From 411672d8c31e512fa5f15c94dc4169191457c9b1 Mon Sep 17 00:00:00 2001
From: Sebastian Lindemeier <lindemeier.sebastian@bgetem.de>
Date: Tue, 9 Dec 2025 11:41:41 +0100
Subject: [PATCH] Refactor Day08 and Day09 to update collection types and
 method names for improved consistency and clarity

---
 AoC_2025/Day08.cs | 14 +++++++-------
 AoC_2025/Day09.cs |  6 +++---
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/AoC_2025/Day08.cs b/AoC_2025/Day08.cs
index 5fde7e2..5f1bcef 100644
--- a/AoC_2025/Day08.cs
+++ b/AoC_2025/Day08.cs
@@ -44,12 +44,12 @@ public class Day08 : IPuzzleSolver<long>
         return lastConnected.a.x * lastConnected.b.x;
     }
     
-    private List<List<Coordinate>> CreateCircuits(IEnumerable<Coordinate> jBoxes)
+    private List<HashSet<Coordinate>> CreateCircuits(IEnumerable<Coordinate> jBoxes)
     {
-        return jBoxes.Select(p => new List<Coordinate> { p }).ToList();
+        return jBoxes.Select(p => new HashSet<Coordinate> { p }).ToList();
     }
     
-    private List<List<Coordinate>> CombineCircuits(List<List<Coordinate>> circuits,
+    private List<HashSet<Coordinate>> CombineCircuits(List<HashSet<Coordinate>> circuits,
         IEnumerable<(Coordinate boxA, Coordinate boxB)> jBoxPairs, int amountToConnect)
     {
         circuits = jBoxPairs
@@ -58,7 +58,7 @@ public class Day08 : IPuzzleSolver<long>
         return circuits;
     }
 
-    private (Coordinate a, Coordinate b) LastCombinedConnectAllCircuits(List<List<Coordinate>> circuits,
+    private (Coordinate a, Coordinate b) LastCombinedConnectAllCircuits(List<HashSet<Coordinate>> circuits,
         IEnumerable<(Coordinate boxA, Coordinate boxB)> jBoxPairs)
     {
         foreach (var jBoxPair in jBoxPairs)
@@ -75,7 +75,7 @@ public class Day08 : IPuzzleSolver<long>
         return (a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y) + (a.z - b.z) * (a.z - b.z);
     }
 
-    private List<List<Coordinate>> ConnectJBoxes(Coordinate a, Coordinate b, List<List<Coordinate>> circuits)
+    private List<HashSet<Coordinate>> ConnectJBoxes(Coordinate a, Coordinate b, List<HashSet<Coordinate>> circuits)
     {
         var circuitToAddBTo = circuits.First(circuit => circuit.Contains(a));
         var circuitToAddATo = circuits.First(circuit => circuit.Contains(b));
@@ -85,7 +85,7 @@ public class Day08 : IPuzzleSolver<long>
             return circuits;
         }
 
-        circuitToAddBTo.AddRange(circuitToAddATo);
+        circuitToAddBTo.UnionWith(circuitToAddATo);
         circuits.Remove(circuitToAddATo);
         return circuits;
     }
@@ -108,7 +108,7 @@ public class Day08 : IPuzzleSolver<long>
         return pairs;
     }
     
-    private long MultiplyLargestCircuitLength(List<List<Coordinate>> circuits, int amountMultiply)
+    private long MultiplyLargestCircuitLength(List<HashSet<Coordinate>> circuits, int amountMultiply)
     {
         return circuits
             .Select(circuit => (long)circuit.Count)
diff --git a/AoC_2025/Day09.cs b/AoC_2025/Day09.cs
index 3775f10..5d3c543 100644
--- a/AoC_2025/Day09.cs
+++ b/AoC_2025/Day09.cs
@@ -54,12 +54,12 @@ public class Day09 : IPuzzleSolver<long>
 
     private IEnumerable<CoordinatePair> GetAllPossibleRectanglesAsPairs(Coordinate[] redTiles)
     {
-        return Combinations(redTiles).Select(x => AsMinMax(x.a, x.b));
+        return Combinations(redTiles).Select(x => AsPair(x.a, x.b));
     }
 
     private CoordinatePair[] GetBordersAsPairs(Coordinate[] redTiles)
     {
-        return GetBorders(redTiles).Select(x => AsMinMax(x.a, x.b)).ToArray();
+        return GetBorders(redTiles).Select(x => AsPair(x.a, x.b)).ToArray();
     }
 
     private bool IsRectangleInsideBorders(CoordinatePair[] borders, CoordinatePair rectangle)
@@ -67,7 +67,7 @@ public class Day09 : IPuzzleSolver<long>
         return !borders.Any(border => RectangleCrossesBorder(rectangle, border));
     }
 
-    private CoordinatePair AsMinMax(Coordinate a, Coordinate b)
+    private CoordinatePair AsPair(Coordinate a, Coordinate b)
     {
         return (Math.Min(a.x, b.x), Math.Min(a.y, b.y), Math.Max(a.x, b.x), Math.Max(a.y, b.y));
     }