using System;
using System.Linq;
using System.Collections.Generic;
public class Test
{
	public static void Main()
	{

            // Initialise item weighting percentages
            Dictionary<string, int> weighting = new Dictionary<string, int>();
            weighting["A"] = 10; //10%
            weighting["B"] = 20; //20%
            weighting["C"] = 30; //30%
            weighting["D"] = 40; //40% (total = 100%)

            // Initialise data set used for each iteration
            Dictionary<string, int> data = new Dictionary<string, int>();

            // Initialise counts of the selected items
            Dictionary<string, int> count = new Dictionary<string, int>();
            count["A"] = 0;
            count["B"] = 0;
            count["C"] = 0;
            count["D"] = 0;

            Random rand = new Random();

            // Loop 5000 times
            for (int i = 0; i < 5000; i++) {

                // For each item, get a random number between 0 and 99
                // and multiply it by the percentage to get a
                // weighted random number.
                data["A"] = rand.Next(100) * weighting["A"];
                data["B"] = rand.Next(100) * weighting["B"];
                data["C"] = rand.Next(100) * weighting["C"];
                data["D"] = rand.Next(100) * weighting["D"];

                // Find which item came out on top and increment the count
                string sel = data.First(x => x.Value == data.Max(y => y.Value)).Key;
                count[sel]++;

                // Log, so you can see whats going on...
                if (i < 15)
                    Console.WriteLine("A:{0:00000}  B:{1:00000}  C:{2:00000}  D:{3:00000}  SELECTED:{4}",
                        data["A"], data["B"], data["C"], data["D"], sel);
                else if (i == 15) Console.WriteLine("...");

            }

            // Output the results, showing the percentage of the number
            // occurrances of each item.
            Console.WriteLine();
            Console.WriteLine("Results: ");
            Console.WriteLine("    A = {0}%", 100 * ((double)count["A"] / (double)count.Sum(z => z.Value)));
            Console.WriteLine("    B = {0}%", 100 * ((double)count["B"] / (double)count.Sum(z => z.Value)));
            Console.WriteLine("    C = {0}%", 100 * ((double)count["C"] / (double)count.Sum(z => z.Value)));
            Console.WriteLine("    D = {0}%", 100 * ((double)count["D"] / (double)count.Sum(z => z.Value)));
	}
}