leetcode137

 1 class Solution:
 2     def singleNumber(self, nums: 'List[int]') -> int:
 3         dic = {}
 4         for n in nums:
 5             if n not in dic:
 6                 dic[n] = 1
 7             else:
 8                 dic[n] += 1
 9         for k,v in dic.items():
10             if v == 1:
11                 return k
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原文地址：https://www.cnblogs.com/asenyang/p/12022153.html