13 AvrLoadTime

using System;
using System.Collections.Generic;
using System.Linq;

class AvrLoadTimeCalc
{
    static void Main(string[] args)
    {
        List<string> matrix = new List<string>();

        string line = " ";
        string skipLine = " ";
        while (line != string.Empty)
        {
            line = Console.ReadLine();
            if(line != "")
            matrix.Add(line);
        }

        List<string> webSites = new List<string>();

        for (int i = 0; i < matrix.Count; i++)
        {
            String[] values = matrix[i].Split(' ');
            webSites.Add(values[2]);
        }

        List<string> printWebSite = new List<string>();

        for (int i = 0; i < webSites.Count; i++)
        {
            if (!printWebSite.Contains(webSites[i]))
            {
                printWebSite.Add(webSites[i]);
            }
        }

        double counter = 0;
        double time = 0;

        for (int i = 0; i < printWebSite.Count; i++)
        {
            for (int j = 0; j < webSites.Count; j++)
            {
                if (webSites[i] == webSites[j])
                {
                    String[] values = matrix[j].Split(new Char[] { ' ' });
                    time += double.Parse(values[3]);
                    counter++;
                }
            }
            Console.WriteLine("{0} -> {1}", printWebSite[i], time / counter);
            counter = 0;
            time = 0;
        }
    }
}