using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {       

        var results = DistributionService.Process(20, new Dictionary<string, double>(){

            { "A", .25 },

            { "B", .25 },

            { "C", .50 }

        });

        Console.WriteLine("Results count: {0}", results.Count());

        Console.WriteLine(string.Join("\n", results.Select(x => x.Name)));

    }

    public class DistributionService

    {   

        public static IEnumerable<DistributionItem> Process(int slots, Dictionary<string, double> distributions)

        {

            if(distributions.Sum(x => x.Value) != 1)

            {

                throw new ArgumentException("Values must equal 100%");

            }

            List<DistributionItem> items = new List<DistributionItem>();

            foreach(var d in distributions)

            {

                int count = (int)(slots * d.Value);

                for(int i = 0; i < count; i++)

                {

                    items.Add(new DistributionItem(d.Key));

                }

            }

            return Shuffle(items);

        }

        public static List<DistributionItem> Shuffle(List<DistributionItem> list)  

        {  

            Random rng = new Random(0); 

            int n = list.Count;  

            while (n > 1) {  

                n--;  

                int k = rng.Next(n + 1);  

                DistributionItem value = list[k];  

                list[k] = list[n];  

                list[n] = value;  

            }  

            return list;

        }

    }

    public class DistributionItem

    {

        public string Name { get; set; }

        public DistributionItem(string name)

        {

            Name = name;

        }

    }

}