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Extract `Combinations` method to `AdventOfCode.Extensions` and refactor usages to improve modularity and reduce duplication

This commit is contained in:
Sebastian Lindemeier 2025-12-12 12:35:01 +01:00
parent d92293f631
commit d0b612154a
7 changed files with 75 additions and 69 deletions
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9
AdventOfCode.Extensions/AdventOfCode.Extensions.csproj Normal file
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@ -0,0 +1,9 @@
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net9.0</TargetFramework>
<ImplicitUsings>disable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

52
AdventOfCode.Extensions/EnumerableExtensions.cs Normal file
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@ -0,0 +1,52 @@
using System;
using System.Collections.Generic;
using System.Linq;
namespace AdventOfCode.Extensions;
public static class EnumerableExtensions
{
public static IEnumerable<TValue[]> Combinations<TValue>(this IEnumerable<TValue> values, int count)
{
var pool = values.ToArray();
var poolLength = pool.Length;
if (count > poolLength)
yield break;
var indices = Range(0, count).ToArray();
yield return GetCombination(indices, pool);
while (true)
{
var validIndex = false;
var currentIndex = 0;
foreach (var i in Range(0, count).Reverse())
{
currentIndex = i;
if (indices[i] != i + poolLength - count)
{
validIndex = true;
break;
}
}
if(!validIndex)
yield break;
indices[currentIndex] += 1;
foreach (var j in Range(currentIndex + 1, count))
{
Index ix = j - 1;
indices[j] = indices[ix] + 1;
}
yield return GetCombination(indices, pool);
}
static TValue[] GetCombination(int[] innerIndices, TValue[] innerPool) =>
innerIndices.Select(i => innerPool[i]).ToArray();
static IEnumerable<int> Range(int start, int end)
{
for (var i = start; i < end; i++)
yield return i;
}
}
}

6
AdventOfCode.sln
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@ -10,6 +10,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AoC_2025.Runner", "AoC_2025
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdvenOfCode.Contracts", "AdvenOfCode.Contracts\AdvenOfCode.Contracts.csproj", "{0249A329-D5C1-4699-88BE-A668B362432E}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdventOfCode.Extensions", "AdventOfCode.Extensions\AdventOfCode.Extensions.csproj", "{1466A0F6-7C88-47FF-B8F8-FF30368E26DC}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@ -32,6 +34,10 @@ Global
{0249A329-D5C1-4699-88BE-A668B362432E}.Debug|Any CPU.Build.0 = Debug|Any CPU
{0249A329-D5C1-4699-88BE-A668B362432E}.Release|Any CPU.ActiveCfg = Release|Any CPU
{0249A329-D5C1-4699-88BE-A668B362432E}.Release|Any CPU.Build.0 = Release|Any CPU
{1466A0F6-7C88-47FF-B8F8-FF30368E26DC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{1466A0F6-7C88-47FF-B8F8-FF30368E26DC}.Debug|Any CPU.Build.0 = Debug|Any CPU
{1466A0F6-7C88-47FF-B8F8-FF30368E26DC}.Release|Any CPU.ActiveCfg = Release|Any CPU
{1466A0F6-7C88-47FF-B8F8-FF30368E26DC}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(NestedProjects) = preSolution
{4F395AE3-DABB-4546-A4D0-5A62425FE168} = {05EBAA1C-B33B-4AFE-8635-A58D7CA509A7}

1
AoC_2025/AoC_2025.csproj
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@ -8,6 +8,7 @@
<ItemGroup>
<ProjectReference Include="..\AdvenOfCode.Contracts\AdvenOfCode.Contracts.csproj" />
<ProjectReference Include="..\AdventOfCode.Extensions\AdventOfCode.Extensions.csproj" />
</ItemGroup>
<ItemGroup>

15
AoC_2025/Day08.cs
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@ -4,6 +4,7 @@ using System.Data.Common;
using System.IO;
using System.Linq;
using AdvenOfCode.Contracts;
using AdventOfCode.Extensions;
using Coordinate = (long x, long y, long z);
namespace AoC_2025;
@ -92,21 +93,11 @@ public class Day08 : IPuzzleSolver<long>
private IEnumerable<(Coordinate boxA, Coordinate boxB)> GetAllCombinationsSortedByDistance(IEnumerable<Coordinate> jBoxes)
{
var combinations = Combinations(jBoxes)
var combinations = jBoxes.Combinations(2)
.Select(x => (a: x[0], b: x[1]))
.OrderBy(x => GetDistance(x.a, x.b));
return combinations;
}
private IEnumerable<(TValue a, TValue b)> Combinations<TValue>(IEnumerable<TValue> values)
{
var enumeratedValues = values.Index().ToArray();
var pairs =
from a in enumeratedValues
from b in enumeratedValues
where a.Index < b.Index
select (a.Item, b.Item);
return pairs;
}
private long MultiplyLargestCircuitLength(List<HashSet<Coordinate>> circuits, int amountMultiply)
{

14
AoC_2025/Day09.cs
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@ -4,6 +4,7 @@ using System.Data.Common;
using System.IO;
using System.Linq;
using AdvenOfCode.Contracts;
using AdventOfCode.Extensions;
using Coordinate = (long x, long y);
using CoordinatePair = (long minX, long minY, long maxX, long maxY);
@ -54,7 +55,7 @@ public class Day09 : IPuzzleSolver<long>
private IEnumerable<CoordinatePair> GetAllPossibleRectanglesAsPairs(Coordinate[] redTiles)
{
return Combinations(redTiles).Select(x => AsPair(x.a, x.b));
return redTiles.Combinations(2).Select(x => AsPair(x[0], x[1]));
}
private CoordinatePair[] GetBordersAsPairs(Coordinate[] redTiles)
@ -84,17 +85,6 @@ public class Day09 : IPuzzleSolver<long>
return (Math.Abs(tileA.x - tileB.x) + 1) * (Math.Abs(tileA.y - tileB.y) + 1);
}
private IEnumerable<(TValue a, TValue b)> Combinations<TValue>(IEnumerable<TValue> values)
{
var enumeratedValues = values.Index().ToArray();
var pairs =
from a in enumeratedValues
from b in enumeratedValues
where a.Index < b.Index
select (a.Item, b.Item);
return pairs;
}
private IEnumerable<(Coordinate a, Coordinate b)> GetBorders(Coordinate[] tiles)
{
return tiles.Zip([..tiles[1..], tiles[0]], (a, b) => (a, b));

47
AoC_2025/Day10.cs
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@ -6,6 +6,7 @@ using System.Data.Common;
using System.IO;
using System.Linq;
using AdvenOfCode.Contracts;
using AdventOfCode.Extensions;
using Microsoft.Z3;
namespace AoC_2025;
@ -214,7 +215,7 @@ public class Day10 : IPuzzleSolver<long>
yield return ([..Enumerable.Repeat(0, patternLength)], 0);
for (var i = 1; i <= buttons.Length; i++)
{
foreach (var buttonPattern in Combinations(buttons, i))
foreach (var buttonPattern in buttons.Combinations(i))
{
var joltageLevels = GetJoltageLevelsForButtonPattern(patternLength, buttonPattern);
yield return (joltageLevels, buttonPattern.Length);
@ -271,50 +272,6 @@ public class Day10 : IPuzzleSolver<long>
var answer = answerExpression is IntNum number ? number.Int64 : 0;
return answer;
}
private IEnumerable<TValue[]> Combinations<TValue>(IEnumerable<TValue> values, int count)
{
var pool = values.ToArray();
var poolLength = pool.Length;
if (count > poolLength)
yield break;
var indices = Range(0, count).ToArray();
yield return GetCombination(indices, pool);
while (true)
{
var validIndex = false;
var currentIndex = 0;
foreach (var i in Range(0, count).Reverse())
{
currentIndex = i;
if (indices[i] != i + poolLength - count)
{
validIndex = true;
break;
}
}
if(!validIndex)
yield break;
indices[currentIndex] += 1;
foreach (var j in Range(currentIndex + 1, count))
{
Index ix = j - 1;
indices[j] = indices[ix] + 1;
}
yield return GetCombination(indices, pool);
}
static TValue[] GetCombination(int[] innerIndices, TValue[] innerPool) =>
innerIndices.Select(i => innerPool[i]).ToArray();
static IEnumerable<int> Range(int start, int end)
{
for (var i = start; i < end; i++)
yield return i;
}
}
}
public class IntArrayEqualityComparer : IEqualityComparer<int[]>