Programmer Group

2021-10-20: I opened a new pit yesterday. I felt OK after watching the previous episodes. I regretted why I didn't follow it earlier. I felt that my knowledge system was too scattered before. It seemed that the class ended in November or December. She said that she could reach the level of icpc bronze medal. I believe it for the time being. I h ...

About containers (Collection) 1. What is a container       Container is used to hold and manage objects. In life, we will use all kinds of containers. Such as pots and pans, boxes and bags. The "container" in the program also has similar functions to hold and manage data. 2. Structure of container A single instan ...

1, Serial port transmission file 1. Serial port connection Cross connect the RXD and TXD pins of the two USB TO TTL serial ports, and connect the two USB interfaces to a laptop respectively to realize the serial port transmission between the two computers. Serial Interface is referred to as serial port for short. Serial Interface refers t ...

Introduction and use of Gin framework Gin is a web framework written in Go language. It is an API framework similar to martini but with better performance. Due to the use of httprouter, the speed is increased by nearly 40 times. If you are a performance and efficiency seeker, you will fall in love with Gin. Go is the most popular web framew ...

requirement analysis (1) Using mysql to store student and administrator information (2) The graphical interface is created through tkinter module to realize the login of the administrator, the addition, deletion, modification and query of student information, and the modification of the administrator's own password. Whole engineering class an ...

Thread safety and lock use When we use multiple threads to access the same resource (which can be the same variable, the same file, the same record, etc.), if multiple threads only have read operations, thread safety problems will not occur, but if multiple threads have read and write operations on resources, thread safety problems are easy to ...

For decimal system, for example, 1234.5 = 1 * 10 ^ 3 + 2 * 10 ^ 2 + 3 * 10 ^ 1 + 4 * 10 ^ 0 + 5 * 10 ^ - 1 (sum by weight expansion). ○ 1 other hexadecimal to decimal systems are summed according to weight expansion, such as hexadecimal 0x123=1*16^2 + 2*16^1 + 3*16^0 ○ 2 decimal to other base systems: integer part: Radix division and remainde ...

Stored program Sometimes, in order to complete a common function, many statements need to be executed. It is very annoying to enter so many statements one by one in the client each time. The uncle who designed MySQL kindly provided us with something called a stored program. This so-called stored program can encapsulate some statements, and the ...

Docker 1, Overview The deployment environment (Redis, ES, Hadoop...) is required to publish a project. It is very troublesome to redeploy the environment on the server and cannot cross platform. Therefore, it is processed by Docker with Windows, and finally released to Linux. Traditional: development jar, operation and maintenance deplo ...

Author: a handsome young man  source: http://clsn.io  Chapter 1 zabbix monitoring 1.1 why monitor    When necessary, remind us in advance that there is a problem with the server    When something goes wrong, you can find the root of the problem   　　   Website / server availability 1.1.1 website availabili ...