add 개행문자

Author: hj4645

contains-duplicate/hj4645.py

@@ -7,4 +7,5 @@ def containsDuplicate(self, nums: List[int]) -> bool:
     # Time Complexity
     # - set(nums) → O(n)
     # - len(nums), len(set(nums)) → O(1)
-    # - Total: O(n) (n = number of list elements)
+    # - Total: O(n) (n = number of list elements)
+