给定一个String数组,求K个出现最频繁的数. 记录一下查到的资料和思路: 1. 使用heap sorting, 先用hashmap求出单词和词频.需要额外建立一个class Node,把单词和词频都保存进去,对Node中的词频进行堆排序.Time Complexity - O(n * logk) 2. 使用index couting,也是先用hashmap求出单词和词频,再基于单词的词频进行Radix Sorting. 这种方法有很多细节还需要思考.  Time Complexity - O…

Given a target number, a non-negative integer k and an integer array A sorted in ascending order, find the k closest numbers to target in A, sorted in ascending order by the difference between the number and target. Otherwise, sorted in ascending ord…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 自定义排序 日期 题目地址:https://leetcode-cn.com/problems/the-k-strongest-values-in-an-array/ 题目描述 给你一个整数数组 arr 和一个整数 k . 设 m 为数组的中位数,只要满足下述两个前提之一,就可以判定 arr[i] 的值比 arr[j] 的值更强: |arr[i] - m…

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 bet…

""" 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] """ """ 用dict实现的木桶排序 解法一…

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…

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]. 其实最简单的就是想到就是用一个小顶堆实现,如果堆中元素个数小于K,则插入元素,如果大于K,则和堆顶比较,如果大于堆顶,则弹出堆顶,插入新元素. 自己实现红黑树有点难,好在C++ STL容器中,map,set和priority_queue都…

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. public class Solution { //桶排序 public List<In…

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]. 分析: http://blog.csdn.net/itismelzp/article/details/51451374 bucket sort, 出现次数作为被sort的对象. public class Solution { public…

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: 347. Top K Frequent ElementsYou may assume k is always valid, 1 ≤ k ≤ number of unique elements. Your algorithm's…