From 4331492fe02568b34e532c2bf310a1c85db91cc1 Mon Sep 17 00:00:00 2001
From: Ben Harris <ben@tilde.team>
Date: Thu, 5 Dec 2019 01:19:56 -0500
Subject: [PATCH] day 5

---
 Day5.cs        | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++
 aoc2019.csproj |  3 ++
 input/day5.in  |  1 +
 3 files changed, 78 insertions(+)
 create mode 100644 Day5.cs
 create mode 100644 input/day5.in

diff --git a/Day5.cs b/Day5.cs
new file mode 100644
index 0000000..3bbaa4c
--- /dev/null
+++ b/Day5.cs
@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace aoc2019
+{
+    internal class Day5 : Day
+    {
+        public override int DayNumber => 5;
+
+        private static readonly IEnumerable<int> tape =
+            File.ReadLines("input/day5.in").First().Split(',').Select(int.Parse);
+
+        private static int output;
+        public static void RunIntCode(List<int> v, int input)
+        {
+            var i = 0;
+            while (i < v.Count && v[i] != 99)
+            {
+                int Val(int mode, int val) =>
+                    mode != 0 ? val : v[val];
+
+                var mode1 = v[i] / 100 % 10;
+                var mode2 = v[i] / 1000;
+
+                switch (v[i] % 100)
+                {
+                    case 1:
+                        v[v[i + 3]] = Val(mode1, v[i + 1]) + Val(mode2, v[i + 2]);
+                        i += 4;
+                        break;
+                    case 2:
+                        v[v[i + 3]] = Val(mode1, v[i + 1]) * Val(mode2, v[i + 2]);
+                        i += 4;
+                        break;
+                    case 3:
+                        v[v[i + 1]] = input;
+                        i += 2;
+                        break;
+                    case 4:
+                        output = Val(mode1, v[i + 1]);
+                        i += 2;
+                        break;
+                    case 5:
+                        i = Val(mode1, v[i + 1]) == 0 ? i + 3 : Val(mode2, v[i + 2]);
+                        break;
+                    case 6:
+                        i = Val(mode1, v[i + 1]) != 0 ? i + 3 : Val(mode2, v[i + 2]);
+                        break;
+                    case 7:
+                        v[v[i + 3]] = Val(mode1, v[i + 1]) < Val(mode2, v[i + 2]) ? 1 : 0;
+                        i += 4;
+                        break;
+                    case 8:
+                        v[v[i + 3]] = Val(mode1, v[i + 1]) == Val(mode2, v[i + 2]) ? 1 : 0;
+                        i += 4;
+                        break;
+                }
+            }
+        }
+        public override string Part1()
+        {
+            RunIntCode(tape.ToList(), 1);
+            return $"{output}";
+        }
+
+        public override string Part2()
+        {
+            RunIntCode(tape.ToList(), 5);
+            return $"{output}";
+        }
+    }
+}
diff --git a/aoc2019.csproj b/aoc2019.csproj
index 1533700..78b1890 100644
--- a/aoc2019.csproj
+++ b/aoc2019.csproj
@@ -18,6 +18,9 @@
     <None Update="input\day4.in">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
+    <None Update="input\day5.in">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 
 </Project>
diff --git a/input/day5.in b/input/day5.in
new file mode 100644
index 0000000..4d8fafe
--- /dev/null
+++ b/input/day5.in
@@ -0,0 +1 @@
+3,225,1,225,6,6,1100,1,238,225,104,0,1002,114,46,224,1001,224,-736,224,4,224,1002,223,8,223,1001,224,3,224,1,223,224,223,1,166,195,224,1001,224,-137,224,4,224,102,8,223,223,101,5,224,224,1,223,224,223,1001,169,83,224,1001,224,-90,224,4,224,102,8,223,223,1001,224,2,224,1,224,223,223,101,44,117,224,101,-131,224,224,4,224,1002,223,8,223,101,5,224,224,1,224,223,223,1101,80,17,225,1101,56,51,225,1101,78,89,225,1102,48,16,225,1101,87,78,225,1102,34,33,224,101,-1122,224,224,4,224,1002,223,8,223,101,7,224,224,1,223,224,223,1101,66,53,224,101,-119,224,224,4,224,102,8,223,223,1001,224,5,224,1,223,224,223,1102,51,49,225,1101,7,15,225,2,110,106,224,1001,224,-4539,224,4,224,102,8,223,223,101,3,224,224,1,223,224,223,1102,88,78,225,102,78,101,224,101,-6240,224,224,4,224,1002,223,8,223,101,5,224,224,1,224,223,223,4,223,99,0,0,0,677,0,0,0,0,0,0,0,0,0,0,0,1105,0,99999,1105,227,247,1105,1,99999,1005,227,99999,1005,0,256,1105,1,99999,1106,227,99999,1106,0,265,1105,1,99999,1006,0,99999,1006,227,274,1105,1,99999,1105,1,280,1105,1,99999,1,225,225,225,1101,294,0,0,105,1,0,1105,1,99999,1106,0,300,1105,1,99999,1,225,225,225,1101,314,0,0,106,0,0,1105,1,99999,1107,226,677,224,102,2,223,223,1006,224,329,101,1,223,223,1108,226,677,224,1002,223,2,223,1005,224,344,101,1,223,223,8,226,677,224,102,2,223,223,1006,224,359,1001,223,1,223,1007,226,677,224,1002,223,2,223,1005,224,374,101,1,223,223,1008,677,677,224,1002,223,2,223,1005,224,389,1001,223,1,223,1108,677,226,224,1002,223,2,223,1006,224,404,1001,223,1,223,1007,226,226,224,1002,223,2,223,1005,224,419,1001,223,1,223,1107,677,226,224,1002,223,2,223,1006,224,434,101,1,223,223,108,677,677,224,1002,223,2,223,1005,224,449,1001,223,1,223,1107,677,677,224,102,2,223,223,1005,224,464,1001,223,1,223,108,226,226,224,1002,223,2,223,1006,224,479,1001,223,1,223,1008,226,226,224,102,2,223,223,1005,224,494,101,1,223,223,108,677,226,224,102,2,223,223,1005,224,509,1001,223,1,223,8,677,226,224,1002,223,2,223,1006,224,524,101,1,223,223,7,226,677,224,1002,223,2,223,1006,224,539,101,1,223,223,7,677,226,224,102,2,223,223,1006,224,554,1001,223,1,223,7,226,226,224,1002,223,2,223,1006,224,569,101,1,223,223,107,677,677,224,102,2,223,223,1006,224,584,101,1,223,223,1108,677,677,224,102,2,223,223,1006,224,599,1001,223,1,223,1008,677,226,224,1002,223,2,223,1005,224,614,1001,223,1,223,8,677,677,224,1002,223,2,223,1006,224,629,1001,223,1,223,107,226,677,224,1002,223,2,223,1006,224,644,101,1,223,223,1007,677,677,224,102,2,223,223,1006,224,659,101,1,223,223,107,226,226,224,1002,223,2,223,1006,224,674,1001,223,1,223,4,223,99,226
\ No newline at end of file