LeetCode:Majority Element

题目描述：

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.

思路：对数组进行排序，排序过后，数组的主元素必定位于数组中间的位置。

代码:

int my_cmp(int a,int b)
{
    return a > b;
}

int Solution::majorityElement(vector<int> &num)
{
    sort(num.begin(),num.end(),my_cmp);
    return num[num.size()/2];
}