TreeMap: JAVA set 2

Hello everyone, today we are going to learn about another member of the Map family: TreeMap. 1, Basic concepts Before introducing TreeMap, let's understand a data structure: binary tree. I believe that the students who have studied data structure know that the data storage form of this structure is ...

Posted on Wed, 19 Feb 2020 02:16:09 -0500 by pradeepmamgain

Java thread pool understanding summary

Basic principle of thread pool ThreadPoolExecutor Executors is the factory class of java thread pool. It can quickly initialize a thread pool that meets the business requirements. Its essence is to initialize a ThreadPoolExecutor object with different parameters. The specific parameters are described as follows: public ThreadPoolExecutor(int co ...

Posted on Tue, 18 Feb 2020 23:44:45 -0500 by jjk-duffy

Java Contains and Remove methods to serialize 85-sets

1. Containment and Deletion 1.boolean contains(Object o); determines if an element is included in a collection.   package com.bjpowernode.java_learning; import java.util.*; ​ public class D85_1_ContainsMethod { public static void main(String[] args) { //Create a collection Collection c = new ArrayList(); //Create two Integ ...

Posted on Tue, 18 Feb 2020 12:16:18 -0500 by woocha

BZOJ3295: [Cqoi2011] Dynamic reverse order pair (cdq division)

Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 6912  Solved: 2438[Submit][Status][Discuss] Description For sequence A, its inverse logarithm is defined as the number of pairs (i,j) satisfying i<j and A i>A J.Give an order from 1 to n, delete in some order In addition to m elements, your task is to count the inverse logarithm of the ...

Posted on Tue, 18 Feb 2020 11:15:06 -0500 by muralimohan001

Section two

The main content of this paper is the application of linear regression - kaggle house price prediction, convolution neural network 1, Linear regression practice The website address of the competition is https://www.kaggle.com/c/house-prices-advanced-expression-technologies The project steps are as fol ...

Posted on Tue, 18 Feb 2020 06:25:57 -0500 by Undrium

Fast lean PDF reader for iPhone / iPad / iOs - tips and hints?

Recently, there are many problems about PDF drawing. Yes, you can easily render PDF using UIWebView, but this does not provide the performance and functionality you expect from a good PDF viewer. You can draw PDF pages To CALayer or UIImage . Apple even has sample code to show how to In Zoomable UIScrollview Draw large PDF But the s ...

Posted on Tue, 18 Feb 2020 05:11:59 -0500 by windyweather

java -- string class

java -- string class string is a reference type, which is actually a predefined class in the java library The string type object is immutable. When modifying the string value, only one new string object can be created String newstring=new String("abc"); / / create a string named newstring an ...

Posted on Tue, 18 Feb 2020 00:21:52 -0500 by exponder

Design patterns in JavaScript (summary)

Please leave a note before reprinting this original article concept Design pattern is a set of re used, most people know, classified, code design experience summary. There are routines in everything. Design patterns are common routines in code writing. Some of them are used in our daily life. Let' ...

Posted on Mon, 17 Feb 2020 23:31:24 -0500 by vadercole

HashMap(JDK1.8) source code analysis

Article directory brief introduction Characteristic data structure Before JDK1.8 After JDK1.8 JDK1.7 VS JDK1.8 comparison Inheritance diagram Member variables Construction method Static inner class Node TreeNode Core method hash() algorithm put() method resize() method treeifyBin() method get() metho ...

Posted on Mon, 17 Feb 2020 22:15:52 -0500 by the-Jerry

Revise day 1 C circle

Today, a big guy told me that I don't have a solid foundation of algorithmic knowledge, even c language can't even know a little bit. I can't learn fast and forget faster, and I can't just learn for competition. So I decided to review the basic knowledge of c language and algorithm and data structure, n ...

Posted on Mon, 17 Feb 2020 05:34:29 -0500 by Xo_