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

public class Test
{
	public static void Main()
	{
		var sw = new Stopwatch();
                int many = 10000000;
                var manyDoubles = new List<double>(many);
                var range = Enumerable.Range(1, many).Select(i => (double)i);
                
		var orderFirst = manyDoubles.OrderBy(d => d).Distinct();
                sw.Start();
                manyDoubles.AddRange(orderFirst);
                sw.Stop();
                Console.WriteLine("Time for first orderby then distinct: {0}", sw.Elapsed.ToString());
		manyDoubles = new List<double>(many);
                
		var distinctFirst = manyDoubles.Distinct().OrderBy(d => d);
                sw.Reset();
               	sw.Start();
                manyDoubles.AddRange(distinctFirst);
                sw.Stop();
                Console.WriteLine("Time for first distinct then orderby: {0}", sw.Elapsed.ToString());
	}
}