part two completed

AdventOfCode2025/Cafeteria.cs

@@ -11,11 +11,12 @@ public class Cafeteria : IAdventSolution
 
         var ranges = new HashSet<Range>();
         var startIndex = 0;
-        while (lines[startIndex].Contains("-"))
+        while (lines[startIndex].Contains('-'))
         {
             var line = lines[startIndex++];
             var parts = line.Split('-');
-            ranges.Add(new(ulong.Parse(parts[0]), ulong.Parse(parts[1])));
+            var range = new Range(ulong.Parse(parts[0]), ulong.Parse(parts[1]));
+            AddRange(ranges, range);
         }
         
         var fresh = 0;
@@ -26,10 +27,54 @@ public class Cafeteria : IAdventSolution
                 continue;
 
             var num = ulong.Parse(line);
-            if(ranges.Any(x => x.Min <= num && num <= x.Max)) fresh++;
+            if(ranges.Any(x => x.IsInRange(num))) fresh++;
+        }
+        RemoveExtraRanges(ranges);
+        var totalFresh = 0UL;
+        foreach (var range in ranges)
+            totalFresh += range.InclusiveCount;
+        
+        return new AdventSolution(fresh.ToString(), totalFresh.ToString());
+    }
+
+    private void AddRange(HashSet<Range> ranges, Range range)
+    {
+        var first = ranges.FirstOrDefault(x => x.IsInRange(range.Min));
+        if (first != default)
+        {
+            ranges.Remove(first);
+            if(!first.IsInRange(range.Max)) 
+                first =  new Range(first.Min, range.Max);
+        }
+        else
+            first = range;
+        
+        var last = ranges.LastOrDefault(x => x.IsInRange(first.Max));
+        if (last != default)
+        {
+            ranges.Remove(last);
+            if (!last.IsInRange(first.Min))
+                last = new Range(first.Min,  last.Max);
+        }
+        else
+            last = first;
+        
+        ranges.Add(last);
+    }
+
+    private void RemoveExtraRanges(HashSet<Range> ranges)
+    {
+        var toRemove = new List<Range>();
+        foreach (var range in ranges)
+        {
+            if(ranges.Any(x => x != range && (x.IsInRange(range.Min) || x.IsInRange(range.Max))))
+                toRemove.Add(range);
         }
 
-        
-        return new AdventSolution(fresh.ToString(), null);
+        foreach (var remove in toRemove)
+        {
+            ranges.Remove(remove);
+            AddRange(ranges, remove);
+        }
     }
 }

AdventOfCode2025/Program.cs

@@ -14,5 +14,5 @@ AdventSolver<Lobby>.Solve(dayThreeInput, 3, "Lobby");
 var dayFourInput = await File.ReadAllTextAsync("./Input/DayFour.txt");
 AdventSolver<PrintingDepartment>.Solve(dayFourInput, 4, "Printing Department");
 
-var dayFiveInput = await File.ReadAllTextAsync("./Input/Test.txt");
+var dayFiveInput = await File.ReadAllTextAsync("./Input/DayFive.txt");
 AdventSolver<Cafeteria>.Solve(dayFiveInput, 4, "Cafeteria");