diff --git a/contest/views/admin.py b/contest/views/admin.py
index b94acda..6cdf49a 100644
--- a/contest/views/admin.py
+++ b/contest/views/admin.py
@@ -6,6 +6,8 @@ from ipaddress import ip_network
 import dateutil.parser
 from django.http import FileResponse
 
+from problem.models import Problem
+
 from account.decorators import super_admin_required
 from account.models import User
 from submission.models import Submission, JudgeStatus
@@ -15,10 +17,15 @@ from utils.constants import CacheKey
 from utils.shortcuts import rand_str
 from utils.tasks import delete_files
 from ..models import Contest, ContestAnnouncement, ACMContestRank
-from ..serializers import (ContestAnnouncementSerializer, ContestAdminSerializer,
-                           CreateConetestSeriaizer, CreateContestAnnouncementSerializer,
-                           EditConetestSeriaizer, EditContestAnnouncementSerializer,
-                           ACMContesHelperSerializer, )
+from ..serializers import (
+    ContestAnnouncementSerializer,
+    ContestAdminSerializer,
+    CreateConetestSeriaizer,
+    CreateContestAnnouncementSerializer,
+    EditConetestSeriaizer,
+    EditContestAnnouncementSerializer,
+    ACMContesHelperSerializer,
+)
 
 
 class ContestAPI(APIView):
@@ -84,7 +91,9 @@ class ContestAPI(APIView):
         keyword = request.GET.get("keyword")
         if keyword:
             contests = contests.filter(title__contains=keyword)
-        return self.success(self.paginate_data(request, contests, ContestAdminSerializer))
+        return self.success(
+            self.paginate_data(request, contests, ContestAdminSerializer)
+        )
 
 
 class ContestAnnouncementAPI(APIView):
@@ -138,19 +147,29 @@ class ContestAnnouncementAPI(APIView):
         contest_announcement_id = request.GET.get("id")
         if contest_announcement_id:
             try:
-                contest_announcement = ContestAnnouncement.objects.get(id=contest_announcement_id)
-                return self.success(ContestAnnouncementSerializer(contest_announcement).data)
+                contest_announcement = ContestAnnouncement.objects.get(
+                    id=contest_announcement_id
+                )
+                return self.success(
+                    ContestAnnouncementSerializer(contest_announcement).data
+                )
             except ContestAnnouncement.DoesNotExist:
                 return self.error("Contest announcement does not exist")
 
         contest_id = request.GET.get("contest_id")
         if not contest_id:
             return self.error("Parameter error")
-        contest_announcements = ContestAnnouncement.objects.filter(contest_id=contest_id)
+        contest_announcements = ContestAnnouncement.objects.filter(
+            contest_id=contest_id
+        )
         keyword = request.GET.get("keyword")
         if keyword:
-            contest_announcements = contest_announcements.filter(title__contains=keyword)
-        return self.success(ContestAnnouncementSerializer(contest_announcements, many=True).data)
+            contest_announcements = contest_announcements.filter(
+                title__contains=keyword
+            )
+        return self.success(
+            ContestAnnouncementSerializer(contest_announcements, many=True).data
+        )
 
 
 class ACMContestHelper(APIView):
@@ -163,21 +182,32 @@ class ACMContestHelper(APIView):
             contest = Contest.objects.get(id=contest_id, visible=True)
         except Contest.DoesNotExist:
             return self.error("Contest does not exist")
-        
-        ranks = ACMContestRank.objects.filter(contest=contest, accepted_number__gt=0) \
-            .values("id", "user__username", "user__userprofile__real_name", "submission_info")
+
+        problems = Problem.objects.filter(contest=contest).values("id", "_id")
+        problem_id_map = {str(p["id"]): p["_id"] for p in problems}
+
+        ranks = ACMContestRank.objects.filter(
+            contest=contest, accepted_number__gt=0
+        ).values(
+            "id", "user__username", "user__userprofile__real_name", "submission_info"
+        )
         results = []
         for rank in ranks:
             for problem_id, info in rank["submission_info"].items():
                 if info["is_ac"]:
-                    results.append({
-                        "id": rank["id"],
-                        "username": rank["user__username"],
-                        "real_name": rank["user__userprofile__real_name"],
-                        "problem_id": problem_id,
-                        "ac_info": info,
-                        "checked": info.get("checked", False)
-                    })
+                    results.append(
+                        {
+                            "id": rank["id"],
+                            "username": rank["user__username"],
+                            "real_name": rank["user__userprofile__real_name"],
+                            "problem_id": problem_id,
+                            "problem_display_id": problem_id_map.get(
+                                problem_id, problem_id
+                            ),
+                            "ac_info": info,
+                            "checked": info.get("checked", False),
+                        }
+                    )
         results.sort(key=lambda x: -x["ac_info"]["ac_time"])
         return self.success(results)
 
@@ -202,7 +232,9 @@ class DownloadContestSubmissions(APIView):
         problem_ids = contest.problem_set.all().values_list("id", "_id")
         id2display_id = {k[0]: k[1] for k in problem_ids}
         ac_map = {k[0]: False for k in problem_ids}
-        submissions = Submission.objects.filter(contest=contest, result=JudgeStatus.ACCEPTED).order_by("-create_time")
+        submissions = Submission.objects.filter(
+            contest=contest, result=JudgeStatus.ACCEPTED
+        ).order_by("-create_time")
         user_ids = submissions.values_list("user_id", flat=True)
         users = User.objects.filter(id__in=user_ids)
         path = f"/tmp/{rand_str()}.zip"
@@ -216,11 +248,15 @@ class DownloadContestSubmissions(APIView):
                     problem_id = submission.problem_id
                     if user_ac_map[problem_id]:
                         continue
-                    file_name = f"{user.username}_{id2display_id[submission.problem_id]}.txt"
+                    file_name = (
+                        f"{user.username}_{id2display_id[submission.problem_id]}.txt"
+                    )
                     compression = zipfile.ZIP_DEFLATED
-                    zip_file.writestr(zinfo_or_arcname=f"{file_name}",
-                                      data=submission.code,
-                                      compress_type=compression)
+                    zip_file.writestr(
+                        zinfo_or_arcname=f"{file_name}",
+                        data=submission.code,
+                        compress_type=compression,
+                    )
                     user_ac_map[problem_id] = True
         return path
 
@@ -239,5 +275,7 @@ class DownloadContestSubmissions(APIView):
         delete_files.send_with_options(args=(zip_path,), delay=300_000)
         resp = FileResponse(open(zip_path, "rb"))
         resp["Content-Type"] = "application/zip"
-        resp["Content-Disposition"] = f"attachment;filename={os.path.basename(zip_path)}"
+        resp["Content-Disposition"] = (
+            f"attachment;filename={os.path.basename(zip_path)}"
+        )
         return resp
diff --git a/problem/views/admin.py b/problem/views/admin.py
index 414bb8d..8854a53 100644
--- a/problem/views/admin.py
+++ b/problem/views/admin.py
@@ -489,7 +489,6 @@ class MakeContestProblemPublicAPIView(APIView):
             return self.error("Already be a public problem")
         problem.is_public = True
         problem.save()
-        # https://docs.djangoproject.com/en/1.11/topics/db/queries/#copying-model-instances
         tags = problem.tags.all()
         problem.pk = None
         problem.contest = None