From 7f75bba4b98a5aea6dfe9aa8eb79b9fb1c43d16f Mon Sep 17 00:00:00 2001
From: Martin Zikmund <martin@zikmund.dev>
Date: Thu, 21 Dec 2023 13:06:46 +0100
Subject: [PATCH] Day 14 (Part 2)

---
 Day14_2/Day14_2.csproj                 |  24 +++++
 Day14_2/Program.cs                     | 127 +++++++++++++++++++++++++
 Day14_2/Properties/launchSettings.json |   7 ++
 Day14_2/input.txt                      | 100 +++++++++++++++++++
 Day14_2/output.txt                     |   0
 5 files changed, 258 insertions(+)
 create mode 100644 Day14_2/Day14_2.csproj
 create mode 100644 Day14_2/Program.cs
 create mode 100644 Day14_2/Properties/launchSettings.json
 create mode 100644 Day14_2/input.txt
 create mode 100644 Day14_2/output.txt

diff --git a/Day14_2/Day14_2.csproj b/Day14_2/Day14_2.csproj
new file mode 100644
index 0000000..051c6b3
--- /dev/null
+++ b/Day14_2/Day14_2.csproj
@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Remove="input.txt" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="input.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Tools\Tools.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/Day14_2/Program.cs b/Day14_2/Program.cs
new file mode 100644
index 0000000..84e8e43
--- /dev/null
+++ b/Day14_2/Program.cs
@@ -0,0 +1,127 @@
+var input = File.ReadAllLines("input.txt");
+
+var width = input[0].Length;
+var height = input.Length;
+
+var map = new char[width, height];
+var rotatedMap = new char[height, width];
+
+for (var y = 0; y < height; y++)
+{
+    for (var x = 0; x < width; x++)
+    {
+        map[x, y] = input[y][x];
+    }
+}
+
+Dictionary<int, long> visited = new();
+
+var currentWidth = width;
+var currentHeight = height;
+
+for (var cycle = 0L; cycle < 1000000000; cycle++)
+{
+    var hash = HashMap(map, currentWidth, currentHeight);
+    if (visited.ContainsKey(hash))
+    {
+        var cycleLength = cycle - visited[hash];
+        var remainingCycles = 1000000000 - cycle;
+        var cyclesToSkip = remainingCycles / cycleLength;
+        cycle += cyclesToSkip * cycleLength;
+        visited.Clear();
+    }
+    else
+    {
+        visited.Add(hash, cycle);
+    }
+
+    for (int i = 0; i < 4; i++)
+    {
+        TiltUp(map, width, height);
+        RotateCw(map, rotatedMap, currentWidth, currentHeight);
+        (map, rotatedMap) = (rotatedMap, map);
+        (currentWidth, currentHeight) = (currentHeight, currentWidth);
+    }
+}
+
+Console.WriteLine(CalculateLoad(map, width, height));
+Console.ReadKey();
+
+static int HashMap(char[,] map, int width, int height)
+{
+    var hash = 0;
+    for (var y = 0; y < height; y++)
+    {
+        for (var x = 0; x < width; x++)
+        {
+            hash = (hash * 31) + map[x, y];
+        }
+    }
+
+    return hash;
+}
+
+static void TiltUp(char[,] map, int width, int height)
+{
+    for (int x = 0; x < width; x++)
+    {
+        void OutputStones(int stones, int y)
+        {
+            for (int i = 0; i < stones; i++)
+            {
+                map[x, y + 1 + i] = 'O';
+            }
+        }
+
+        // Start at the bottom of the column
+        var stones = 0;
+        var y = height - 1;
+        while (y >= 0)
+        {
+            if (map[x, y] == 'O')
+            {
+                // Go up, count stones and replace with empty
+                stones++;
+                map[x, y] = '.';
+            }
+            else if (map[x, y] == '#')
+            {
+                OutputStones(stones, y);
+                stones = 0;
+            }
+            y--;
+        }
+
+        OutputStones(stones, y);
+    }
+}
+
+static int CalculateLoad(char[,] map, int width, int height)
+{
+    var load = 0;
+    for (int y = 0; y < height; y++)
+    {
+        for (int x = 0; x < width; x++)
+        {
+            if (map[x, y] == 'O')
+            {
+                load += (height - y);
+            }
+        }
+    }
+
+    return load;
+}
+
+static void RotateCw(char[,] source, char[,] target, int sourceWidth, int sourceHeight)
+{
+    var targetWidth = sourceHeight;
+    var targetHeight = sourceWidth;
+    for (var y = 0; y < sourceHeight; y++)
+    {
+        for (var x = 0; x < sourceWidth; x++)
+        {
+            target[targetWidth - y - 1, x] = source[x, y];
+        }
+    }
+}
\ No newline at end of file
diff --git a/Day14_2/Properties/launchSettings.json b/Day14_2/Properties/launchSettings.json
new file mode 100644
index 0000000..458e04e
--- /dev/null
+++ b/Day14_2/Properties/launchSettings.json
@@ -0,0 +1,7 @@
+{
+  "profiles": {
+    "Run": {
+      "commandName": "Project"
+    }
+  }
+}
\ No newline at end of file
diff --git a/Day14_2/input.txt b/Day14_2/input.txt
new file mode 100644
index 0000000..0a3639f
--- /dev/null
+++ b/Day14_2/input.txt
@@ -0,0 +1,100 @@
+O...#.O......#...##....O#.#.OO...O.#OO#.....#O.O.....#......#.OO...O...O..O#O#....#...O..O...O.....O
+.OO......O.OO.O.#.#O.O...#.##OO.....#.#O#...OOOOO..##O#O..O#O.##O...#O....O#.#.OO....#.........O.O.O
+......O.O.O.....O.#.#.#OO#O#.O...O.#.......#O....#.O.#....OOO...#....O#O.......#......O...O##...O...
+O...##O..#....OO.OO....O...O...O#..##.OOO..O..#OO....###....OO.O.O...........O...O..O.....#.#..O.O#.
+............#.#.##O.O.#.#OO#........O..O.O..##....O.#..#O..O...O#.#.#.........O...........OO......O.
+#.OO........#..#O.#......#....#....#......OO..OO...O#...#...#..##..O#.O......#.#..O..#O#...#..#.O#.O
+O.O.##...........O...O..O...O.OO.......##....#...O.....##...#.....OO...O.O#...OO..........O...O..#O.
+.O##....#.O#O....O.O.#.#O.O#..OO..##..#OO.#...#......#.#O#.....O...O#.O...#..O.#.#......#.##.O....O.
+.........#..#.O..O..O.O...#.#.O...#.OOO.##..#.O.....OO#....O...OOO#.O#....##O..#.O.O.....O.O.O.O..O.
+......#O.....OOO###.O..O####O.#.O...............#..O......##O...#.#..###...O....#O...OO.OO.O......O.
+#.O....#.O..#O...#...#...O....OOO.#O.#.#..#.....#.#..OO..#OO.......#OO.OOO....O.#O.#.O......####..O.
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+...##.#.##.#O....O#..O..O.........#.#.#O...O.......O...O#..OOOO....O...O.OO#.O.##...#....O..O.......
+....##.###OOO.O...#.......OO....OOO....O.OO#..O.#..OO....OO......O..OO...OOO.OO#...#..OOO..O.###O...
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+.#.#.OOO.O.......#O..O.#..O.OO.OO.O..O.#.#...O.O.OO..##..O...#...#O#..O.........O.O..O.O#....O..#O..
+.#..#O.#O..#.O.O.O...#OO....#...O....O..O.O...#..#.##O.O..O..#O.....OO##...O#.......O#O.#..........#
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+O.....#...#.#OOO.OOOO..#O.O.#...O.##..OO..#O...#.....OO#..#.#...O##OO...O.....O..#...#...........O.O
+.##.O#.O..#O#.O##.O.#.........##.O......#OO...OO.......#...#O.O#...O..#.#...O..#...#O...O.#....OO.OO
+.O#OO.O..#...#..O..O...##.O....###O.....O...#.#OOO...OO...O.......#.#.#.OO....#OO.#..O..........OO..
+.....#OO.O..O.O.O...O.O#.#.O...O..#...O##.......#......#O...#.#.#....#..O.O..#..........O..#.#..#O..
+...O.O.O.OO...O#..O..OO..O#.#.O.#OO..O.O..OO..O#...#.O#...O.......#..#..O..##..O..#O......O.OO...O.O
+#.O....O.O.#...O.....O.....O#......#.#..OO...#.....O.#.#.O...#.#....#....O#.O.#......#OOO.O...O#....
+...OOO......#..O..O#.......#....O#OO..#O.#.#...#...O.O..OO..#.O...O..#.....OO..O..#...#.O...O#..O.OO
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+.O.O.O##..#O.O#O...##.#OO#...#.OO#..O...O#...O....O#..OO....O....#...O...#OO.OO#O....#..O..#OO....O.
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+..#...#O.....OO#.....O..#.#O.#.#..#..O.....#...OO.#.....O..O.O##.O.....OOOO.#O.....O.#..O........#.#
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\ No newline at end of file
diff --git a/Day14_2/output.txt b/Day14_2/output.txt
new file mode 100644
index 0000000..e69de29