Programmer Think

preface I haven't updated it for a long time. One is that I don't have time. The other is that I may pay more attention to an opportunity. I'm afraid to write wrong in semi familiar fields, and I dare not write in too familiar fields. Only things I just touch dare to write indiscriminately. Well, it's just the sentence that newborn calves a ...

Cashier Noun interpretation Merchant No.: third party account, account merchant (e.g. WeChat merchant account, Alipay merchant account, Jingdong merchant account).Resident: refers to the user accessing the cashier Target income Improve service access capabilityBuild efficient delivery capabilitiesReduce maintenance costs Cashier targe ...

catalogue Constant and Variable variable Location of variables Scope life cycle constant ① Literal constant ② const modified constant ③ #define defined identifier constant ④ Enumeration constant String type ASCII code table Escape character Constant and Variable variable Variables can be divided into local variables and glo ...

1 Introduction to gitlab GitLab is developed by GitLab Inc Develop and use MIT licensed web-based Git warehouse management tool with wiki and issue tracking functions. Use Git as a code management tool, and build a LAN based web service on this basis. GitLab was developed by Ukrainian programmers Dmitry zaporozhets and Valery Sizov. It is ...

1. Disadvantages and advantages of MySQL single server Disadvantages: Single server If disk problems occur, database data will be lost Backup of a single server makes it difficult to automatically and regularly back up data files if they are backed up locally Single server can not handle high concurrent reading, only a single one, read and ...

Redis official website: https://redis.io Redis Chinese official website: http://www.redis.cn The following is an overview of Redis data types, which can be read intuitively by using code blocks. 1, Base point 1. There are 16 Redis databases by default, and the first one is used by default. Use select to switch databases. 2. The default port ...

Problem introduction   this problem is actually related to Integer to Roman The numbers are equivalent. Programming ideas Write some complete conversion functions (including 400, 900, 40, 90, etc.) Map<String, Integer> transfer = new HashMap<>(); transfer.put("I", 1); transfer.put("IV", 4); transfe ...

Preface Basic Operators These are common in most programming languages, but take them out and write one. Here, only some of the most commonly used operators are introduced, others are not commonly used to pick them up when they are used. Basic Operators 1. Common binary operators +, -, *, /,% 1. Addition Operator (Sum Operator)+ The ...

Spy network Title Link: ybt gold navigation 3-5-5 / luogu P1262 General idea of the topic There are some people, some of them, you can catch them, and then there is a fee. Then after a person is caught, he can help you catch some people. Ask if you can catch everyone with the minimum cost. If you can output the minimum cost, otherwise output ...

Apache apisid is a dynamic, real-time and high-performance API gateway based on OpenResty and Etcd. At present, it is already a top-level project of Apache. It provides rich traffic management functions, such as load balancing, dynamic routing, dynamic upstream, A/B testing, Canary release, speed limit, fuse, defense against malicious attacks, ...