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Regular expression

Regular expressions are usually used to retrieve and replace text that meets a certain pattern (rule). Assertions Definition: Indicates that a match occurs under certain conditions. Assertions include pre-assertion, post-action and conditional expressions. One of the components of the assertion is the boundary. For text, words or patterns, boundaries can be used to indicate their beginning or ending part Boundary class assertion charactermeaning^Match the beginning of the input . If the multi-li

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In-depth understanding of send and recv in TCP network programming again

Article source: click to open the link blog.csdn.net/yusiguyuan/... blog.csdn.net/yusiguyuan/...   First clarify a concept: each TCP socket has a sending buffer and a receiving buffer in the kernel. The full-duplex working mode of TCP and the sliding window of TCP are dependent on these two independent buffers and this buffer. The filling state. The receive buffer caches the data into the kernel. If the application process has not called read for reading, the data will always be cached in t

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Traversal of binary tree

Overview of Binary Tree Traversal Traversal is a common operation in data structures. The traversal of the binary tree is to visit all the elements once. According to the different order of node access, there are 4 common ways to traverse a binary tree: Preorder Traversal Inorder Traversal Postorder Traversal Level Order Traversal Preorder traversal The idea of pre-order traversal: 1. Visit the root node; 2. Visit the left subtree of the current node ; 3. If the current node has no left subtree,

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Industrial steam forecast

Preface Thermal power generation uses the steam generated by heating water when fuel is burned to drive the steam turbine to rotate, and then the steam turbine drives the generator to rotate to generate electricity. In this process, the combustion efficiency of the boiler is the core that affects the efficiency of power generation. There are many factors that affect the combustion efficiency of the boiler, including the conditions of the boiler itself, such as the amount of combustion, primary a

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Let's talk about the future of C++11 new features and the open source project ananas (folly, std c++11 and the future of ananas are the differences?)

I. Introduction 1. I first saw this article from the WeChat public account and learned that the open source project ananas (A C++11/golang protobuf RPC framework) implements Linux high-performance network libraries and rpc functions, the core of which is rewriting The usage of C++11 future. The link to the WeChat article is: mp.weixin.qq.com/s/hurLTscQv... The author of ananas is Bert Young, and his github address is github.com/loveyacper ananas-rpc and promise/future technology, QQ exchange gro

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The beauty of Go language concurrency

Article source: www.cnblogs.com/yuxingfirst... Introduction           Multi-core processors are becoming more and more popular. Is there a simple way to let the software we write unleash the power of multi-core? The answer is: Yes. With the rise of programming languages designed for concurrency, such as Golang, Erlang, Scale, etc., new concurrency patterns have gradually become clear. Just like procedural programming and object-oriented programming, a good programming mo

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Leetcode1 Interesting Numbers (Basics-Part 1)

1. Armstrong number 1.armStrong.py: #!/usr/bin/python # Env: python3 # Rewrite by afei_0and1 ''' 1. Suppose there is a k-digit number N, and the sum of the k powers of the numbers on each digit is also N, then this number is the Armstrong number. Now give you a positive integer N, let you determine whether this number is an Armstrong number, if it is, return True, if not, return False. EG: 153 is a 3-digit number, and: 153=1^3+5^3+3^3 Armstrong number is actually a self-power number, and the thr

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Functional verification of docker-based distributed performance testing framework (1)

This article is the practice of the distributed performance test function expansion of the FunTester test framework, which is a relatively rough technical verification practice. The technical solution adopts the scenario envisaged in the distributed performance test framework use case scenario (1) . The rough implementation scheme is divided into three parts: master scheduling machine , slave test machine and server tested service . master scheduling machine: handle use cases and assign tasks Sl

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Basics: Take you to open the door of Vue (middle)

Part VI: Vue component basics Components are reusable Vue instances. Component-based development refers to the extraction of a complete page into individual components, and finally, the functions of the entire page (project) are completed through these individual components. Advantages of component-based development /Function: Reuse 1. The basic use of components (register first, then use) 1.1 Global component registration and use Register global components Vue.component( 'child' , { template: `

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How to play Hongmeng Softbus's cross-device access-small summary

table of Contents: 1. Start FA across devices, migrate across devices, and migrate back 2. Connect Service across devices 3. More articles Key code: 1. Start FA across devices, migrate across devices, and migrate back (1) Permission ohos.permission.DISTRIBUTED_DEVICE_STATE_CHANGE: Used to allow monitoring of device status changes in the distributed networking. ohos.permission.GET_DISTRIBUTED_DEVICE_INFO: used to allow access to the device list and device information in the distributed networking

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"Dp card replenishment-the issue of buying and selling stocks"

table of Contents 121. The best time to buy and sell stocks greedy dp ideas Scrolling array optimization 122. The Best Time to Buy and Sell Stocks II 123. The best time to buy and sell stocks III 188. The Best Time to Buy and Sell Stock IV 309. The best time to buy and sell stocks includes a freezing period 714. The best time to buy and sell stocks includes handling fees 121. The best time to buy and sell stocks greedy Take the leftmost minimum value, take the rightmost maximum value, and the di

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What is the HTTP protocol? What are the commonly used status codes?

1. Introduction to HTTP The HTTP protocol is the abbreviation of Hyper Text Transfer Protocol (Hyper Text Transfer Protocol), which is a transfer protocol used to transfer hypertext from a World Wide Web (WWW: World Wide Web) server to a local browser. HTTP is a communication protocol based on TCP/IP to transfer data (HTML files, picture files, query results, etc.). HTTP is an object-oriented protocol belonging to the application layer. Due to its simple and fast method, it is suitable for distr

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China Domestic-A Collection of Available APIs

China Domestic-A Collection of Available APIs Include a collection of APIs available in China and share it with you table of Contents notes Travel dictionary E-commerce map the film Instant messaging Developer website Express inquiry tourism Social video the weather team cooperation Picture and image processing Takeaway News push music cloud Speech Recognition Comprehensive notes OneNote  -OneNote supports getting, copying, creating, updating, importing and exporting notes, supports adding

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Piziheng Embedded: NXP i.MX RT1xxx series MCU startup those things (6)-Bootable image format and loading (elftosb/.bd)

Hello, everyone, I am the ruffian, a serious ruffian who engages in technology. Today Pi Ziheng will introduce to you the Bootable image format and loading process of NXP i.MX RT1xxx series MCU . Start the third article Serial Downloader mode (sdphost, mfgtool) in the i.MXRT1xxx series of the Ziheng used an image file named ivt_flashloader.bin when introducing the use of sdphost to boot Flashloader. In fact, this image file is a part of Bootable image. Kind of, although Pi Ziheng briefly analyz

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Elasticsearch: Introduction to pipeline aggregation

First, let's imagine a table like this: The above table shows the number of users per month, but how can we get the following information: Which month has the largest number of users? What is the total number of users from April to January? What is their average number of users? What is the value that changes every month? All of these problems can be calculated using Pipeline aggregation, because the statistics of these data need to use its parent or sibling-level aggregation output. Pipeline ag

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[C++ Advanced] Use overloaded binary operators to improve the plane vector class Vec2D

Previous review In [C++ Advanced] Following the TDD principle and implementing the plane vector class (Vec2D) , we have initially implemented the Vec2D content, and now we have made certain improvements: Realize half of Vec2D binary arithmetic operator overload 1, +-(two Vec2D object operations and one Vec2D object and a double number operation) 2, * (dot multiplication and number multiplication) At the same time, use the function that involves copying the object to pass The way of reference is

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2020 Blue Bridge Cup National Championship Java University Group B Problem Solving Report

Question A: Beautiful 2 Problem Description Xiaolan likes 2 very much. This year is 2020 AD. He is very happy. He is very curious. From 1 to 2020 (inclusive), how many years contain the number 2 in the digits? Answer submission This is a fill-in-the-blank question, you only need to calculate the result and submit it. The result of this question is an integer. Only fill in this integer when submitting the answer. If you fill in the extra content, you will not be able to score. import java.io.*; i

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Git study notes

Git study notes Learning path oschina.gitee.io/learn-git-b... 1. Git commonly used commands $ git clone /path/to/repository # Execute the following command to create a clone of the local repository $ git clone username@host:/path/to/repository # Repository on the remote server $ git pull # Update your local repository To the latest changes $ git branch -vv # View the remote branch corresponding to the local branch $ git remote -v # View the remote URL corresponding to the local copy code 2. Add

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[Workshop scheduling] Based on genetic algorithm to solve the workshop scheduling model with GUI

Job shop scheduling problem description Job Shop Scheduling (JSP) is one of the most classic NP-hard problems. Its application fields are extremely wide, involving aircraft carrier dispatching, airport aircraft dispatching, port terminal cargo dispatching, automobile processing assembly lines, etc. JSP problem description: A processing system has M machines and requires N jobs to be processed . Among them, job i contains the number of processes Li . Let, then L is the total number of processes i

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10 best Java frameworks to use in 2021

Java is a powerful language. When combined with a framework, Java can provide you with the best solutions for any domain of e-commerce, banking, cloud computing, finance, big data, stock market, and more. If you are just starting with Java, please refer to Java Live Active using this blog to start using the framework with all the important concepts you need to know. What is a Java framework? The body of pre-written code as a template or skeleton, where a developer can fill in its code as needed

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