Solution to the transportation plan of Luogu 2680
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Brief introduction
nnn point edge weight tree gives mmm key chains. The weight of an edge on the tree is changed to 0, so that the maximum value of the sum of mmm chains is the minimum. n,m<=1e5n,m<=1e5n,m<=1e5.
thinking
Binary maximum kkk. Now consider how to te ...
Posted by mentalfloss on Sat, 11 Jan 2020 06:03:42 -0800
spring cloud gateway is configured with Zuul RateLimit current limiting
Reprinted from: https://www.jianshu.com/p/2fc92a929e8e
Narration
In order to prevent the API without token access from being called infinitely, some services need to be API restricted. It's like taking some interfaces for registration or sending verification codes. If they are called maliciously an ...
Posted by coalgames on Sat, 11 Jan 2020 00:54:04 -0800
An analysis of leetcode's solution 37-42 questions
Solution independence
Write a program to solve Sudoku problem through filled space.
This problem is mainly solved by backtracking. Select the row, column and block with the least space, and then fill in them. If there is a problem, backtracking is needed
class Solution {
public:
// Line, column an ...
Posted by corcode on Fri, 10 Jan 2020 20:38:26 -0800
[Matlab] PCA dimension reduction to realize face recognition (with learning materials, code program, notes and operation results)
PCA face recognition with Matlab
Winter vacation is coming, Mr. Wang summed up some of the things he learned in this semester, and came to share with you.
1, Theoretical knowledge basis
1. Experience sharing of some predecessors (not limited to these)
(1)PCA face recognition: a must for beginner ...
Posted by metkat on Fri, 10 Jan 2020 05:59:41 -0800
The differences between Python's assignment, slicing, shallow copy and deep copy
Preface
As a high-level language, Python is quite different from C/C + +. As for assignment, slice, shallow copy and deep copy, many people don't know them very well, which makes it easy to have unexpected results in some codes, and it's also hard to find the reasons. This article will talk about the difference and use of these kinds of situati ...
Posted by amargharat on Fri, 10 Jan 2020 00:53:21 -0800
Find out how many ways to ask a series of questions (find change)
Find out how many ways to solve a series of problems (find change)
Background:
Assume four denominations of money
1 yuan, 2 yuan, 5 yuan and 10 yuan, give me 10 yuan altogether
Then you can reward me 10 yuan or 10 yuan
Or 5 $1 plus 1 $5 and so on
If you consider the amount and order of each reward
So how many different rewards will there b ...
Posted by Popcorn on Thu, 09 Jan 2020 21:49:16 -0800
Naive Bayes algorithm: News Classification (Sklearn Implementation)
1. Steps of news classification based on Naive Bayes
(1) Provide text file, i.e Dataset Download
(2) Prepare data
The data set is divided into training set and test set, and the jieba module is used for word segmentation, word frequency statistics, stop word filtering, text feature extraction, and text data is quantified
Stop word text Stopword ...
Posted by AdRock on Thu, 09 Jan 2020 08:16:32 -0800
What is the effect of volatile keyword modification on objects?
If volatile modifies an object variable of reference type, will some of the common global variables defined in the object be affected by the effect of the volatile keyword?
Next, let's analyze this problem together! Let's review the role of the volatile keyword through an example first!
public class VolatitleFoo {
//Class variable
fin ...
Posted by saleemshehzad on Wed, 08 Jan 2020 08:39:26 -0800
Using less with koala software
1, Preparation process
The folder is as shown in the figure
The html code is as follows
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<link rel="stylesheet" type="text/css" href="./css/text.css">
</head>
<body>
</body> ...
Posted by Toshiba23 on Wed, 08 Jan 2020 08:21:07 -0800
How to implement paging query in Akka Persistence
In Akka Persistence, the data is cached in the service memory (state), and the back-end stores some persistent event logs, so it is impossible to use DSL like SQL for paging query. Using Akka Streams and Actor, we can achieve the effect of paging query by coding, and the paging query is still step-by-step parallel
EventSourcedBehavior
CQRS mode ...
Posted by kamurj on Wed, 08 Jan 2020 01:01:33 -0800