https://leetcode.com/problems/check-if-n-and-its-double-exist

easy/check_if_n_and_its_double_exist.py

@@ -0,0 +1,16 @@
+# https://leetcode.com/problems/check-if-n-and-its-double-exist
+
+from typing import List
+
+class Solution:
+    def checkIfExist(self, arr: List[int]) -> bool:
+        m = {key: True for key in arr}
+        i_count = 0
+        for i in arr:
+            if i == 0:
+                i_count += 1
+                continue
+            if i * 2 in m:
+                return True
+        return True if i_count > 1  else False
+