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

public class Test
{
	public static void Main()
	{
	var data = new int[] { 1, 1, 2, 1 };
	
	var results = Enumerable.Range(0, data.Count ())
		.Where (i => i == 0 || data.ElementAt(i - 1) != data.ElementAt(i))
		.Select (i => new
	                  {
			//Key = data.ElementAt(i),
			Group = Enumerable.Repeat(data.ElementAt(i), 
				data.Skip(i)
                                .TakeWhile (d => d == data.ElementAt(i)).Count ())
	                  }
			     );
		
		foreach(var item in results)
		{
			Console.Write("[");
			foreach(var num in item.Group)
				Console.Write(string.Format("{0} ", num));
			Console.WriteLine("]");
		}
  	}
}