Let's say we are given an array: [,,,,,,] We want to get K = 3 smallest items from the array and using Max heap data structure. So this is how to think about it. 1. We take first K items put it into Max Heap: 5 /     \ 4          1 2. Then we move fo…

#include <iostream> #include <time.h> #include <random> using namespace std; //Binary Heap; Max Heap; class BinaryHeap { public: BinaryHeap(); BinaryHeap(int capacity); ~BinaryHeap(); int insert(int value); int getIndex(int value); int r…

Google面试题 股市上一个股票的价格从开市开始是不停的变化的,需要开发一个系统,给定一个股票,它能实时显示从开市到当前时间的这个股票的价格的中位数(中值). SOLUTION 1: 1.维持两个heap,一个是最小堆,一个是最大堆. 2.一直使maxHeap的size大于minHeap. 3. 当两边size相同时,比较新插入的value,如果它大于minHeap的最大值,把它插入到minHeap.并且把minHeap的最小值移动到maxHeap. ...具体看代码 /***********…

The median maintenance problem is a common programming challenge presented in software engineering job interviews. In this lesson we cover an example of how this problem might be presented and what your chain of thought should be to tackle this probl…

(referrence: GeeksforGeeks, Kth Largest Element in Array) This is a common algorithm problem appearing in interviews. There are four basic solutions. Solution 1 -- Sort First A Simple Solution is to sort the given array using a O(n log n) sorting alg…

面试中最常见的问题之一...在N个数中间寻找前K大个元素 最常见的解法就是最大堆 时间复杂度O(N*log(K)) 空间复杂度O(k) 实现了一个最简单的最大堆,每次有元素进来都和堆顶元素比较一下,如果新元素比较大就替换,然后就逐级更新到堆底 namespace Clover.Algoritms.DataStructure { using System; using System.ComponentModel; using System.Linq.Expressions; using Syste…

Source, git Heap is a data structure that can fundamentally change the performance of fairly common algorithms in Computer Science. The heap data structure is called a heap because it satisfies the heap property. The heap property states, that if P i…

简介 heap有查找时间复杂度O(1),查找.插入.删除时间复杂度为O(logN)的特性,STL中heap相关的操作如下: make_heap() push_heap() pop_heap() sort_heap() reverse() 本次着重介绍make_heap() ,根据其创出的堆有大小堆之分. 其函数原型如下: default (1) template <class RandomAccessIterator> void make_heap (RandomAccessIterator…

In computer science, a heap is a specialized tree-based data structure that satisfies the heap property: If A is a parentnode of B then the key of node A is ordered with respect to the key of node B with the same ordering applying across the heap. Ei…

Heap Sort  Build a max heap using exsiting array, which is called Heapify Swap root with the last element, and re-Heapify the root node Heapify Heapify(array, n, i) = 1) compare node[i] with children   2)node[i] is already the largest one, no op.  3)…