[LC] contains-duplicate

Author: BEMELON

contains-duplicate/bemelon.py

@@ -0,0 +1,10 @@
+class Solution:
+    def containsDuplicate(self, nums: List[int]) -> bool:
+        # Time Complexity: O(n)
+        # Space Complexity: O(n)
+        seen = set()
+        for num in nums:
+            if num in seen:
+                return True 
+            seen.add(num)
+        return False