From 0cda2f940607bb4a9f94c730c798fd695f93f504 Mon Sep 17 00:00:00 2001
From: Parnic <github@parnic.com>
Date: Fri, 10 Dec 2021 13:51:44 -0600
Subject: [PATCH] Equivalent day 1 in C#

Again, purely for curiosity/performance comparison reasons
---
 advent-of-code-2021.csproj |  3 ++
 src/01.cs                  | 70 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+)
 create mode 100644 src/01.cs

diff --git a/advent-of-code-2021.csproj b/advent-of-code-2021.csproj
index a1b53cc..6a8a541 100644
--- a/advent-of-code-2021.csproj
+++ b/advent-of-code-2021.csproj
@@ -21,6 +21,9 @@
 	</PropertyGroup>
 
 	<ItemGroup>
+	  <None Update="inputs\01.txt">
+	    <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+	  </None>
 	  <None Update="inputs\02.txt">
 	    <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
 	  </None>
diff --git a/src/01.cs b/src/01.cs
new file mode 100644
index 0000000..b25ac64
--- /dev/null
+++ b/src/01.cs
@@ -0,0 +1,70 @@
+namespace aoc2021
+{
+    internal class Day01
+    {
+        internal static void Go()
+        {
+            Logger.Log("Day 1");
+            Logger.Log("-----");
+            var lines = File.ReadAllLines("inputs/01.txt");
+            Part1(lines);
+            Part2(lines);
+            Logger.Log("");
+        }
+
+        private static void Part1(IEnumerable<string> lines)
+        {
+            using var t = new Timer();
+
+            int lastDepth = 0;
+            int numIncreased = -1;
+
+            foreach (var line in lines)
+            {
+                var depth = Convert.ToInt32(line);
+                if (depth > lastDepth)
+                {
+                    numIncreased++;
+                }
+
+                lastDepth = depth;
+            }
+
+            Logger.Log($"part1: {numIncreased}");
+        }
+
+        private static void Part2(IEnumerable<string> lines)
+        {
+            using var t = new Timer();
+
+            int lastTotal = 0;
+            int numIncreased = -1;
+            int num1 = -1;
+            int num2 = -1;
+            int num3 = -1;
+
+            foreach (var line in lines)
+            {
+                var depth = Convert.ToInt32(line);
+                num1 = num2;
+                num2 = num3;
+                num3 = depth;
+
+                if (num1 < 0 || num2 < 0 || num3 < 0)
+                {
+                    continue;
+                }
+
+                var total = num1 + num2 + num3;
+                if (total > lastTotal)
+                {
+                    numIncreased++;
+                }
+
+                lastTotal = total;
+            }
+
+            Logger.Log($"part2: {numIncreased}");
+        }
+    }
+}