Fix bug

judge/contest_format/base.py

@@ -11,14 +11,13 @@ class abstractclassmethod(classmethod):
 
 
 class BaseContestFormat(metaclass=ABCMeta):
+    has_hidden_subtasks = False
+
     @abstractmethod
     def __init__(self, contest, config):
         self.config = config
         self.contest = contest
 
-        # Use in ioi16 to display ranking with hidden subtasks
-        self.has_hidden_subtasks = False
-
     @abstractproperty
     def name(self):
         """

judge/contest_format/new_ioi.py

@@ -10,14 +10,11 @@ from judge.timezone import from_database_time, to_database_time
 class NewIOIContestFormat(IOIContestFormat):
     name = gettext_lazy("New IOI")
     config_defaults = {"cumtime": False}
+    has_hidden_subtasks = True
     """
         cumtime: Specify True if time penalties are to be computed. Defaults to False.
     """
 
-    def __init__(self, contest, config):
-        super().__init__(contest, config)
-        self.has_hidden_subtasks = True
-
     def get_hidden_subtasks(self):
         queryset = self.contest.contest_problems.values_list("id", "hidden_subtasks")
         res = {}