Fix: contains-duplicate 누락 개행 추가

Author: o-ddong

contains-duplicate/oddong.py

@@ -1,3 +1,3 @@
 class Solution:
     def containsDuplicate(self, nums: List[int]) -> bool:
-        return len(nums) != len(set(nums))
+        return len(nums) != len(set(nums))