From da70944d565ab6c87f8514c9bac7e36cf9935b1e Mon Sep 17 00:00:00 2001
From: Jake <jake@jakecharman.co.uk>
Date: Fri, 2 Dec 2022 20:23:35 +0000
Subject: [PATCH] Completed 2015 Day 3

---
 2015/Day-03/Day03.cs | 75 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 2015/Day-03/Day03.cs

diff --git a/2015/Day-03/Day03.cs b/2015/Day-03/Day03.cs
new file mode 100644
index 0000000..0525a73
--- /dev/null
+++ b/2015/Day-03/Day03.cs
@@ -0,0 +1,75 @@
+class Santa{
+    public int x;
+    public int y;
+
+    public void move(char direction){
+        switch(direction){
+            case '^':
+                this.y++;
+                break;
+            case 'v':
+                this.y--;
+                break;
+            case '>':
+                this.x++;
+                break;
+            case '<':
+                this.x--;
+                break;
+            default:
+                throw new InvalidDataException("Input did not match expected format!");
+        }
+    }
+}
+
+class Program{
+    // Load in the input.
+    static string input = File.ReadAllText(@"input.txt").ToString();
+
+    static int partOne(){
+        Santa santa = new Santa();
+
+        // Put all houses we've delivered to in a list.
+        List<string> delivered = new List<string>();
+        foreach(char direction in input){
+            delivered.Add(santa.x.ToString() + "," + santa.y.ToString());
+            santa.move(direction);
+        }
+
+        // Dedupe the list.
+        return(delivered.Distinct().ToList().Count());
+    }
+
+    static int partTwo(){
+        Santa realSanta = new Santa();
+        Santa roboSanta = new Santa();
+
+        // Evry other move, move one set of coordinates and add them to the list.
+        int currentMove = 0;
+        List<string> delivered = new List<string>();
+
+        foreach(char move in input){
+            switch(currentMove%2){
+                case 0:
+                    delivered.Add(roboSanta.x.ToString() + "," + roboSanta.y.ToString());
+                    roboSanta.move(move);
+                    break;
+                default:
+                    delivered.Add(realSanta.x.ToString() + "," + realSanta.y.ToString());
+                    realSanta.move(move);
+                    break;
+                    
+            }
+            currentMove++;
+        }
+
+        // Return the deduped list.
+        return(delivered.Distinct().ToList().Count());
+    }
+
+    static void Main(){
+        // Print Answers.
+        Console.WriteLine("Part 1: " + partOne().ToString());
+        Console.WriteLine("Part 2: " + partTwo().ToString());
+    }
+}