后端比赛与比赛题目部分已修改完成

contest/migrations/0003_contestproblem_difficulty.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contest', '0002_contest_visible'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='contestproblem',
+            name='difficulty',
+            field=models.IntegerField(default=1),
+            preserve_default=False,
+        ),
+    ]