Day 11 part 1

Day11/GridPoint.cs

@@ -6,4 +6,10 @@ public record GridPoint(int X, int Y)
     {
         return new GridPoint(X + other.X, Y + other.Y);
     }
+
+    public int Distance(GridPoint other)
+    {
+        return Math.Abs(X - other.X)
+               + Math.Abs(Y - other.Y);
+    }
 }

Day11/Program.cs

@@ -24,4 +24,8 @@ foreach (var g in universe.Galaxies)
     Console.WriteLine($"{g.Id}: {g.Position.X} / {g.Position.Y}");
 }
 
+var distance = universe.GetTotalDistance();
+Console.WriteLine();
+Console.WriteLine($"Total Distance: {distance}");
+
 return 0;

Day11/Universe.cs

@@ -60,4 +60,28 @@ public class Universe
             }
         }
     }
+
+    public long GetTotalDistance()
+    {
+        var sum = 0;
+        foreach (var pair in BuildPairs())
+        {
+            var distance = pair.Left.Position.Distance(pair.Right.Position);
+            Console.WriteLine($"{pair.Left.Id} <-> {pair.Right.Id} = {distance}");
+            sum += distance;
+        }
+
+        return sum;
+    }
+
+    private IEnumerable<(Galaxy Left, Galaxy Right)> BuildPairs()
+    {
+        for (var i = 0; i < Galaxies.Count - 1; i++)
+        {
+            for (var j = i + 1; j < Galaxies.Count; j++)
+            {
+                yield return (Galaxies[i], Galaxies[j]);
+            }
+        }
+    }
 }

Day11/inputs/input-lar.txt

@@ -0,0 +1,140 @@
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