AliveDevil/AdventOfCode
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Finish Day 08

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This commit is contained in:
Jöran Malek 2024-12-25 02:03:42 +01:00
parent d9bc639366
commit 00bfb7d46e
11 changed files with 308 additions and 1 deletions
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11
.vscode/launch.json vendored
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@ -80,6 +80,17 @@
"cwd": "${workspaceFolder}",
"stopAtEntry": false,
"console": "internalConsole"
},
{
"name": "aoc-2024-08 Debug",
"type": "coreclr",
"request": "launch",
"preLaunchTask": "dotnet: build aoc-2024-08",
"program": "${workspaceFolder}/artifacts/bin/aoc-2024-08/debug/aoc-2024-08.dll",
"args": ["part-one", "data/2024/08/dev.txt"],
"cwd": "${workspaceFolder}",
"stopAtEntry": false,
"console": "internalConsole"
}
]
}

8
.vscode/tasks.json vendored
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@ -58,6 +58,14 @@
"group": "build",
"problemMatcher": [],
"label": "dotnet: build aoc-2024-07"
},
{
"type": "dotnet",
"task": "build aoc-2024-08.csproj",
"file": "src/2024/08/aoc-2024-08.csproj",
"group": "build",
"problemMatcher": [],
"label": "dotnet: build aoc-2024-08"
}
]
}

15
AdventOfCode.sln
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@ -1,4 +1,4 @@

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.0.31903.59
@ -19,6 +19,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "aoc-2024-06", "src\2024\06\
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "aoc-2024-07", "src\2024\07\aoc-2024-07.csproj", "{58941BB2-E4AC-40F0-AA92-BEF51DEFC859}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "aoc-2024-08", "src\2024\08\aoc-2024-08.csproj", "{44BBC1CF-D2FC-4906-9691-B439EC9EFB8C}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "core", "src\core\core.csproj", "{9E2BD5D6-55DD-4760-AD30-75B168F03F60}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@ -56,6 +60,14 @@ Global
{58941BB2-E4AC-40F0-AA92-BEF51DEFC859}.Debug|Any CPU.Build.0 = Debug|Any CPU
{58941BB2-E4AC-40F0-AA92-BEF51DEFC859}.Release|Any CPU.ActiveCfg = Release|Any CPU
{58941BB2-E4AC-40F0-AA92-BEF51DEFC859}.Release|Any CPU.Build.0 = Release|Any CPU
{44BBC1CF-D2FC-4906-9691-B439EC9EFB8C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{44BBC1CF-D2FC-4906-9691-B439EC9EFB8C}.Debug|Any CPU.Build.0 = Debug|Any CPU
{44BBC1CF-D2FC-4906-9691-B439EC9EFB8C}.Release|Any CPU.ActiveCfg = Release|Any CPU
{44BBC1CF-D2FC-4906-9691-B439EC9EFB8C}.Release|Any CPU.Build.0 = Release|Any CPU
{9E2BD5D6-55DD-4760-AD30-75B168F03F60}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{9E2BD5D6-55DD-4760-AD30-75B168F03F60}.Debug|Any CPU.Build.0 = Debug|Any CPU
{9E2BD5D6-55DD-4760-AD30-75B168F03F60}.Release|Any CPU.ActiveCfg = Release|Any CPU
{9E2BD5D6-55DD-4760-AD30-75B168F03F60}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(NestedProjects) = preSolution
{FAF70800-E2C3-4AD7-B433-86C1F20380F7} = {37CA8017-085A-4F6A-BADB-535F929C10B9}
@ -65,5 +77,6 @@ Global
{D108A6AB-B974-4BD9-B97A-CB1D1A2F3920} = {37CA8017-085A-4F6A-BADB-535F929C10B9}
{EEC6EF36-EE16-4DB4-9AE8-CF0234751458} = {37CA8017-085A-4F6A-BADB-535F929C10B9}
{58941BB2-E4AC-40F0-AA92-BEF51DEFC859} = {37CA8017-085A-4F6A-BADB-535F929C10B9}
{44BBC1CF-D2FC-4906-9691-B439EC9EFB8C} = {37CA8017-085A-4F6A-BADB-535F929C10B9}
EndGlobalSection
EndGlobal

58
src/2024/08/Program.cs Normal file
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@ -0,0 +1,58 @@
using System.Collections.Immutable;
using ConsoleAppFramework;
using core;
var builder = ConsoleApp.Create();
builder.Add("part-one", static ([Argument, FileExists] string file) =>
{
Console.WriteLine($"Result: {ReadFile(file, false)}");
});
builder.Add("part-two", static ([Argument, FileExists] string file) =>
{
Console.WriteLine($"Result: {ReadFile(file, true)}");
});
builder.Run(args);
static int ReadFile(string path, bool resonant)
{
SymbolGrid grid = new();
grid.Load(path);
ScenarioMap map = new(grid);
HashSet<Vector2I> antinodes = [];
foreach (var (key, set) in map.Antennas)
{
for (int l = set.Length - 1; l > 0; l--)
{
for (int r = 0; r < l; r++)
{
var d = set[l] - set[r];
for (int i = resonant ? 1 : 2; resonant || i < 3; i++)
{
bool valid = false;
var fl = set[l] - d * i;
if (grid.IsValid(fl))
{
valid = true;
antinodes.Add(fl);
}
var fr = set[r] + d * i;
if (grid.IsValid(fr))
{
valid = true;
antinodes.Add(fr);
}
if (!valid)
{
break;
}
}
}
}
}
return antinodes.Count;
}

31
src/2024/08/ScenarioMap.cs Normal file
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@ -0,0 +1,31 @@
using System.Collections.Frozen;
using System.Collections.Immutable;
using System.Runtime.InteropServices;
using core;
record class ScenarioMap
{
private readonly SymbolGrid _grid;
public FrozenDictionary<char, ImmutableArray<Vector2I>> Antennas { get; }
public ScenarioMap(SymbolGrid grid)
{
_grid = grid;
Dictionary<char, HashSet<Vector2I>> antennas = [];
foreach (var (position, symbol) in grid)
{
if (char.IsLetterOrDigit(symbol))
{
(CollectionsMarshal.GetValueRefOrAddDefault(
antennas,
symbol,
out _
) ??= []).Add(position);
}
}
Antennas = antennas.ToFrozenDictionary(c => c.Key, c => (ImmutableArray<Vector2I>)[.. c.Value]);
}
}

15
src/2024/08/aoc-2024-08.csproj Normal file
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@ -0,0 +1,15 @@
<Project Sdk="Microsoft.NET.Sdk">
<ItemGroup>
<ProjectReference Include="..\..\core\core.csproj" />
</ItemGroup>
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
<RootNamespace>aoc_2024_08</RootNamespace>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

0
src/2024/Directory.Build.props → src/Directory.Build.props
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8
src/core/FileExistsAttribute.cs Normal file
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@ -0,0 +1,8 @@
using System.ComponentModel.DataAnnotations;
namespace core;
public class FileExistsAttribute : ValidationAttribute
{
public override bool IsValid(object? value) => value is string path && File.Exists(path);
}

126
src/core/SymbolGrid.cs Normal file
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@ -0,0 +1,126 @@
using System.Diagnostics.CodeAnalysis;
using System.IO.MemoryMappedFiles;
using System.Numerics;
namespace core;
public class SymbolGrid
{
private char[]? _map;
[DisallowNull]
public char? this[int x, int y]
{
get
{
EnsureMap();
return IsValid(x, y) ? _map[y * Height + x] : null;
}
set
{
EnsureMap();
if (IsValid(x, y))
{
_map[y * Height + x] = value.Value;
}
}
}
[DisallowNull]
public char? this[Vector2I i]
{
get => this[i.X, i.Y];
set => this[i.X, i.Y] = value;
}
public int Width { get; private set; }
public int Height { get; private set; }
public void Load(string file)
{
using var fileView = MemoryMappedFile.CreateFromFile(file, FileMode.Open);
using var accessor = fileView.CreateViewAccessor();
(Width, var stride, Height) = Parse(accessor);
_map = new char[Width * Height];
for (int x = 0; x < Width; x++)
{
for (int y = 0; y < Height; y++)
{
_map[y * Height + x] = (char)accessor.ReadByte(y * stride + x);
}
}
static (int Width, int Stride, int Height) Parse(MemoryMappedViewAccessor map)
{
bool hasNewLine = false;
int? width = null, stride = null;
for (int i = 0; i < map.Capacity; i++)
{
if ((char)map.ReadByte(i) is '\r' or '\n')
{
if (!hasNewLine)
{
width = i;
}
hasNewLine = true;
}
else if (hasNewLine)
{
stride = i;
break;
}
}
return (width!.Value, stride!.Value, (int)((map.Capacity + width.Value) / stride.Value));
}
}
public SymbolEnumerator GetEnumerator() => new(this);
public bool IsValid(Vector2I p) => IsValid(p.X, p.Y);
public bool IsValid(int x, int y)
{
EnsureMap();
return x >= 0 && x < Width && y >= 0 && y < Height;
}
public ref struct SymbolEnumerator
{
private readonly SymbolGrid _grid;
private readonly int _length;
private int? _current;
internal SymbolEnumerator(SymbolGrid grid)
{
_grid = grid;
_length = grid.Width * grid.Height;
}
public (Vector2I Position, char Symbol) Current { get; private set; }
public bool MoveNext()
{
_current = _current.HasValue ? _current + 1 : 0;
if (_current == _length)
{
return false;
}
Current = (_grid.ToVector(_current.Value), _grid._map![_current.Value]);
return true;
}
}
private Vector2I ToVector(int index) => new()
{
Y = index / Height,
X = index % Height
};
[MemberNotNull(nameof(_map))]
private void EnsureMap() => ArgumentNullException.ThrowIfNull(_map);
}

28
src/core/Vector2I.cs Normal file
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@ -0,0 +1,28 @@
using System.Numerics;
namespace core;
public record struct Vector2I(int X, int Y) :
IAdditionOperators<Vector2I, Vector2I, Vector2I>,
ISubtractionOperators<Vector2I, Vector2I, Vector2I>,
IMultiplyOperators<Vector2I, int, Vector2I>
{
public readonly double Length => Math.ReciprocalSqrtEstimate(SquareLength);
public readonly int SquareLength => X * X + Y * Y;
public static Vector2I operator +(Vector2I left, Vector2I right)
{
return new(left.X + right.X, left.Y + right.Y);
}
public static Vector2I operator -(Vector2I left, Vector2I right)
{
return new(left.X - right.X, left.Y - right.Y);
}
public static Vector2I operator *(Vector2I left, int right)
{
return new(left.X * right, left.Y * right);
}
}

9
src/core/core.csproj Normal file
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@ -0,0 +1,9 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>