leetcode1346

 1 class Solution:
 2     def checkIfExist(self, arr: List[int]) -> bool:
 3         s = set()
 4         n = len(arr)
 5         for i in range(n):
 6             cur = arr[i]
 7             if cur in s:
 8                 return True
 9             if cur % 2 == 1:
10                 s.add(cur * 2)
11             else:
12                 s.add(cur * 2)
13                 s.add(cur // 2)
14         return False
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原文地址：https://www.cnblogs.com/asenyang/p/12286694.html