contains duplicate- after review

Author: deepInTheWoodz

contains-duplicate/deepInTheWoodz.py

@@ -4,6 +4,6 @@ def containsDuplicate(self, nums: List[int]) -> bool:
     for num in nums:
       if num in s:
         return True
-      else:
-        s.add(num)
-    return False
+      s.add(num)
+    return False
+