Majority Element

最新推荐文章于 2022-04-16 14:23:13 发布

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最新推荐文章于 2022-04-16 14:23:13 发布

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分类专栏： Leetcode

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本文介绍了一种算法，用于在给定数组中找到出现次数超过数组长度一半的元素。通过迭代数组并使用计数变量，算法能够高效地识别出这种特定类型的元素。

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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.

if extend the problem to more than⌊ n/k ⌋ times, need a k-1 size array.

class Solution {
public:
    int majorityElement(vector<int> &num)
	{
	    if (num.empty())
	    	return 0;
        int repeat = 1;
        int cur = num[0];
        
        for (int i = 1; i < num.size(); i++)
        {
        	if (cur == num[i])
        		repeat++;
        	else if (--repeat == 0)
        	{
        		cur = num[i];
        		repeat = 1;
        	}
        }
        return cur;
    }
};