• [title] sequence counting – Blue Bridge Cup


    Title: sequence counting [problem description]Xiao Ming wants to know the number of positive integer sequences that satisfy the following conditions:1. The first term is n;2. The second term does not exceed n;3. Starting from the third term, the absolute value of the difference between each term and the first two.How many sequences are there for […]

  • Linux shell basic syntax


    Wu Hongdong – recorded on July 3, 2018 – bloghttps://segmentfault.com/u/wu… Linux shell basic syntax script sign #! / bin / Bash is the first line of the shell script, which indicates what interpreter the script uses; #!/bin/bash Echo command is used to output text to the window; echo “hello shell”; #Turn on escape wrap echo […]

  • Java knowledge points


    1. Java common classes java.lang.Object : all classes directly or indirectly inherit from the parent class. Java thinks that all objects have some basic common content, which can be extracted upward continuously, and finally extracted into a top-level class (object). The class defines the functions that all objects havejava.lang.String : in Java, string class is […]

  • Viper read configuration file


    viper Project address: github.com/spf13/viper What is Viper Go development tool is mainly used to deal with various formats of configuration files and simplify the reading of program configuration Viper support: Set default configuration Supports reading JSON toml, yaml HCl and Java property configuration files Monitor the change of configuration file and read the content of […]

  • Exception handling of spool framework


    Using “set” in the spool framework_ error_ Handler and set_ exception_ Handler doesn’t work at all. The reason is that it is hijacked from the bottom by the spool extension. When you need to catch the running errors and exceptions as a whole, you can only try.. catch the function bound to onrequest In addition, […]

  • Django 1.8 official document translation: 9-1-4 format localization


    Format localization overview Django’s formatting system can use the current_ District_Specific formats to display dates, times, and numbers. You can also handle the localization of the input in the form. When it is turned on, two users accessing the same content may see dates, times, and numbers formatted in different ways, depending on the format […]

  • Using fetch API and promise to call restful interface for post


    Basic Concept Promise Overview Promise is a js standard built-in object. Promise is used for asynchronous computations. A Promise represents a value which may be available now, or in the future, or never. A Promise is in one of these states: pending: initial state, not fulfilled or rejected. fulfilled: meaning that the operation completed successfully. […]

  • [tutorial] SQL format() function


      Format() function The format() function is used to format the display of fields. SQL format() syntax SELECT FORMAT(column_name,format) FROM table_name; Parameter description column_ Name is required. The field to format. Format is required. Specify the format. Demo database In this tutorial, we will use the well-known Northwind sample database. Here is the data selected […]

  • Spool v4.5.11 release, bug repair version


    V4.5 as a branch of LTS, this releasev4.5.11Version 4.6.0 combines the bugs fixed in v4.6.0, without adding new features or incompatible changes. Here is the complete update log: enhance Optimize swoole / table (#3959) (@ matyhtf) Enhanced curlopt_ PROXY (swoole/library#87) (@sy-records) repair Fix the problem of not clearing all columns when table is incrementing and […]

  • Docker_07 Dockerfile


    $ docker inspect mysql What is dockerfile DockerfileIt’s calledDockerfileThe file contains some linux commands,DockerBuild the image by reading the command in the file. Dockerfile file content structure DockerfileIt is generally divided into four partsBasic image information, maintainer information, image operation instruction and container start-up execution instruction,#byDockerfileComments in. Run dockerfile docker build -t image_name:tag_name . You […]

  • Golang string formatting


    golang format In go language, fmt.Sprintf (), fmt.Printf (), fmt.Fprintf (), Log.Printf (), log.Panicf () and other functions often use string to format parameters. This article will familiarize you with all parameters. Parameter introduction Verbs Function %v Output according to the original value of the value %+v Expand the structure field name and value based […]