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2021-09-20 swipe questions and punch in every day
OJ
p2018 cow story Problem description There is a cow. I...
Decorator mode of design mode
Starbucks Coffee order item The types of single coffee are Espresson, ShortBlack, LongBlack and Decaf.Seasoning: Milk, S...
3, Install Clickhouse (stand-alone & cluster) in docker
1, Install docker https://blog.csdn.net/weixin_39912640/article/details/120391027 2, Install zookeeper cluster
...
Grouping function of oracle
What is a grouping function The grouping function acts on a group of data and returns a value to a group of data. Group...
Binary tree (sequential storage binary tree, threaded binary tree, Huffman tree, binary sort tree, balanced binary tree)
Here I will not explain some basic terms of the tree. Partners in need can go to Baidu to understand the terms of the tr...
MyBatis -- foreach of dynamic sql
preface The foreach tag of mybatis is often used to traverse collections and build in conditional statements or batch op...
Summary of problems in learning pytorch framework
pytorch framework learning 1: Linear region, Logistic Regression, Softmax Classifier
...
OpenStack wallaby installation - Basic Service grace installation
precondition Before installing and configuring the image service, you must create a database, service credentials, and A...
Linux Enterprise Operations and Maintenance - Redis installation and deployment, master-slave replication, master auto-switching
1. What is Redis Redis is one of the most popular NoSQL databases today. Redis is an open source, multi-data structure, ...
Null pointer problem due to instruction rearrangement of instantiated objects in multithreaded case
The question comes from: Why can't there be less volatile keywords in the double check singleton mode? public class Sing...
P1540 [NOIP2010 improvement group] machine translation & & P1160 queue arrangement
Topic background
Xiao Chen has installed a ma...
Bootstrap select drop-down multiple selection box + selected item add radio button group
1, Problem description For the requirements encountered in the work, the drop-down radio box needs to be changed into a ...
Detailed explanation of Set object and Map object in front-end JS (probability, creation, use method, etc.)
Map and Set Map and Set are two new data types in ES6Are built-in constructorsInstantiate using new
...
MySQL Timed Backup Database
In the process of data operation, data errors may occur, even the database may run into disruption. Effective timed back...
python -- datetime library usage
The datetime module is a collection of date and time modules. Datetime has two constants, maxear and MINYEAR, which are ...
Java multithreading operation
Four ways to create threads Inherited from Thread class Create a subclass that inherits from the Thread classOverride ru...
CMakeLists.txt syntax introduction
1, Common commands 1. Specify the minimum version //Set the minimum version number required by cmake cmake_minimum_requi...
About the two kinds of ROS Time that will appear in ROS
During the experiment, it is found that ROS actually counts two ROS times
...
Chapter three, dictionaries and collections
Dict type is not only widely used in various programs, but also the cornerstone of Python language. The dictionary can b...
cron expression explanation
(cron = "* * * * * *") cron expression format For example, "0 0 12? * wed" is executed at 12:00 p.m. every ...
Developing Chrome plug-ins using Vue
Original link: Using Vue to develop Chrome plug-in - ashamed Xiaozhan (kuizuo.cn) preface When I was learning to ...
Map using DEM and vector data
To generate a picture map, you can use ArcGIS, QGIS and other tools, or code. What I introduce here is, of course, imple...
File Bulk Download
background With the development of digital media, more and more media files are produced every day. Scenes involving fil...
Web Page Development Foundation: Servlet Technology
asdsServlet is an extension branch written in Java language that is applied to the Web server side. It precedes JSP and ...