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Recently, a classmate came to me because his graduation project was about to be concluded. His project was to make a car that could recognize the QR code and realize ranging. At the same time, he also hoped that the car would keep a constant distance from the QR code. That is, when the QR code approaches the car, the car will retreat, and when ...

452. Detonate the balloon with a minimum number of arrows There are many spherical balloons in two-dimensional space. For each balloon, the input provided is the start and end coordinates of the balloon diameter in the horizontal direction. Because it is horizontal, the ordinate is not important, so it is enough to know the abscissa of th ...

Author: EllieSummerReact v16. After 8, Function Component became the mainstream, and the scheme of react state management also changed greatly. Redux has always been the mainstream react state management solution. Although it provides a set of standardized state management process, it has many problems that people have been criticized: too many ...

Anyone who has studied CSS knows that it is not a programming language. You can use it to develop web page styles, but you can't program with it. In other words, CSS is basically a designer's tool, not a programmer's tool. In the eyes of programmers, CSS is a very troublesome thing. It has no variables and no conditional statements. It is just ...

Functional programming Function is a kind of encapsulation supported by Python built-in. We can decompose complex tasks into simple tasks by disassembling large pieces of code into functions and calling functions layer by layer. This decomposition can be called process oriented programming. Function is the basic unit of process oriented pr ...

J - Cunning Friends Game theory: Main idea of the title: give n buckets, each bucket has several small balls, three people play the game, the first hand operates first, and the remaining two people are a group. If you want the first hand to lose, three people play the game in turn. Each candidate takes out > 0 balls in a bucket. When ...

I have no information about the front-end learning! But the most important thing is persistence! Preview (special effects: Web APIs,DOM,BOM) 1. Regular expression: user name; password; cell-phone number; Mailbox; Date. 2. Built in object: (parameter (mode, flag)) – > the parameter includes mode and flag mark; Modifier: i performs mat ...

In order to provide file access and CDN acceleration for multiple servers, I chose to use COS to store files. However, the official boot auto mount scheme is not stable. I study the use of cosfs tool and cooperate with systemctl to realize boot auto mount.Compared with the official / etc/fstab mount scheme, using systemctl to manage cosfs proce ...

What is mybatis plus? To explain mybatis plus, you must first explain what mybatis is: (1) Mybatis is a semi ORM (object relational mapping) framework. It encapsulates JDBC internally. During development, you only need to pay attention to the sql statement itself, and you don't need to spend energy dealing with the complicated processes such ...

Part of this article is from the art of Java Concurrent Programming volatile and synchronize keywords If each running thread only runs in isolation, it will have little effect. If multiple threads can cooperate with each other to complete the work, it will bring greater value Java supports multiple threads to access an object or its m ...