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Day10 #11

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merged 3 commits into from
Dec 14, 2024
Merged

Day10 #11

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e232f0b
Add day10
LittleAndi Dec 10, 2024
383929b
Solution for day 10, part 1
LittleAndi Dec 10, 2024
0d96599
Solution for day 10, part 2
LittleAndi Dec 14, 2024
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13 changes: 13 additions & 0 deletions advent-of-code-2024.sln
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "day09", "day09\day09.csproj
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "day09tests", "tests\day09tests\day09tests.csproj", "{F6CA4DB1-2F70-4418-B5EA-F2063015C7DC}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "day10", "day10\day10.csproj", "{A16D82E8-6F58-4A7F-A277-282C534F0BB0}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "day10tests", "tests\day10tests\day10tests.csproj", "{DB0D84F3-4032-49C1-96CF-5629E8325CCC}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Expand Down Expand Up @@ -122,6 +126,14 @@ Global
{F6CA4DB1-2F70-4418-B5EA-F2063015C7DC}.Debug|Any CPU.Build.0 = Debug|Any CPU
{F6CA4DB1-2F70-4418-B5EA-F2063015C7DC}.Release|Any CPU.ActiveCfg = Release|Any CPU
{F6CA4DB1-2F70-4418-B5EA-F2063015C7DC}.Release|Any CPU.Build.0 = Release|Any CPU
{A16D82E8-6F58-4A7F-A277-282C534F0BB0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{A16D82E8-6F58-4A7F-A277-282C534F0BB0}.Debug|Any CPU.Build.0 = Debug|Any CPU
{A16D82E8-6F58-4A7F-A277-282C534F0BB0}.Release|Any CPU.ActiveCfg = Release|Any CPU
{A16D82E8-6F58-4A7F-A277-282C534F0BB0}.Release|Any CPU.Build.0 = Release|Any CPU
{DB0D84F3-4032-49C1-96CF-5629E8325CCC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{DB0D84F3-4032-49C1-96CF-5629E8325CCC}.Debug|Any CPU.Build.0 = Debug|Any CPU
{DB0D84F3-4032-49C1-96CF-5629E8325CCC}.Release|Any CPU.ActiveCfg = Release|Any CPU
{DB0D84F3-4032-49C1-96CF-5629E8325CCC}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(NestedProjects) = preSolution
{0F1C1F9C-FDF2-4025-B60E-485EAD0C3905} = {F2656488-9555-4789-A912-089F50725E8D}
Expand All @@ -133,5 +145,6 @@ Global
{AB76B34D-C32C-4825-BD24-CF97D77AAFF1} = {F2656488-9555-4789-A912-089F50725E8D}
{41963400-1A0B-4AD9-9B34-11BA7D415EFD} = {F2656488-9555-4789-A912-089F50725E8D}
{F6CA4DB1-2F70-4418-B5EA-F2063015C7DC} = {F2656488-9555-4789-A912-089F50725E8D}
{DB0D84F3-4032-49C1-96CF-5629E8325CCC} = {F2656488-9555-4789-A912-089F50725E8D}
EndGlobalSection
EndGlobal
156 changes: 156 additions & 0 deletions day10/Program.cs
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var lines = File.ReadAllLines("input.txt")
.Where(line => !string.IsNullOrWhiteSpace(line))
.Select(l => l.ToCharArray().Select(c => (int)char.GetNumericValue(c)).ToArray())
.ToArray();

var map = new TopographicMap(lines);
var trailheadScores = map.CalculateTrailheadScores();
var sumOfTrailheadScores = trailheadScores.Sum();
System.Console.WriteLine($"Sum of trailhead scores: {sumOfTrailheadScores}");

var trailheadRatings = map.CalculateTrailheadRatings();
var sumOfTrailheadRatings = trailheadRatings.Sum();
System.Console.WriteLine($"Sum of trainhead ratings: {sumOfTrailheadRatings}");

public class TopographicMap(int[][] input)
{
private readonly int[][] map = input;

public List<int> CalculateTrailheadScores()
{
List<int> trailheadScores = [];

for (int y = 0; y < map.Length; y++)
{
var trailheadIndex = Array.FindIndex(map[y], x => x == 0);
while (trailheadIndex >= 0)
{
// Depth-First Search from this start position, search for nines
var score = DepthFirstSearch(new Position { X = trailheadIndex, Y = y });
trailheadScores.Add(score);

trailheadIndex = Array.FindIndex(map[y], trailheadIndex + 1, x => x == 0);
}
}

return trailheadScores;
}

public List<int> CalculateTrailheadRatings()
{
List<int> trailheadRatings = [];

for (int y = 0; y < map.Length; y++)
{
var trailheadIndex = Array.FindIndex(map[y], x => x == 0);
while (trailheadIndex >= 0)
{
// Depth-First Search from this start position, search for nines
var score = DepthFirstSearchAllTracks(new Position { X = trailheadIndex, Y = y });
trailheadRatings.Add(score);

trailheadIndex = Array.FindIndex(map[y], trailheadIndex + 1, x => x == 0);
}
}

return trailheadRatings;
}

private int DepthFirstSearch(Position trailhead)
{
var score = 0;
HashSet<Position> discovered = [];
var stack = new Stack<Position>();
stack.Push(trailhead);
while (stack.Count > 0)
{
var position = stack.Pop();
if (discovered.Add(position))
{
if (map[position.Y][position.X] == 9)
{
score++;
continue;
}

// Check all directions for next level
// Up
if (position.Y - 1 >= 0 && map[position.Y - 1][position.X] == map[position.Y][position.X] + 1)
{
stack.Push(new Position { X = position.X, Y = position.Y - 1 });
}

// Right
if (position.X + 1 < map[position.Y].Length && map[position.Y][position.X + 1] == map[position.Y][position.X] + 1)
{
stack.Push(new Position { X = position.X + 1, Y = position.Y });
}

// Down
if (position.Y + 1 < map.Length && map[position.Y + 1][position.X] == map[position.Y][position.X] + 1)
{
stack.Push(new Position { X = position.X, Y = position.Y + 1 });
}

// Left
if (position.X - 1 >= 0 && map[position.Y][position.X - 1] == map[position.Y][position.X] + 1)
{
stack.Push(new Position { X = position.X - 1, Y = position.Y });
}
}
}

return score;
}

private int DepthFirstSearchAllTracks(Position trailhead)
{
var score = 0;
var stack = new Stack<Position>();
stack.Push(trailhead);
while (stack.Count > 0)
{
var position = stack.Pop();

if (map[position.Y][position.X] == 9)
{
score++;
continue;
}

// Check all directions for next level
// Up
if (position.Y - 1 >= 0 && map[position.Y - 1][position.X] == map[position.Y][position.X] + 1)
{
stack.Push(new Position { X = position.X, Y = position.Y - 1 });
}

// Right
if (position.X + 1 < map[position.Y].Length && map[position.Y][position.X + 1] == map[position.Y][position.X] + 1)
{
stack.Push(new Position { X = position.X + 1, Y = position.Y });
}

// Down
if (position.Y + 1 < map.Length && map[position.Y + 1][position.X] == map[position.Y][position.X] + 1)
{
stack.Push(new Position { X = position.X, Y = position.Y + 1 });
}

// Left
if (position.X - 1 >= 0 && map[position.Y][position.X - 1] == map[position.Y][position.X] + 1)
{
stack.Push(new Position { X = position.X - 1, Y = position.Y });
}
}

return score;
}

struct Position
{
public int X;
public int Y;
}
}

10 changes: 10 additions & 0 deletions day10/day10.csproj
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<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>

</Project>
126 changes: 126 additions & 0 deletions tests/day10tests/UnitTests.cs
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using System.Runtime.InteropServices.Marshalling;
using Shouldly;

namespace day10tests;

public class UnitTests
{
[Fact]
public void Test1()
{
string[] lines = [
"...0...",
"...1...",
"...2...",
"6543456",
"7.....7",
"8.....8",
"9.....9",
];
var input = lines.Select(l => l.ToCharArray().Select(c => (int)char.GetNumericValue(c)).ToArray()).ToArray();
var topographicMap = new TopographicMap(input);
var trailheadScores = topographicMap.CalculateTrailheadScores();
trailheadScores.Count.ShouldBe(1);
trailheadScores.Sum().ShouldBe(2);
}

[Fact]
public void Test2()
{
string[] lines = [
"89010123",
"78121874",
"87430965",
"96549874",
"45678903",
"32019012",
"01329801",
"10456732",
];
var input = lines.Select(l => l.ToCharArray().Select(c => (int)char.GetNumericValue(c)).ToArray()).ToArray();
var topographicMap = new TopographicMap(input);
var trailheadScores = topographicMap.CalculateTrailheadScores();
trailheadScores.Count.ShouldBe(9);
trailheadScores.Sum().ShouldBe(36);
}

[Fact]
public void Test3()
{
string[] lines = [
".....0.",
"..4321.",
"..5..2.",
"..6543.",
"..7..4.",
"..8765.",
"..9....",
];

var input = lines.Select(l => l.ToCharArray().Select(c => (int)char.GetNumericValue(c)).ToArray()).ToArray();
var topographicMap = new TopographicMap(input);
var trailheadRatings = topographicMap.CalculateTrailheadRatings();
trailheadRatings.Count.ShouldBe(1);
trailheadRatings.Sum().ShouldBe(3);
}

[Fact]
public void Test4()
{
string[] lines = [
"..90..9",
"...1.98",
"...2..7",
"6543456",
"765.987",
"876....",
"987....",
];

var input = lines.Select(l => l.ToCharArray().Select(c => (int)char.GetNumericValue(c)).ToArray()).ToArray();
var topographicMap = new TopographicMap(input);
var trailheadRatings = topographicMap.CalculateTrailheadRatings();
trailheadRatings.Count.ShouldBe(1);
trailheadRatings.Sum().ShouldBe(13);
}

[Fact]
public void Test5()
{
string[] lines = [
"012345",
"123456",
"234567",
"345678",
"4.6789",
"56789.",
];

var input = lines.Select(l => l.ToCharArray().Select(c => (int)char.GetNumericValue(c)).ToArray()).ToArray();
var topographicMap = new TopographicMap(input);
var trailheadRatings = topographicMap.CalculateTrailheadRatings();
trailheadRatings.Count.ShouldBe(1);
trailheadRatings.Sum().ShouldBe(227);
}

[Fact]
public void Test6()
{
string[] lines = [
"89010123",
"78121874",
"87430965",
"96549874",
"45678903",
"32019012",
"01329801",
"10456732",
];

var input = lines.Select(l => l.ToCharArray().Select(c => (int)char.GetNumericValue(c)).ToArray()).ToArray();
var topographicMap = new TopographicMap(input);
var trailheadRatings = topographicMap.CalculateTrailheadRatings();
trailheadRatings.Count.ShouldBe(9);
trailheadRatings.Sum().ShouldBe(81);
}
}
26 changes: 26 additions & 0 deletions tests/day10tests/day10tests.csproj
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<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<TargetFramework>net9.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<IsPackable>false</IsPackable>
</PropertyGroup>

<ItemGroup>
<PackageReference Include="coverlet.collector" Version="6.0.0" />
<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
<PackageReference Include="Shouldly" Version="4.2.1" />
<PackageReference Include="xunit" Version="2.6.6" />
<PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
</ItemGroup>

<ItemGroup>
<Using Include="Xunit" />
</ItemGroup>

<ItemGroup>
<ProjectReference Include="..\..\day10\day10.csproj" />
</ItemGroup>

</Project>
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