The 14th Blue Bridge Cup Simulation Competition University Group B Python
foreword
The 14th Blue Bridge Cup Simulation Competition (Phase 3) Python
first question
The first question is as follows
fill in the blank
Please find the smallest number greater than 2022 that, when converted to hexadecimal, has all the digits (excluding the leading 0) as letters ( A arrive F).
　Please submit the decimal form ...
Posted by rlhms09 on Sun, 12 Mar 2023 21:21:07 +0300
Execute task queue in Qt C++ sub-thread
overview
This situation is often encountered in projects. When some time-consuming operations are to be performed, if they are performed in the main thread, the interface will be blocked and the overall experience will be poor. In this case, usually the The task is thrown to the child thread for execution. Then if there are many tasks that n ...
Posted by e-novative on Sun, 12 Mar 2023 13:58:35 +0300
How does hive view data skew through explain, and what information do you mainly look at?
First of all, what is hive data skew: The so-called data skew means that when running HQL to process large-scale data, the calculation time of a certain task is significantly longer than that of other tasks, so what is the reason for this situation?
The first is that the data division is uneven. When the data is group ed, the key division is ...
Posted by php_dev on Sun, 12 Mar 2023 11:02:17 +0300
Qt project: file copy project
Basic knowledge:
When developing a desktop application, it is assumed that the application needs to process more complex logic in some cases. If there is only one thread to process it, it will cause the window to freeze and cannot handle the relevant operations of the user. In this case, the It is necessary to use multi-threading, one of whi ...
Posted by Calimero on Sat, 11 Mar 2023 23:02:44 +0300
yyds,Elasticsearch Template automatically manages the creation of new indexes
1. What is Elasticsearch Template?
Elasticsearch Template is a feature that applies a predefined template to a new index. At index creation time, it can automatically apply defined templates to new indexes. The Template function can be used to define mappings, settings and aliases of indexes, etc. It is a way to automate the management of ...
Posted by thread_PHP on Sat, 11 Mar 2023 17:02:08 +0300
Front-end performance optimization: compression-webpack-plugin and Nginx configure Gzip
Foreword:There are many front-end performance optimization solutions. This article tries to compress the solution—the front-end package uses the compression-webpack-plugin plug-in to compress static resources, and the server side enables the Gzip attribute in Nginx. In this way, when Nginx accesses a resource, if the resource has a gz fil ...
Posted by lupes on Fri, 10 Mar 2023 05:08:18 +0300
To use DDD well, you must pass Spring Data first
1. Object-oriented design is the core of DDD
DDD focuses on mapping concepts and objects in the business domain to objects, so that the object model can better reflect the real situation of the business, thereby making the design more understandable and maintainable. DDD is a domain-driven design approach aimed at solving business problems ...
Posted by sapoxgn on Thu, 09 Mar 2023 13:37:32 +0300
Enums and Annotations
1. Enumeration
enum definition An enumeration is a collection of constants. It can be considered as a special class that contains only a limited set of specific objects. Two implementations of enumeration (1) Custom enumeration type (2) Use the enum keyword to implement enumeration
3. Custom implementation enumeration (1) There is no need ...
Posted by matt86 on Thu, 09 Mar 2023 10:18:13 +0300
The source code of dating and making friends live APP
1. What is the source code of the live broadcast APP for friends and family? The source code of the live broadcast APP for dating and making friends is a marriage and dating APP that can help single men and women to meet and make friends on the Internet platform. The APP source code is divided into two ends, one end is the user end, and the ot ...
Posted by mihomes on Thu, 09 Mar 2023 03:02:55 +0300
JAVA statement structure
Scanner object
java.until.Scanner is a new feature of Java5, we can see that the user's input is obtained through the Scanner class.
Basic syntax:
Scanner S =new Scanner(System.in);
next():
Be sure to read valid characters before ending the input.For blanks encountered before entering valid characters, the next() method will auto ...
Posted by Quest on Wed, 08 Mar 2023 03:09:00 +0300