chore: 删除没必要的header

lucifer · lucifer · commit f36fd58aaa95 · 2020-01-20T14:22:54.000+08:00
diff --git a/problems/380.insert-delete-getrandom-o1.md b/problems/380.insert-delete-getrandom-o1.md
@@ -139,5 +139,3 @@ class RandomizedSet:
 # param_2 = obj.remove(val)
 # param_3 = obj.getRandom()
 ```
-
-## 相关题目
