gistfile1.txt

		public static Dictionary<string, List<string>> ConvertToDictionaryOptimized(List<Tuple> actorMovies)
		{
			var result = new Dictionary<string, List<string>>();

			foreach (Tuple actorMovie in actorMovies)
			{
				if (result.ContainsKey(actorMovie.Actor))
				{
					var movies = result[actorMovie.Actor];
					movies.Add(actorMovie.Movie);
				}
				else
				{
					result.Add(actorMovie.Actor, new List<string> {actorMovie.Movie});
				}
			}

			return result;
		}

		public static Dictionary<string, List<string>> ConvertToDictionary(List<Tuple> actorMovies)
		{
			var result = new Dictionary<string, List<string>>();

			foreach (Tuple actorMovie in actorMovies)
			{
				if (result.ContainsKey(actorMovie.Actor)) continue;

				IEnumerable<Tuple> tempActors = actorMovies.Where(a => a.Actor == actorMovie.Actor);
				List<string> movies = tempActors.Select(actor => actor.Movie).ToList();
				result.Add(actorMovie.Actor, movies);
			}

			return result;
		}