solve: contains-duplicate

Author: coloryourlife

contains-duplicate/Raft.py

@@ -0,0 +1,10 @@
+class Solution:
+    def containsDuplicate(self, nums: List[int]) -> bool:
+        appeared = defaultdict(int)
+        for n in nums:
+            if appeared[n] > 0:
+                return True
+            appeared[n] += 1
+        
+        return False
+