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Nine palace pattern of lottery component
Written in front I changed my career in the middle and bumped into the front end by mistake. It may be due to my 'laziness'. I have never pu...
Java's new project learning online notes - day3(3)
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PHP+Redis can delay tasks and automatically cancel and complete orders
Simple timing task solution: use redis's keyspace notifications (notify events after key failure); (A) business scenario: 1. When a business is t...
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[tutorial] Java MySQL connection
Reprinted from http://www.runoob.com/java/java-mysql-connect.html In this chapter, we will show you how to use JDBC to connect to MySQL database. A d...
Application instance of rewrite Module of Nginx service (actual combat! Can do with it!)
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Data structure quick sort
Fast sorting is the upgrade of bubble sorting, which belongs to exchange sorting. The basic idea of fast sorting is: the records to be sorted are div...
R script reading summary Excel table data
It mainly uses xlsx and rJava package, opens Excel file, reads data of each table, and writes it to summary table. The following figure shows the ori...
Binary tree traversal algorithm
Preorder traversal Idea: first root node - > left subtree - > right subtree;The binary tree is as follows: /** * TreeSearch Brief description *...
Things about Android layoutparams
Original text: http://tryenough.com/android-... What is LayoutParams? LayoutParams is used by View to tell its parent control how to place itself. Lay...
The stored procedure for generating time dimension in mysql (stored procedure example)
This paper mainly records the problem of generating time dimension in the process of BI and data analysis. It is also a basic example of mysql stored ...
Optimization of construction speed of vue-cli2
For the front-end projects created by using Vue cli scaffolding, compiling and publishing are almost necessary operations, some of which only need sec...
Get the weight or feature of a layer in the middle of Python
Get the weight or feature of a layer in the middle of Python Question: how to deal with a trained network model that wants to know the weight of a ce...
[FJOI2015] division of line tree of Mars store problem
Each inquiry of this question has two intervals, one is time interval and the other is store number interval. Each purchase is also related to the ti...
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Handwritten code of front-end written test
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django development - building distributed (multi node) task queue with cellery
Today, I'll show you how to use cellery to build a task queue with two nodes in django project (one master node and one child node; the master no...
Python automatic operation and maintenance development: basic Mysql Database Paging and paging in Python code
Back end database paging is implemented according to limit The first writing method: limit the number of pages offset start position select id,name,s...
Use form create to dynamically generate vue components, supporting json format
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Luogu P3346 [ZJOI2015] fantasy land favored by gods (generalized suffix automata)
meaning of the title Title Link Sol Board questions of generalized SAM. First, if the leaf node is no more than 20, then the subtree whose root is eac...
Atcoder starter contest 115-d problem solving Report
subject https://atcoder.jp/contests/abc115/tasks/abc115_d thinking This problem is a delicate recursive one. Hamburgers of Level-0, level-1 and level...
Reconstruction of P4198 building in Luogu (line section tree)
meaning of the title Title Link Sol Don't ask me why I sent it twice just to cheat traffic The line tree method of this question is very wonderfu...
Differences between CountDownLatch and join
When the ants were asked this question, they really couldn't imagine the difference when they realized the same function. When they came back to...
Troubleshooting of Oracle with high resource consumption but execution = 0
During the daily inspection of a customer's production environment database, it was found that the AWR report had a high resource consumption but...