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Press the / atcoder and rock paper (AtCoder-2141)
Problem Description AtCoDeer the deer and his friend TopCoDeer is playing a game. The game consists of N turns. In each turn, each player plays one o...
Implementation of Swoole Redis connection pool
This article only implements a Redis connection pool, which is too short. By the way, integrate the previous several articles.These points are roughly...
java.io.IOException: unexpected end of stream on Connection exception resolution
<-- HTTP FAILED: java.io.IOException: unexpected end of stream on Connection 05-23 10:16:51.955 W/System.err( 992): java.io.IUTF-8...
The sixth Blue Bridge Cup group a C / C + + national competition in 2015
Title: magic square of fourth order Fill the numbers from 1 to 16 into the 4x4 square, so that the sum of rows, columns and two diagonals are equal, ...
The design of Java immutable class
1.1 immutable class Immutable class refers to a class whose state cannot be modified after an instance is created. Their instance information is prov...
Study and organize the Boston house price prediction model GridSearchCV
coding: utf-8 import numpy as np import pandas as pd #Read data, preprocessing data = pd.read_csv('housing.csv') prices = data['MEDV&#...
Python basic object-oriented features
Article directory 1. Do not use inheritance to develop animals and dogs 2. Use inheritance to develop animals and dogs 3. Transitivity of inheritance...
Java annotates the specified string of Word
This article describes how to annotate a specified string in a Word document in a Java program. Preceding text In, it mainly introduces the methods of...
Spring series six: the use of spring JDBC template in Dao
concept The main function of JDBC template in Spring is to realize data interaction. Next, we will use JDBC template to write test cases in dao layer ...
spring cloud microservice architecture b2b2c e-commerce - common service project construction process
We will analyze the whole project of common service, record the whole construction process, and let more people to learn. First, before building the c...
Flink getting started state update
There is such a need to count the number of times a line is clicked every hour, It needs to write statistics to redis every 30 seconds, and use the S...
A detailed explanation of how the generated token of jwt authentication is passed back to the backend and parsed
token backend parsing after jwt authentication generation First, the front end sends the token The location of token headers {'authorization'...
The most complete pip use guide, 50% you may not have used it
All Python developers know that Python is so popular, which can stand out among many high-level languages. In addition to its simple syntax and easy t...
podman pilot test - comparison with docker
1. What is docker? Docker is an open source application container engine, which belongs to the encapsulation of Linux containers. Docker provides a s...
Common skills of unit test (PHPUnit + Laravel)
1. Data provider To provide parameters and results, use the @ dataProvider annotation to specify which data provider method to use. For example, to ch...
Redis -- delay queue
Redis's list data structure is often used as an asynchronous message queue. rpush/lpush is used to enter the queue and lpop/rpop is used to exit...
Regular expression and document editor sed of Linux O & M Yunsheng notes
Overview of regular expressions It uses a single character to describe and match a series of strings that conform to the rules of a statement. It is ...
Mybatis source code mybatis excel framework
As we introduced in the previous chapter, Mybatis will convert all database operations into iBatis programming model, and operate the database through...
[springboot development monomer web shop] 2. Mybatis Generator generates common mapper
Mybatis Generator tool After we start a new project, we usually have to write a lot of entity/pojo/dto/mapper/dao... Most of the R & D brothers wi...
Scrapy redis distributed crawler crawling Douban movie details page
Usually, crawlers use the Scrapy framework, usually running on a machine, and the crawling speed can't achieve the expected effect. The amount of...
Convert nested JSON data to TABLE
Prepare some data first: Create a temporary table to store: DECLARE @json_table AS TABLE ( [type] NVARCHAR(MAX), [desc] NVARCHAR(MAX) ) Source Code Ge...
Samba server configuration under Centos7 (actual combat!)
Samba overview Samba is a free software to implement the SMB protocol on Linux and UNIX systems, which consists of server and client programs. SMB (S...
[CH4201] Loulan Totem
I use tree array to solve this problem After we read in the data, we analyze the problem and solve two problems: the number of '^' and the n...
Single arm Routing - logical interface (detailed transmission process!)
Single arm routing Single arm routing (router-on-a-stick) refers to the interconnection and interworking between different VLAN s (virtual LANs) isol...
java design pattern ~ responsibility chain pattern
Responsibility chain, I feel that there are five steps for organizing work flow dynamically according to requirements, for example, to complete a thin...
Codeforces 444C DZY Loves Colors
<Title Link> Main idea: Given an interval of $[1,n] $($1\leq10^5 $), the color of each position in the interval is its interval subscript. Now t...
[school training 2019-05-22] prediction
[main ideas] First of all, use the hall hall theorem + + + line tree to judge whether there is a solution. If there is a solution, consider construct...
[NOI2006] network charge
An interesting question for thieves. Think about converting the cost into something. Watch If we define the state of leaf node ,}, the state of non le...
Travel by one (Dijkstra)
Problem Description Although Caoer is a road crazy (i.e. he has been in Hangzhou Electric Power for more than a year, and even lost his way in the ca...
Spring Boot cache technology (ehcache, SpringData Redis)
Spring boot integrates Ehcache Spring boot integrates spring dataredis I. spring boot integrates Ehcache 1. Import related maven dependencies <pro...