Day 10 - Part 1

Advent.csproj

@@ -10,6 +10,9 @@
   </ItemGroup>
 
   <ItemGroup>
+    <None Update="Day10\input.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
     <None Update="Day1\input.txt">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>

Advent.csproj.DotSettings

@@ -1,5 +1,6 @@
 <wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day1/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day10/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day2/@EntryIndexedValue">True</s:Boolean>
 	<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>

Day10/Day10.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace Advent
+{
+    public static class Day10
+    {
+        public static void Execute()
+        {
+            var lines = File.ReadAllLines(@".\Day10\input.txt");
+
+            var y = 0;
+
+            var asteroids = new List<Tuple<int, int>>();
+
+            foreach (var line in lines)
+            {
+                var x = 0;
+
+                foreach (var cell in line.ToCharArray())
+                {
+                    if (cell == '#')
+                        asteroids.Add(new Tuple<int, int>(x, y));
+
+                    x++;
+                }
+
+                y++;
+            }
+
+            var bestLocation = new Tuple<int, int>(-1, -1);
+            var bestCount = 0;
+
+            foreach (var potentialAsteroid in asteroids)
+            {
+                var angles = new HashSet<double>();
+
+                foreach (var asteroid in asteroids)
+                {
+                    if (asteroid.Equals(potentialAsteroid))
+                        continue;
+
+                    var angle = Math.Atan2(asteroid.Item2 - potentialAsteroid.Item2, asteroid.Item1 - potentialAsteroid.Item1);
+
+                    if (!angles.Contains(angle))
+                        angles.Add(angle);
+                }
+
+                if (angles.Count > bestCount)
+                {
+                    bestCount = angles.Count;
+                    bestLocation = potentialAsteroid;
+                }
+            }
+
+            Console.WriteLine($"{bestLocation.Item1},{bestLocation.Item2} = {bestCount}");
+        }
+    }
+}

Day10/input.txt

@@ -0,0 +1,26 @@
+.##.#.#....#.#.#..##..#.#.
+#.##.#..#.####.##....##.#.
+###.##.##.#.#...#..###....
+####.##..###.#.#...####..#
+..#####..#.#.#..#######..#
+.###..##..###.####.#######
+.##..##.###..##.##.....###
+#..#..###..##.#...#..####.
+....#.#...##.##....#.#..##
+..#.#.###.####..##.###.#.#
+.#..##.#####.##.####..#.#.
+#..##.#.#.###.#..##.##....
+#.#.##.#.##.##......###.#.
+#####...###.####..#.##....
+.#####.#.#..#.##.#.#...###
+.#..#.##.#.#.##.#....###.#
+.......###.#....##.....###
+#..#####.#..#..##..##.#.##
+##.#.###..######.###..#..#
+#.#....####.##.###....####
+..#.#.#.########.....#.#.#
+.##.#.#..#...###.####..##.
+##...###....#.##.##..#....
+..##.##.##.#######..#...#.
+.###..#.#..#...###..###.#.
+#..#..#######..#.#..#..#.#

Program.cs

@@ -12,7 +12,8 @@
             //Day6.Execute();
             //Day7.Execute();
             //Day8.Execute();
-            Day9.Execute();
+            //Day9.Execute();
+            Day10.Execute();
         }
     }
 }