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(I decided to copy my notes from word first.)Perfect as you work on the back) Tree Array Class 3 Applications TYPE 1  P1908 Reverse Order Pair Binary Index Tree Maintain Number greater than 6 = total - smaller than him   a:19260817   Discrete Sort of original array 01126789   Unique weight removal (algorithm)   Arrange Find Abov ...

Anonymous function Anonymous Function in computer programming refers to a class of functions that need not be defined. identifier (function name) function or subroutine It exists in many programming languages. wikipedia Golang supports anonymous functions, that is, when a function is needed, it is redefined. Anonymous functions have no functio ...

nginx configuration file optimization nginx configuration file optimization 1. nginx configuration file simplification 2. Virtual host alias configuration 3. nginx status information configuration 4.0 nginx error log introduction 5.0 User Access Log 6.0 rewrite rewriting url title: nginx configuration file optimization tags: nginx,ac ...

Business Background In PHP environment, the export function is optimized and transformed, and the single synchronous export data volume is more than 20,000. PHP 5.6 + PHPExcel. This time PHP 7.2 + php-ext-excel-export was replaced by PHP 5.6 + PHPExcel. Official github address https://github.com/viest/php-ext-excel-export Extended installation ...

In this section, we will explore the Atomic types in concurrent packages. AtomicXXX and XXXAdder and XXXAccumulator performance tests Start with a performance test that compares AtomicLong (out of 1.5), LongAdder (out of 1.8), and LongAccumulator (out of 1.8) for simple cumulative performance. The logic of the program is simple, you can see tha ...

  pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.woniu</groupId> <artifactId>bkee ...

I. Preface Linux cluster can be divided into two categories: high availability cluster and load balancing cluster. Only high availability clusters are discussed here, and load balancing is explained in the next blog post. High Availability Cluster (HA) consists of two or more servers, usually two servers, one of which works and the other is r ...

15. Iterators: Tools 1. Iterable objects: Officially, as long as the _iter_ method is an iteratable object list,dict,str,set,tuple -- Iterative objects, flexible to use # Method 1: list.__iter__() dict.__iter__() # Method 2: View source code # Method 3: print(dir(list)) # Officially, as long as the _iter_ method is an iteratable object 2. It ...

Questions: In one-to-many, when we have a user, it has 100 accounts. When inquiring the user, the account information under the user is when to use and when to query again. When querying an account, the user information of the account should be queried again as the account is queried. What is lazy loading Delayed loading Queries are initiated o ...

Today's learning includes packages, logging modules, hashlib modules, openpyxl modules, and concepts of deep and shallow copies. package In learning module, we have known four forms of module, one of which is package. What is a bag? It is a combination of a series of module files, expressed as a folder, which usually has a _int_ py file ins ...