
+                    case 7:
+                        {
+                            var value1 = GetValue(codes, codes[position + 1], mode1);
+                            var value2 = GetValue(codes, codes[position + 2], mode2);
+
+                            if (value1 < value2)
+                                codes[codes[position + 3]] = 1;
+                            else
+                                codes[codes[position + 3]] = 0;
+
+                            position += 4;
+                        }
+
+                        break;
+
+                    case 8:
+                        {
+                            var value1 = GetValue(codes, codes[position + 1], mode1);
+                            var value2 = GetValue(codes, codes[position + 2], mode2);
+
+                            if (value1 == value2)
+                                codes[codes[position + 3]] = 1;
+                            else
+                                codes[codes[position + 3]] = 0;
+
+                            position += 4;
+                        }
+
+                        break;
+
+                    case 99:
+                        done = true;
+
+                        break;
+                }
+            }
+
+            return output;
+        }
+
+        private static (ParameterMode mode1, ParameterMode mode2, ParameterMode mode3, int opCode) ParseOpCode(int fullOpCode)
+        {
+            var codeString = fullOpCode.ToString("00000").ToCharArray();
+
+            var mode1 = Enum.Parse<ParameterMode>(codeString[2].ToString());
+            var mode2 = Enum.Parse<ParameterMode>(codeString[1].ToString());
+            var mode3 = Enum.Parse<ParameterMode>(codeString[0].ToString());
+
+            var opCode = int.Parse(codeString[3].ToString() + codeString[4]);
+
+            return (mode1, mode2, mode3, opCode);
+        }
+    }
+}

Program.cs

@@ -9,7 +9,8 @@
             //Day3.Execute();
             //Day4.Execute();
             //Day5.Execute();
-            Day6.Execute();
+            //Day6.Execute();
+            Day7.Execute();
         }
     }
 }