第一题、169. Majority Element-
Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times.Given an array of size
阅读背景：
169. Majority Element--寻找数组中出现次数超过一半的数据，229. Majority Element II--注意最后的检测
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