add teaching feature

problem/urls/admin.py

@@ -4,6 +4,7 @@ from ..views.admin import (
     ContestProblemAPI,
     ProblemAPI,
     ProblemFlowchartAIGen,
+    StuckProblemsAPI,
     TestCaseAPI,
     MakeContestProblemPublicAPIView,
     AddContestProblemAPI,
@@ -14,6 +15,7 @@ urlpatterns = [
     path("test_case", TestCaseAPI.as_view()),
     path("problem", ProblemAPI.as_view()),
     path("problem/visible", ProblemVisibleAPI.as_view()),
+    path("problem/stuck", StuckProblemsAPI.as_view()),
     path("problem/flowchart", ProblemFlowchartAIGen.as_view()),
     path("contest/problem", ContestProblemAPI.as_view()),
     path("contest_problem/make_public", MakeContestProblemPublicAPIView.as_view()),