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csharp/adventOfCode/day9/Day9.cs

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+using System.Runtime.InteropServices;
+using System.Runtime.Serialization;
+
+namespace adventOfCode.day9;
+
+record Point(long X, long Y)
+{
+    public static Point ParseLine(string line)
+    {
+        var x = line.Split(",");
+        return new Point(long.Parse(x[0]), long.Parse(x[1]));
+    }
+    
+
+    public static long Dist(Point p1, Point p2)
+    {
+        return (Math.Abs(p1.X - p2.X) + 1) * (Math.Abs(p1.Y - p2.Y) + 1);
+    }
+}
+
+record Rectangle(Point C1, Point C2)
+{
+  
+
+
+  
+}
+
+public class Day9
+{
+    static List<Point> ParseInput(string document)
+    {
+        return (from line in document.Split("\n") select Point.ParseLine(line)).ToList();
+    }
+
+    static IEnumerable<Tuple<Point, Point>> AllPairs(List<Point> points)
+    {
+        for (var i = 0; i < points.Count; i++)
+        {
+            for (var j = i + 1; j < points.Count; j++)
+            {
+                yield return new Tuple<Point, Point>(points[i], points[j]);
+            }
+        }
+    }
+
+    static long Question9A(string document)
+    {
+        var points = ParseInput(document);
+        return (from pair in AllPairs(points) select Point.Dist(pair.Item1, pair.Item2)).Max();
+    }
+
+    static long Question9B(string document)
+    {
+        var points = ParseInput(document);
+        var pairs = from pair in AllPairs(points) orderby  Point.Dist(pair.Item1, pair.Item2) descending select pair;
+        foreach (var pair in pairs)
+        {
+            // if 
+            
+        }
+        return 23;
+
+    }
+    
+    public static void Main_()
+    {
+        Console.WriteLine($"Answer to question 9a is: {Question9A(Inputs.Input)}");
+        
+    }
+}