Programmer Think

1, Introduction Geometric moment was proposed by Hu(Visual pattern recognition by moment invariants) in 1962. It has translation, rotation and scale invariance. These seven invariant moments form a set of characteristic quantities, Hu M. K proved that they are invariant to rotation, scaling and translation in 1962. In fact, in the process of o ...

Problem description Recently, during the process of using the latest version of nacos and feign, an error was encountered during startup: Caused by: java.lang.IllegalStateException: No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalancer? Puzzled, the previous version of spring cloud did ...

This article is transferred from: https://www.cnblogs.com/willick/p/csharp-enum-superior-tactics.html , please click the link to view the original text and respect the copyright of the landlord. At the beginning of the article, I'll give you an interview question: When designing the database of a small project (assuming MySQL is used), if ...

1 linked list structure The sequence table has the following disadvantages: When inserting or deleting nodes, it is often necessary to move a large amount of dataIf the table is large, it is sometimes difficult to allocate enough memory space, which may lead to memory allocation failure and unable to store In order to overcome the shortcomin ...

BGP routing principle When Huawei routers have multiple routes to the same destination, BGP selects routes according to the following policy sequence: If the next hop of this route is unreachable, ignore this route The route with the highest PrefVal is preferredThe route with the highest Local_Pref is preferredLocal originating BGP routes ar ...

preface❤️ The gentle sunset is always mixed with poetry and distance ❤️ 1, PC side web page effects (1) Element offset offset series 1.1 offset overview Offset translates to offset. We can dynamically get the position (offset) and size of the element by using the relevant attributes of offset series. Obtain the position of the element ...

The author's original intention is very simple: because one day the flame of group chat that has lasted for a long time suddenly disappeared... So he made up his mind to complete the script program that can automatically send messages At present, there are three ways to realize it: Mobile terminal (qnotified & other modules supporting j ...

The first time I wrote a blog, my original intention was to share my knowledge with you. Also pour down their own, uncomfortable and happy in the process. If you want to see the process, just look at it. What you don't want to see can also be directly at the bottom? Take the code away. Cause: it's because my girlfriend and another friend who i ...

catalogue Test data preparation Build table Initialization data How to use EXPLAIN Attribute analysis id select_type table column type possible_key,key key_len ref rows filtered Extra EXPLAIN statement provides information about how MySQL executes SQL. It is an artifact of SQL optimization that we must master. EXPLAIN on the o ...

1. HTTP protocol    HTTP (hypertext transport protocol) protocol, which specifies the rules for mutual communication between browsers and World Wide Web servers. 1.1 characteristics of HTTP protocol Support client / server mode. Simple and fast: when a client requests a service from the server, it only needs to send the reque ...