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knapsack problem Given a group of items, each item has its own weight value. Within the limited weight, how can we choose to maximize the total value. Three kinds of backpacks 1. 01 backpack: each item can only be selected once 2. Complete backpack: there is no limit to the number of choices for each item 3. Multiple backpacks: each item ca ...

What is a Lambda expression?Lambda expressions are actually anonymous functions. In fact, a function is a function. An anonymous function is an anonymous function code. In Kotlin, function also appears as a type. Although in the current version, the flexibility of function type is not as flexible as Python, it can also be assigned and passed, w ...

LinkedList source code interpretation Inheritance structure of LinkedList Properties of LinkedList LinkedList constructor The core method of LinkedList FailFast mechanism Inheritance structure of LinkedList public class LinkedList<E> extends AbstractSequentialList<E> implements List<E>, Deque<E>, ...

Continued [basic knowledge] basic knowledge of RMAN - Part1 Use two articles to sort out the contents learned before and do the experiment again. There are both commonly used and not commonly used. There are many points that can be deeply dug. We'll do it later 1, Configure backup set - backup slice - compression - Encryption 1. Configure the ...

What is a module Module is equivalent to the toolkit in python, which packages the code of specific functions into modules and calls them when needed Module benefits Lightweight program: the module can simplify the software and speed up the reading speed. It can be called when neededConvenient reference: package the code of specific function ...

0. Case environment 0.1 case data initialization sql CREATE DATABASE /*!32312 IF NOT EXISTS*/`mybatis_db` /*!40100 DEFAULT CHARACTER SET utf8 */; USE `mybatis_db`; DROP TABLE IF EXISTS `orders`; CREATE TABLE `orders` ( `id` int(11) NOT NULL AUTO_INCREMENT, `createtime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMEST ...

Computer vision quick start learning notes Great cause needs great theory to guide. Code without theory is a rogue I Overview of artificial intelligence Turing test: in 1950, Turing put forward the Turing test, that is, a person carries out a series of questions and answers with the other party in a special way without contacting the other ...

Machine learning algorithms usually use cross validation techniques such as kFold to improve the accuracy of the model. In the process of cross validation, the prediction is carried out through the split test set that is not used for model training. These predictions are called out of fold predictions. External prediction plays an important rol ...

zabbix distributed monitoring 1, Overview of zabbix distributed monitoring ​ 1.Zabbix provides effective and available distributed monitoring for IT infrastructure through Zabbix proxies Proxies can be used to collect data locally instead of Zabbix server, and then report the data to the server. ​ 2.proxy feature When choosing to use / n ...

preface This article will briefly introduce the static proxy of java and the dynamic proxy of JDK. Recently, I was studying JAVA related knowledge and found that the relevant explanations of agents on the Internet are too messy, so I sort them out here for reference. I have little engineering experience, so I don't know why to use the agen ...