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About using WorkManager Kotlin is the main language introduce WorkManager is a background execution task management, which can continue to execute the created task even after the application exits. You can also add trigger conditions for WorkManager. Of course, there are special cases. When the application is completely killed, the task ...

link 2104. Subarray range and subject Give you an integer array nums. In nums, the range of subarray is the difference between the largest element and the smallest element in the subarray. Returns the sum of all subarray ranges in num. A subarray is a sequence of consecutive non empty elements in an array. Examples Example 1: I ...

Storage structure of sequence table (1) When a high-level programming language such as c language is used to describe the problem of data structure, the method to realize the sequential storage structure is to use array. (2) There are two kinds of arrays: static array and dynamic array. The application and release of static array storage space ...

Prototype inheritance Advantages: the same prototype object Disadvantages: the prototype object cannot be modified, which will affect all instances function Animal(){ this.type = "animal" }; function Cat(name,color){ this.name = name; this.color = color; }; Cat.prototype = new Animal ...

Source code acquisitionBased on the minimum system board of STM32F103RET6, open source link: fallingStar boardWhat is a communication protocol?Communication protocol, also known as communication procedure, refers to an agreement on data transmission control between communication parties. The agreement includes unified provisions on data format, ...

1, Dialog introduction Dialog box is the top-level window for brief interaction with users QDialog is the base class of all dialog windows in QT. QDialog inherits from QWidget. It is a container component and a special QWidget with customized window style. As a special interactive window, QDialog cannot be embedded in other containers as a s ...

  1. Title Given a string containing only the numbers ， 2-9 ， returns all the letter combinations it can represent. The answers can be returned in any order. The mapping of numbers to letters is given as follows (the same as telephone keys). Note that 1 does not correspond to any letter. Source: LeetCode link: https://leetcode-cn.com/pr ...

👏 About the author: Hello, I'm cabbage ~ ~, a sophomore in school, and a new star creator in the Java field.📝 Personal homepage: Cabbage CSDN blog📕 Series column: This article is written in the SpringBoot column: Explanation of SpringBoot knowledge points📧 If there are mistakes in the knowledge points of the article, please correct them! Le ...

Using scapy module to construct icmp packet probe 0x01 module installation Scapy is used here, so you need to install pip install scapy first, and then encounter the following error reports: ValueError: Unknown pypcap network interface '\\Device\\NPF_Loopback' After searching the Internet, npcap needs to be installed to run scapy on wi ...

Postgres Partition Table II 1, Background   in the previous article Postgres partition table I In, we mentioned that there are some differences in the way Postgres creates and uses partition tables after version 10.0. This article will mainly introduce the creation and use of partition tables after Postgres 10.0.    after we cr ...