It's easy to think that the question is related to Steiner tree.
So let's suppose that f(i,sta)f(i,sta)f(i,sta) denotes the minimum cost when the root is iii and the state of pressure at the key point is sta stastasta.
Then all f(i,sta)f(i,sta)f(i,sta) can be found by using the template of Steiner tree. ...
Added by feign3 on Thu, 18 Jun 2020 09:13:08 +0300
DQL data query language
Equivalence / connection query
Omit connection conditions
Invalid connection condition
All rows in all tables are connec ...
Added by nocniagenti on Thu, 18 Jun 2020 08:26:10 +0300
Introduction to NFS
NFS is network Short for file system, the main function is to let different machines and different operating systems share the specified resource files with each other through the network. It can be simply considered as a ...
Added by rhaggert on Wed, 17 Jun 2020 07:47:11 +0300
Reference video: Start Python data mining in 4 days
1 Numpy advantage
1.1 introduction to numpy
Numpy (Numerical Python) is an open-source Python science computing library, which is used to quickly process arrays of any dimension. (numerical → \ to → numerical)
Numpy supports common arr ...
Added by AnarKy on Tue, 16 Jun 2020 09:31:42 +0300
QuerySet API usage
QuerySet can construct, filter, slice, and approximate results without actually accessing the database. Unless you do something to evaluate the query set, no query activity actually occurs to the database.
(1) Basic properties
The QuerySet is iterative, and its databa ...
Use Redis command action
Working with Java code
The Principle and Feature of HyperLog Implementation
Implement HyperLog using Java
Web site UV refers to the amount of Unique Visitor visited by independent users of a Web site, that ...
Added by BlueSkyIS on Tue, 16 Jun 2020 03:56:18 +0300
About STM32F103C8T6 Project File Self-Credit-Free Download https://download.csdn.net/download/weixin_45488643/12522971 This is just a core project file, just add the following code yourself.
STM32F103C8T6 Pulse Width Modulation
Introduction to PWM
Added by xmarcusx on Mon, 15 Jun 2020 19:30:21 +0300
1, What is a binary sort tree?
The binary sorting tree is either an empty binary tree or a binary tree with the following characteristics:
In a binary sort tree, if its root node has a left subtree, the values of all nodes in the left subtree are smaller than those of the root node;
In a binary sort ...
Added by SeenGee on Mon, 15 Jun 2020 08:52:24 +0300
Recently, Koa has been used frequently for server-side development and has become fascinated with its onion model, which makes it great.And koa is mainly streamlined, there is not a lot of integration, everything needs to be loaded on demand, this is more to my taste.
In contrast to express's middleware, express's middleware uses concatenation, ...
Added by darkke on Sun, 14 Jun 2020 19:21:23 +0300