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Day 14 (Part 2)
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@MartinZikmund
MartinZikmund committed Dec 21, 2023
1 parent 982c87b commit 7f75bba
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24 changes: 24 additions & 0 deletions Day14_2/Day14_2.csproj
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<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>
127 changes: 127 additions & 0 deletions Day14_2/Program.cs
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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];
}
}
}
7 changes: 7 additions & 0 deletions Day14_2/Properties/launchSettings.json
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{
"profiles": {
"Run": {
"commandName": "Project"
}
}
}
100 changes: 100 additions & 0 deletions Day14_2/input.txt
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O...#.O......#...##....O#.#.OO...O.#OO#.....#O.O.....#......#.OO...O...O..O#O#....#...O..O...O.....O
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