C# Attempt: namespace Intermediate_WhereShouldGramasHouseGo { class Program { static void Main(string[] args) { decimal minDistance = 0; var list = new List<Point>(); var lines = File.ReadAllLines("input.txt").Skip(1).ToArray(); lines = cleanLines(lines);

        for (int i = 0; i < lines.Length; i++)
        {
            var pt1 = ExtractPointFromString(lines[i]);
            var pt2 = new Point();
            for (int j = i + 1; j < lines.Length; j++)
            {
                var success = false;
                pt2 = ExtractPointFromString(lines[j]);
                if (minDistance == 0)
                {
                    minDistance = Point.Distance(pt1, pt2);
                }
                else
                {
                    var tempDistance = Point.Distance(pt1, pt2);
                    if (tempDistance < minDistance)
                    {
                        minDistance = tempDistance;
                        success = true;
                    }
                }

                if (success)
                {
                    if (list.Count() == 0)
                    {
                        list.Add(pt1);
                        list.Add(pt2);
                    }
                    else
                    {
                        list.Clear();
                        list.Add(pt1);
                        list.Add(pt2);
                    }
                    success = false;
                }
            }
        }

        var s = String.Format("({0}, {1}) ({2}, {3})", list[0].X, list[0].Y, list[1].X, list[1].Y);
        Console.WriteLine(s);
        Console.ReadLine();
    }

    private static string[] cleanLines(string[] lines)
    {
        for (int i = 0; i < lines.Length; i++)
            lines[i] = lines[i].Substring(1, lines[i].Length - 2);
        return lines;
    }

    private static Point ExtractPointFromString(string str)
    {
        var temp = str.Split(',');                 
        return new Point(decimal.Parse(temp[0]), decimal.Parse(temp[1]));
    }

}

class Point
{
    public decimal X { get; private set; }
    public decimal Y { get; private set; }

    public Point()
    {
        X = 0;
        Y = 0;
    }

    public Point(decimal x, decimal y)
    {
        X = x;
        Y = y;
    }

    public static decimal Distance(Point pt1, Point pt2)
    {
        return (decimal)Math.Sqrt(Math.Pow((double)(pt1.X - pt1.Y), 2) + Math.Pow((double)(pt2.X - pt2.Y), 2));
    }
}

}