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ARTS Carding Activities - Third Week 1. Algorithms do an algorithmic problem of leetcode 146. LRU CacheDesign and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and put. get(key) - Get the value (will always be positive) of the key if the key exists in the cache, otherwise return ...

1. Concepts Idempotency, commonly referred to as an interface, makes the same request multiple times and must ensure that the operation can only be performed once For example: Order interface, order cannot be created more than once Payment interface, double payment of the same order can only be deducted once Alipay callback interface, may hav ...

Scrapy scrapy framework, asynchronous crawler framework. Synchronization and Asynchronization Synchronization: The next method relies on the previous method. If the previous method is not finished, the next method will not be executed. Asynchronou ...

Knowledge Points in the Process of Adding, Deleting and Revising 1. If we want to save the data we added, we can use the following way to check the additions and deletions of D language items. auto repo = new xxxRepository(_cManager); repo.save(xxx); //So we save the information in the data table. 2. How to Search Information in D Language a ...

1. Background Article browsing statistics, low's practice is: each time a user browses, the front-end will send a GET request for details of an article, the article will be + 1 browsing volume, stored in the database. 1.1 There are several problems with this: Write data in the business logic of the GET request! If the concurrency is high, th ...

1. Data indicators of Prometheus are obtained through an open HTTP(S) data interface. We do not need to install monitoring agent s separately. We only need to expose a metrics interface. Prometheus will pull data regularly. For some ordinary HTTP services, we can reuse this service directly. Add A / metrics interface to expose Prometheus2. Som ...

Catalog 1 Generator (Variation of Function) 2 Derivative Formula 3 Recursion 1 Generator (Variation of Function) Judging whether a function is a generator function: Just see if there is yield inside the function # Generator function (whether yield is included in it) def func(): print('F1') y ...

Preface Before that, we introduced the installation of RabbitMQ, the comparison of major message middleware, the core concept of AMQP, the use of management console, and the Quick Start RabbitMQ. This chapter introduces the advanced features of RabbitMQ. It is introduced in two parts (top/bottom). How can messages be delivered 100% successfu ...

Distributed-Redis-based Interface IP Current Limitation In order to prevent our interfaces from being accessed maliciously, for example, when someone accesses our interfaces frequently through JMeter tools, the interface response becomes slower or ...

There was a blog post written about the business logic of shopping cart, which used cookie s and redis to store the data of shopping cart of the unregistered and logged-in users. Although the business logic has been well completed, the redundancy of modern codes is very serious, and they are not Python-specific enough. Today let me use python-s ...