ActivitySelection.Program.GetNotOverlappingActivities C# (CSharp) Метод

        private static List<Activity> GetNotOverlappingActivities(List<Activity> activities)
        {
            activities.Sort();

              var selectedActivities = new List<Activity>();

              Activity lastSelectedActivity = activities.First();

              selectedActivities.Add(lastSelectedActivity);

              for (int i = 1; i < activities.Count; i++)
              {
            Activity activity = activities[i];
            if (lastSelectedActivity.IsCompatible(activity))
            {
              selectedActivities.Add(activity);
              lastSelectedActivity = activity;
            }
              }

              return selectedActivities;
        }