[leetcode 169. Majority Element]easy |week4

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.

一·题目分析

题目的目的就是找数组中出现次数超过[n/2]的数，也假设了数组一定存在这样的数。想要找到这样的数，只需要遍历一次就可以了，每找出两个不同的element，就成对删除即count–，最终剩下的一定就是所求的。

二、代码

class Solution {
public:
int majorityElement(vector<int> &num) {

int element = 0;
int count = 0;

for(int i = 0; i < num.size(); i++)  {

if(count == 0)  {
element = num[i];
count = 1;
}
else    {
if(element == num[i])
count++;
else
count--;
}

}
return element;
}
};

三、总结

这是一道比较简单的题目，思路也很清晰，一看就能知道该如何去找