1.Description
Given an array of size n, find the majority element. The majority element is the element that appears more than ? n/2 ? times.
You may assume that the array is non-empty and the majority element always exist in the array.
Credits:
Special thanks to @ts for adding this problem and creating all test cases.
1）排序后，中间数就是nlogn
2）因为目标数出现的次数>[n/2]，所有我们可以把除了目标数之外的数作为一个整体看待。目标数和其他数比较，次数肯定是多的。
[LeetCode]169. Majority Element
原文：http://www.cnblogs.com/shihuvini/p/7342598.html