From 3d305d80bf4deb2d798948285101c9064b7104fa Mon Sep 17 00:00:00 2001
From: Sebastian Lindemeier <lindemeier.sebastian@bgetem.de>
Date: Thu, 11 Dec 2025 08:55:02 +0100
Subject: [PATCH] Refactor Day11 to handle missing paths in `paths` dictionary
 and improve variable usage readability

---
 AoC_2025/Day11.cs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/AoC_2025/Day11.cs b/AoC_2025/Day11.cs
index 2df206e..8cd75e5 100644
--- a/AoC_2025/Day11.cs
+++ b/AoC_2025/Day11.cs
@@ -39,9 +39,10 @@ public class Day11 : IPuzzleSolver<long>
     {
         if (from == to) return 1;
         if (memory.TryGetValue((from, to), out var res)) return res;
+        if (!paths.TryGetValue(from, out var pathsToCheck)) return 0;
         
         var totalAmount = 0L;
-        foreach (var path in paths[from])
+        foreach (var path in pathsToCheck)
         {
             var amount = GetAmountPaths(path, to, paths, memory);
             memory[(path, to)] = amount;
@@ -59,9 +60,10 @@ public class Day11 : IPuzzleSolver<long>
         through.Remove(from);
         if (from == to) return through.Count == 0 ? 1 : 0;
         if (memory.TryGetValue((from, to), out var res) && res.Item2.SetEquals(through)) return res.Item1;
+        if (!paths.TryGetValue(from, out var pathsToCheck)) return 0;
         
         var totalAmount = 0L;
-        foreach (var path in paths[from])
+        foreach (var path in pathsToCheck)
         {
             var amount = GetAmountPathsThrough(path, to, [..through], paths, memory);
             memory[(path, to)] = (amount, through);