atrauzzi · December 14, 2015 01:53 · Dec 14, 2015
diff --git a/Program.cs b/Program.cs
@@ -0,0 +1,70 @@
+namespace Day3Part1 {
+
+	using System;
+	using System.Collections.Generic;
+	using System.IO;
+	using System.Linq;
+	using System.Threading.Tasks;
+
+	public static class Extensions {
+
+		public static void DeliverPresent(this Dictionary<Tuple<int, int>, int> houses, Tuple<int, int> house) {
+			if (houses.ContainsKey(house))
+				houses[house] += 1;
+			else
+				houses[house] = 1;
+		}
+
+		public static Tuple<int, int> GoRight(this Tuple<int, int> currentHouse) {
+			return new Tuple<int, int>(currentHouse.Item1 + 1, currentHouse.Item2);
+		}
+
+		public static Tuple<int, int> GoLeft(this Tuple<int, int> currentHouse) {
+			return new Tuple<int, int>(currentHouse.Item1 - 1, currentHouse.Item2);
+		}
+
+		public static Tuple<int, int> GoUp(this Tuple<int, int> currentHouse) {
+			return new Tuple<int, int>(currentHouse.Item1, currentHouse.Item2 + 1);
+		}
+
+		public static Tuple<int, int> GoDown(this Tuple<int, int> currentHouse) {
+			return new Tuple<int, int>(currentHouse.Item1, currentHouse.Item2 - 1);
+		}
+
+	}
+
+	public class Program {
+
+		public static void Main(string[] args) {
+
+			Dictionary<Tuple<int, int>, int> houses = new Dictionary<Tuple<int,int>, int>();
+			string input = File.ReadAllText("Input.txt");
+
+			Tuple<int, int> currentHouse = new Tuple<int, int>(0, 0);
+			// For some reason, we deliver to where we're at.  So do that.
+			houses.DeliverPresent(currentHouse);
+
+			foreach(char instruction in input) {
+
+				if (instruction == '<')
+					currentHouse = currentHouse.GoLeft();
+				else if (instruction == '>')
+					currentHouse = currentHouse.GoRight();
+				else if (instruction == '^')
+					currentHouse = currentHouse.GoUp();
+				else if (instruction == 'v')
+					currentHouse = currentHouse.GoDown();
+
+				houses.DeliverPresent(currentHouse);
+
+			}
+
+			Console.WriteLine($"{houses.Count()} houses got presents!");
+
+			Console.ReadKey();
+
+		}
+
+	}
+
+}