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What is a transaction? Transaction is to treat a series of actions as an independent unit of work, which are either completed or ineffective. Attribute ACID of transaction: 1. Atomicity: a transaction is an atomic operation consisting of a series of actions. The atomicity of a transaction ensures that the actions are either completed or inef ...

Set type of redis value basic data type 1. Why characteristic disorderduplicate removal Application scenario Collection operation. Finding intersection, union and difference sets Random events. Solve the lottery problem: 10 prize users < 10, and the winning points of users are whether to repeat or not Positive number de du ...

Experimental environment Windows 10+DEV-C++ dynamic programming Dynamic programming is a hot topic in algorithm design and analysis. If the optimal solution of a problem (usually the maximum or minimum value) is required, and the problem can be decomposed into several problems, and there are overlapping subproblems between small problems ...

Don't stay in pursuit of the wind and the moon. The spring mountain is at the end of Pingwu. 1, Web page analysis Open URL Comparison verification platform Open the developer mode and refresh the web page. When you look down, you notice a request for refresh URL The requested data is It just corresponds to the content in the web page. ...

Optimization ideas Pinduoduo coupon https://www.fenfaw.net/ There are two main optimization directions: Reduce the number of rerenders. Because the heaviest (longest) part in React is reconnection (which can be simply understood as diff). If you don't render, there will be no reconnection.Reduce the amount of calculation. The main purpose is ...

brief introduction The remoting module of RocketMQ is the basis of communication among RocketMQ client, consumer, NameServer and Broker. It is implemented through the netty framework. The inheritance structure of the core class is as follows: The RemotingService interface defines the start(), shutdown(), registerRPCHook() methods. The re ...

1. Given an array arr, find the de duplication array pair with the difference of k public static List<List<Integer>> allPair(int[] arr, int k) { HashSet<Integer> hashSet=new HashSet<>(); for (int i = 0; i < arr.length; i++) { hashSet.add(arr[i]); } List<List<Integer>> list=new ArrayList<&gt ...

Cookies and session s: Difference between cookie and session: Cookie data exists locally, while session data exists on the server side. Session is more secure than cookie. cookie: it is used to remember what the client has done during the http session. It can solve the problems such as advertising on the first landing page. The server and the ...

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Effect video Jump to Baidu map for route calculation and navigation Route calculation and navigation in APP Function realization Jump mode implementation Function Description: by initializing Baidu map API, obtain the longitude and latitude of the current position as the starting point, and the entered address as the destination, t ...