From 6a2a68ee173c9de6fdf88624b1204bbb1896e800 Mon Sep 17 00:00:00 2001
From: bumpsoo <bumpsoo063@protonmail.ch>
Date: Sun, 1 Dec 2024 20:40:35 +0900
Subject: [PATCH] https://leetcode.com/problems/check-if-n-and-its-double-exist

---
 easy/check_if_n_and_its_double_exist.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 easy/check_if_n_and_its_double_exist.py

diff --git a/easy/check_if_n_and_its_double_exist.py b/easy/check_if_n_and_its_double_exist.py
new file mode 100644
index 0000000..d2da00d
--- /dev/null
+++ b/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
+