[LOJ3074] "2019 team mutual test Day 3" operation sequence count

[title link] Click to open the link [main ideas] Consider to calculate the number of schemes with no more than three times of operation 222. It should be equal to the multiple of 222 k0k^0k0, 111 k1k^1k1, 111 k2k^2k2 The multiple sum of 111 K I K ^ I K I is NNN. From high to low dpdpdp dp, the number of positions that can ...

Posted on Mon, 18 Nov 2019 13:16:43 -0500 by Love_Daddy

c increase 5-linked list

Article directory Linked list classification Programming elements linux kernel list General linked list Linked list Keywords: discontinuous storage, dynamic generation, pointer connection, data and and pointer fields. classification By head node: Lead linked list (no data field in the head node) Untitled list By no ...

Posted on Mon, 18 Nov 2019 11:47:31 -0500 by bough

Wuenda machine learning training 2: Logistic regression

The Logistic Regression problem is actually a Classification problem. 1. Mathematical model It can be seen from the above figure that since the probability of y=1 is required finally, sigmoid function is added on the basis of linear regression to map z value to interval [0,1]. When Z ≥ 0, g(z) ≥ 0.5, y=1 can be inferred, o ...

Posted on Mon, 18 Nov 2019 11:40:53 -0500 by kmussel

5. Spring cloud integrates mybatis annotation method

Public address: java paradise 1. In the previous article, we learned about service provider, but we didn't just learn about service provider. In the middle, Hikari data source and spring cloud are used to integrate mybatis. However, when using mybatis in the previous article, the old method is still used, and the corresponding xml file of mapp ...

Posted on Mon, 18 Nov 2019 11:05:36 -0500 by allistera

UDP programming of Java Socket programming

For more information: https://www.yuque.com/shizhiy... UDP programming of Java Socket programming UDP (User Datagram Protocol) is connectionless, unreliable, unordered and fastIn data transmission, first define the data to be transmitted as Datagram, and limit the size to 64k. In the Datagram, indicate the Socket (host address and port number) ...

Posted on Mon, 18 Nov 2019 10:03:01 -0500 by sandrob57

Understanding and solving Java Concurrent modification exception

I don't know if the reader has encountered the similar exception information Exception in thread "main" java.util.ConcurrentModificationException in the process of Java development. The following is a brief introduction to the cause of the exception and the improvement method of the exception. The content is very simple. If there is a ...

Posted on Mon, 18 Nov 2019 09:42:26 -0500 by dgiberson

Python selenium element positioning

I. html The following HTML file is the form.html to be used later. The page is roughly as follows: <!DOCTYPE html> <html> <head> <title>Search element</title> <meta charset="utf-8"> </head> <body> <div id="container"> <form> user:<input type="text" n ...

Posted on Mon, 18 Nov 2019 09:40:49 -0500 by Zack

namespace and use in php

For object - oriented programming, the concepts of namespace and use are very important 1. The root namespace is a backslash \, which is a bit similar to the root directory / in linux, but when using the var_dump() function to print, it is actually an empty string 1 var_dump(__NAMESPACE__); 2 //string(0) "" 2. For the child namespace under th ...

Posted on Mon, 18 Nov 2019 09:03:43 -0500 by zoooj

[springboot development monomer web shop] 6. Commodity classification and round robin advertising display

Commodity classification & Round advertising Recently, I was trapped in the POC of OSGI technology. The update progress is a little slow. I hope you don't blame me. Upper segment We have implemented the front-end display after login, such as: Next, we will realize the function of the left classified column. Product category From the abov ...

Posted on Mon, 18 Nov 2019 06:52:00 -0500 by jawaking00

Very intimate wheel FreeSql

Since the development of FreeSql project on November 28, 2018, the version has been released to v0.3.12. Version rule: number of years month day version number of the day. At present, it mainly includes the maintenance and development of FreeSql and FreeSql.Repository. This article introduces some intimate functions. Error: the incoming reques ...

Posted on Mon, 18 Nov 2019 04:54:46 -0500 by songwind