LeetCode(7): Majority Element

Majority Element: 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.

题意:找出给定数组中的众数,这里的众数指的是出现次数大于n/2的元素,n为数组长度,并且题目假设数组不为空,且存在众数。

思路:本题的解题思路很多,可以直接利用HashMap进行统计,也可以先进行排序,然后遍历一遍记录出现次数最多的那个元素。本次使用排序方法解决问题。

代码:

public int majorityElement(int[] nums) {
        Arrays.sort(nums);   //进行排序
        int majority = nums[0],count= 1;
        for(int i = 1;i<nums.length;i++){
            if(majority==nums[i]){
                count+=1;
                if(count>(nums.length/2))    //判断是否为众数
    {
          return majority;
    }
            }else{
                majority = nums[i];
                count=1;
            }
        }
        return majority;
    }

盗一张图LeetCode的建议解决方案:

时间: 2024-10-12 16:10:15

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