feat: 217. Contains Duplicate

Author: HodaeSsi

contains-duplicate/hodaessi.py

@@ -0,0 +1,10 @@
+from typing import List
+
+class Solution:
+    def containsDuplicate(self, nums: List[int]) -> bool:
+        dict = {}
+        for num in nums:
+            dict[num] = dict.get(num, 0) + 1
+            if dict[num] > 1:
+                return True
+        return False