每次有判题任务完成的时候，递归调用自己判断还有没有等待的任务

submission/views.py

@@ -13,7 +13,7 @@ from problem.models import Problem
 from contest.models import ContestProblem, Contest
 from contest.decorators import check_user_contest_permission
 from utils.shortcuts import serializer_invalid_response, error_response, success_response, error_page, paginate
-from .task import _judge
+from .tasks import _judge
 from .models import Submission
 from .serializers import (CreateSubmissionSerializer, SubmissionSerializer,
                           SubmissionhareSerializer, SubmissionRejudgeSerializer,