问题描述：

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.

基本思路：

投票策略。接设每个数字都投自己一票，结果一定是大多数的数字胜出。不同数字的得票可以相互抵消。

代码：

int majorityElement(vector<int> &num) {
        int voter = num[0];
        int count = 1;
        
        int size = num.size();
        for(int i = 1; i< size; i++){
            if(count == 0){
                count++;
                voter = num[i];
            }
            else if(voter == num[i])
                count++;
            else 
                count--;
        }
        return voter;
    }

[leetcode]Majority Element