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Logu P4063 [JXOI2017] series (dp)

meaning of the title Title Link Sol It's not hard to think about this problem, but it's very troublesome to write, and then I went to look a...
9:34 2 December 2019

Some problems in Ubuntu 18.04 PostgreSQL 11 apt default installation

First, install the software by default (this article takes PostgreSQL 11.1 as an example, and other versions are similar). sudo apt install postgresql...
9:33 2 December 2019

Java collection series - HashSet

Original article, reprint please mark the source: Java collection series - HashSet I. overview HashSet is a set set set based on Hash implementation....
9:31 2 December 2019

Logue P4424 [HNOI/AHOI2018] treasure hunt game (thinking problem)

meaning of the title Title Link Sol Fairy question Orz Orz zbq searches 70.. Consider the nature of "and" and "or" \(0 \& 0 = ...
9:11 2 December 2019

A quick start to the tutorial 1 of beautiful soup, a python data extraction tool

brief introduction Picture.png Beautiful Soup is a library that can easily grab information from a web page. It is located at the top of an HTML or X...
9:01 2 December 2019

sys and subprocess of python module and writing simple host scanning script

sys and subprocess of python module and writing simple host scanning script 1.sys module sys.exit(n) function: the interpreter exits automatically whe...
8:43 2 December 2019

PostgreSQL remote link server configuration

PostgreSQL server needs to be configured to be remotely linked by users Profile:pg_hba.conf controls access security and manages the access rights of ...
8:08 2 December 2019

Python file operation (basic)

'''File name: small doubleThe contents of the document are as follows: Last night, cicadas couldn't keep singing.It's three o...
7:36 2 December 2019

Toolbar used in android Fragment

Can be used directly in Activity setSupportActionBar(toolbar); You can override the onCreateOptionsMenu and onoptionsiteselected methods; But in Fragm...
7:12 2 December 2019

Data structure Prim algorithm

The idea of Prim algorithm is as follows: Firstly, the points of the graph are divided into two parts: one is the visited u, the other is the UN visi...
7:05 2 December 2019

Python basic (string) day two

1. Single quotation mark and escape Guide 2. Splicing string 3. Format string 4. Common methods #Remove spaces and special symbols #Search and replace...
7:02 2 December 2019

The meaning and implementation of virtual DOM

This article comes from "An essay on the meaning and implementation of virtual DOM" , if you think it's good, welcome to Star Github wa...
6:59 2 December 2019

Theory+Practice: shell case statement for/while/until loop statement, function, array-full dry goods

Preface: Single quotation marks denote pure symbols with double quotation table strings case multi-branch statement Loop statement for loop statement...
6:39 2 December 2019

Shell develops MySQL master-slave monitoring script

Monitor whether the master-slave synchronization of MySQL is abnormal. If not, send SMS or email to the administrator. 1) develop a daemons script to...
5:52 2 December 2019

Gracefully register events in the React component

Preface In the development of React, we often need to register some events on the window, such as pressing Esc to close the pop-up window, pressing up...
5:43 2 December 2019

Summary of Handlebars, a front-end template engine

I. escape of Handlebars template 1. template Escape, output HTML string when {}} is used When {{}}} is used, html is output without escaping (identif...
5:30 2 December 2019

Cross thread access of winform

Problem description In winform development, we can't avoid using multi-threaded or asynchronous methods in data exchange, so we can't avoid ...
5:30 2 December 2019

update and updateByQuery methods for elasticsearch in PHP

When using ES, we often encounter the situation of updating data, Here is a brief introduction: First, the most common and efficient method is to upd...
5:19 2 December 2019

Noseparte says: How is a gateway thread pool created in online games

Correct Posture for Java Thread Pool Definition of ThreadPool thread pool and how to create it? Configure ThreadPoolExecutor Manage Task Queue Blockin...
4:53 2 December 2019

Realization of Js rotary lottery

Samples Address: http://js.zhumimi.cn/zhujiang/index.htm Source code: https://pan.baidu.com/s/15khesfclf1wmoom6pzcja II. Implementation method 1: buil...
4:33 2 December 2019

How to install multiple versions of CUDA

My machine is CUDA16.04, and CUDA10.0 was installed before. For some reasons, now I need to install CUDA9.0. 1. first https://developer.nvidia.com/cud...
4:16 2 December 2019

Solve the disorder of A6 avant media player

My wife's Audi A6 avant, from my itunes, from music library COPY to SD card, inserted into the media player, checked that the songs in each albu...
4:02 2 December 2019

cv2 window resizable and scaleable

import cv2 videoCapture = cv2.VideoCapture('test.mp4') cv2.namedWindow('name', cv2.WINDOW_NORMAL | cv2.WINDOW_KEEPRATIO) while Tr...
3:54 2 December 2019

Spring Boot get configuration file value

In the process of program development, some values that may be modified are often put into the configuration file. How to get the values of the config...
3:41 2 December 2019

mybatis automatically fills in the time field

For the created ﹣ on and updated ﹣ on entities, it is unnecessary for developers to intervene, because it is enough to explain the use scenario, that ...
3:07 2 December 2019

Detailed introduction to Spring

Preface This article is followed by the detailed introduction to spring (1). It is recommended to read the first article before reading this article. ...
2:41 2 December 2019

ES6 Foundation - ES6 class

Author| Jeskson Source|Dada Front End Bistro ES - Class Classes and Object Oriented: Object-oriented, that is, everything is object. Object-oriented ...
2:02 2 December 2019

Brush the front end of the book

1. The following recursive functions are at risk of stack overflow. How to optimize them? function factorial(n){ return n*factorial(n-1) } Answer: fun...
1:55 2 December 2019

Solve Jackson 2 deserialization LocalDateTime error

Today, when integrating redis and spring boot, I encountered an error. Record it. The error is reported as follows: Could not read JSON: Cannot constr...
1:51 2 December 2019

CCF 201412-2 zigzag scanning

Test question No.: 201412-2 Test question Name: zigzag scanning Time limit: 2.0s memory limit: 256.0MB Problem Description: In the image coding algor...
1:47 2 December 2019