# 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