importjava.util.Map;importjava.util.HashMap;importjava.util.List;importjava.util.ArrayList;classSolution{publicList<Integer>topKFrequent(int[] nums,intk){// 统计元素的频率Map<Integer, Integer> freqMap =newHashMap<>();for(intnum : nums) { freqMap.put(num, freqMap.getOrDefault(num,0) +1...
class Solution: def topKFrequent(self, nums: List[int], k: int) -> List[int]: # 统计 nums 中每个数字出现的次数, # 时间复杂度为 O(n) ,空间复杂度为 O(n) num_to_cnt = Counter(nums) #将 num_to_cnt 中的数字及其出现次数收集到数组中, # 时间复杂度为 O(n) ,空间复杂度为 O(n)...
【leetcode】347. Top K Frequent Elements 题目地址:https://leetcode.com/problems/top-k-frequent-elements/ 从一个数组中求解出现次数最多的k个元素,本质是top k问题,用堆排序解决。 关于堆排序,其时间复杂度在最好和最坏的场景下都是O(nlogn)。 一开始想定义一个结构体,包含元素和元素个数两个成员,后...
Given a non-empty array of integers, return the k most frequent elements. For example, Given [1,1,1,2,2,3] and k = 2, return [1,2]. Note: You may assume k is always valid, 1 ≤ k ≤ number of unique elements. Your algorithm’s time complexity must be better than O(n log...
Leetcode 347.Top K Frequent Elements Given a non-empty array of integers, return the k most frequent elements. 题目链接:Top K Frequent Elements 一句话理解题意:输出数组中出现次数对多的k个数。 在如果用C语言来写这个题目,思路就是先按数的大小排序,然后再用一个结构体数组保存每个...
https://leetcode.cn/problems/top-k-frequent-elements 给你一个整数数组 nums 和一个整数 k ,请你返回其中出现频率前 k 高的元素。你可以按 任意顺序 返回答案。示例1: 输入: nums = [1,1,1,2,2,3], k = 2输出: [1,2] 示例2: 输入: nums = [1], k = 1输出: [1] 提示: 1 <= nums...
原题链接 :https://leetcode.com/problems/top-k-frequent-elements/ Given a non-empty array of integers, return thekmost frequent elements. 给定一个不为空的数字数组,返回出现频率最高的k个元素。 Example 1: Input: nums = [1,1,1,2,2,3], k = 2 ...
Top K Frequent Elements 前 K 个高频元素 (Java)题目: Given a non-empty array of integers, return the k most frequent elements. Example 1: Input: nums = [1,1,1,2,2,3], k = 2 Output: [1,2] Example 2: Input: nums = [1], k = 1 Output: [1] Note: You may assume k is...
简介:Given a non-empty array of integers, return the k most frequent elements.For example, Given [1,1,1,2,2,3] and k = 2, return [1,2].Note: You may assume k is always valid, 1 ≤ k ≤ num Given a non-empty array of integers, return the k most frequent elements. ...
Top K Frequent Elements Given a non-empty array of integers, return the k most frequent elements. For example, Given [1,1,1,2,2,3] and k = 2, return [1,2]. Note: You may assume k is always valid, 1 ≤ k≤ number of unique elements. Your algorithm's time complexity must be...