Shanghai Computer Society November Competition

Shanghai Computer Society November Competition Judgment of odd and even numbers topic description Given an integer n, if n is an even number, output even, if n is an odd number, output odd. input format A single integer: represents n. output format A single string: representing the parity of n data range \(-1,000,000\leq n\leq 1,000,000\) sampl ...

Posted by skyagh on Thu, 24 Nov 2022 07:11:52 +0300

python data type conversion and operators

This section needs to know Reserved Words and IdentifiersUnderstanding Data Types in Pythonbasic data typeConversion between data typeseval() functiondifferent base numbersoperatoroperator precedencesmall classroom tasks 1. Reserved words true='real' True='real' File "<ipython-input-2-0244e2f5e602>", line 2 True='real' ^ ...

Posted by wardo on Wed, 23 Nov 2022 03:48:14 +0300

Chapter 2-4-2 Introductory case of rule engine Drools - business rule management system - componentization - middle platform

3. Drools entry case A full set of codes and materials are provided in full, click here to download This section uses an introductory case of Drools to let everyone have a preliminary understanding of how to use Drools and have an overall concept of Drools. 3.1 Description of business scenarios Business scenario: Consumers purchase books in th ...

Posted by lmninfo on Wed, 23 Nov 2022 01:22:10 +0300

Implementation of paging in JavaWeb - based on Mysql (general)

I believe you can also see the paging effect on the website! So now let's take a look at his ideas, codes and renderings.General pagination based on MySql database The core idea of ​​general paging: send the last query request again, but the page number has changed Implementation steps: 1) Query all data first Junit test     baseDao&l ...

Posted by apoc- on Tue, 22 Nov 2022 20:07:21 +0300

Nginx gray release ---- [cookie], [IP]

Grayscale publishing refers to a publishing method that can smoothly transition between black and white. AB test is a grayscale release method, allowing some users to continue to use A and some users to start using B. If users have no objection to B, then gradually expand the scope and migrate all users to B.Grayscale publishing can ensure the ...

Posted by codeDV on Mon, 21 Nov 2022 16:17:25 +0300

Go Error Handling Best Practices

The most obvious difference between Go's error and Java's Exception is:Native libraries do not carry stacktraceNative library does not support WrapThis brings some troubles to program debug ging, so we will use github.com/pkg/errors to replace the native errors package to handle Error s.However, due to the high probability of not usin ...

Posted by ediehl on Mon, 21 Nov 2022 06:02:43 +0300

Postorder + inorder sequence to construct binary tree

Postorder + inorder sequence to construct binary tree Input sample: The length of the input sequence in the first line is n, the input of n characters in the second line indicates the sequence of binary tree post-order traversal, and the input of n characters in the third line indicates the sequence of binary tree in-order traversal 9 GHDBEI ...

Posted by Topsy Turvey on Sun, 20 Nov 2022 02:17:57 +0300

Pitfalls encountered in Mysql

Pitfalls encountered in Mysql 1. Erdog, when you create a table, do you always set Null as the default value? Damn, how do you know, how simple Null is, how convenient it is to set Null without passing a value, and it doesn’t take up much space, and you don’t need to fill in the code, and you don’t need to judge. Ergou, ...

Posted by onion2k on Sun, 20 Nov 2022 01:41:10 +0300

Spring AOP (aspect-oriented programming) and AspectJ framework to achieve AOP (annotation)

What is AOP (1) Aspect-oriented programming (aspect), the use of AOP can isolate each part of the business logic, so that the coupling degree between the parts of the business logic is reduced, the reusability of the program is improved, and the efficiency of development is improved. (2) Popular description: Add new functions to the main funct ...

Posted by koen on Sun, 20 Nov 2022 00:31:39 +0300

(STM32) RT-Thread journey from scratch--SPI driver ST7735

Previous: (STM32) RT-Thread journey from scratch--PWM drives ST7735 dimming The driver used in this article is provided by ST official: https://github.com/STMicroelectronics/stm32-st7735.git If you need it, you can directly git clone it for transplantation. The core code has nothing to do with the chip model, and the portability is very goo ...

Posted by pietbez on Sat, 19 Nov 2022 02:51:56 +0300