Introduction to Python Crawler [10]: Multi-threaded crawling of e-books
Recently, I want to find a few e-books to see, turn around, and then, I found a website called Weekly Reading. The website is very good, simple and refreshing, there are many books, and open all Baidu disks can be downloaded directly, update speed is also OK, so I climbed. This article can be learned, s ...
Posted by Traduim on Mon, 22 Jul 2019 16:23:46 +0200
Three in a row of singles
This is the final chapter, permanent missing.
Main idea of the title:
There are N cards, each card has numbers on both sides, ranging from 1 to 2 N. Find the least number of inversions, so that each card has different numbers on the upward side, and find out the number of solutions to achieve this effect. (multi-test, each card faces upward a ...
Posted by gregolson on Mon, 22 Jul 2019 13:40:50 +0200
Flutter Learning Notes--Component Widget
If you need to reproduce it, please indicate the source: Flutter Learning Notes (9) --Component Widget
In Flutter, all displays are Widgets, Widgets are the basis of everything. We can set data by modifying the data, and then use setState() to notify the framework. The framework will call the State's construction method again to update the use ...
Posted by williamg on Sun, 21 Jul 2019 19:46:01 +0200
[***] When will HZOJ come back to me?
%%% Immortality.
It's a graph theory. I always thought it was a bipartite graph or some data structure.
Directly speaking, the number is regarded as a node and the card is regarded as a side. From the number of the front side of the card to the side of the negative side with the right of 1 and the opposite side with the right of 0, we can fin ...
Posted by BlueGemini on Sun, 21 Jul 2019 15:47:55 +0200
JS code: DOM(document object model)
DOM(document object model):
1. Direct accessible dom element objects:
1.document.documentElement
2.document.head
3.document.title
4.document.body
html, body, title and head Tags
<body>
<h1>linux is very much!</h1>
<h1>js is very much!</h1>
<h1>html5 is very ...
Posted by beckjoh on Sun, 21 Jul 2019 11:08:18 +0200
UVA 10382 Watering Grass Greed+Interval Coverage Problem
n sprinklers are installed in a horizontal strip of grass l meters long and w meters wide. Each sprinkler is installed at the horizontal center line of the strip. For each sprinkler we are given its position as the distance from the left end of the center line and its radius of operation.
What is the minimum number of sprinklers to turn ...
Posted by abhilashdas on Sun, 21 Jul 2019 01:40:30 +0200
Detailed Installation and Configuration of nginx
Detailed Installation and Configuration of nginx
nginx virtual server curl-
Configuration is simple, flexible and portable.
High concurrency (static small file), static tens of thousands of concurrency
Small resource, 2W concurrent, 10 threaded services, memory consumption is only several hundred M
There are many kinds of functions (web,c ...
Posted by love_php on Sat, 20 Jul 2019 17:41:33 +0200
A Preliminary Study of Java Class Set
Class Set
Class Set: The main function is the implementation of Java data structure (java.util)
Class sets are dynamic object arrays (linked lists are also dynamic arrays)
Collection interface*
Collection is the largest single-valued parent interface in the entire class set. That is, only one object can be saved to the collection at a time.
...
Posted by Foregone96 on Sat, 20 Jul 2019 14:52:17 +0200
MacBook Reloads Apache and PHP 7.2
20190718 was supposed to do a php verification code, and it turned out that there were no pictures on my macbook, but it was OK on windows! ___________ Judging that the problem lies in the environment!
macOS Mojave 10.14.5
WEB: Self-contained apache
PHP: Self-contained php 7.1
After a lot of tossing and turning, the final result is: re-insta ...
Posted by twilightnights on Sat, 20 Jul 2019 14:52:29 +0200
Django-ORM table building
Foreplay
ORM (Object Relational Mapping) is a technology to solve the mismatch between object-oriented and relational database.
Advantages of ORM:
The main problem that ORM solves is the mapping of objects and relationships. It usually corresponds one class to one table, each instance of a class corresponds to a record in the table, and each ...
Posted by jagat21 on Sat, 20 Jul 2019 07:40:52 +0200