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diff --git a/check_n_double_exist.py b/check_n_double_exist.py
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+# 1346. Check If N and Its Double Exist
+
+"""
+given an array 'arr' of integers, check if there exists two indices 'i' and
+'j' such that 'i != j', '0 <= i, j < arr.length', and 'arr[i] == 2 * arr[j]'
+"""
+
+
+class Solution(object):
+ def checkIfExist(self, arr):
+ """
+ :type arr: List[int]
+ :rtype: bool
+ """
+ seen = set()
+ for i in arr:
+ if 2 * i in seen or i / 2 in seen:
+ return True
+ seen.add(i)
+ return False
+
+
+if __name__ == "__main__":
+ obj = Solution()
+ print(obj.checkIfExist(arr=[10, 2, 5, 3]))
+ print(obj.checkIfExist(arr=[3, 1, 7, 11]))