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tree Definition and related concepts of tree Start with the linked list and diagram Linked list In the previous content, we learned the basic data structure of linked list. Single linked list is one of them. The structure form is as follows: # Definition for the singly-linked list. Class ListNod: def __init__(self, val=0, next=Non ...

prefacestay "A blog with VuePress + Github Pages" In, we used VuePress to build a blog. The final effect is as follows: TypeScript Chinese document. Because VuePress's built-in search will only build the search index for the title, h2, h3 and tags of the page. If you need full-text search, you can use Algolia search. This article talk ...

1.Redis cache double write consistency2. Several update strategies for database and cache consistency2.1 update the database first and then the cache2.2 delete the cache first and then update the database2.3 update the database first and then delete the cache2.4 update the cache first, and then update the database3. canal of the implementation ...

This article is an official article on nginx If is Evil... when used in location context Translation and understanding. 1. Introduction There is a problem with the if instruction in the location block. In some cases, the if instruction will not work as we expected, but may develop in a completely different direction and even cause errors. T ...

Learn more about and use ThreadLocalWhat is ThreadLocal This class provides thread-local variables. These variables differ from their normal counterparts in that each thread that accesses one (via its get or set method) has its own, independently initialized copy of the variable. ThreadLocal instances are typically private static fields in clas ...

Create a comfortable writing environment (Hexo) use Hexo Toss and run the static website for a long time. I haven't sorted out the construction experience in this regard. Recently, I'll write about the construction process of this website and the way of updating articles. Well, the main thing is to record the white whoring posture of various re ...

RecyclerView usage recordAs the function & requirements of the company's own app client become more and more complex, the layout of some pages becomes more and more complex. At the suggestion of former colleagues, use RecyclerView to implement it.demandThe general requirements are shown in the figure below. The table layout needs to be disp ...

There are N communication base stations in the suburbs, P two-way cables, and the i cable connects the base stations Ai and Bi. In particular, base station 1 is the main station of the communication company, and base station N is located in a farm. Now, the farmer wants to upgrade the communication line, and upgrading the i Cable Costs Li. T ...

Official interpretation: LockSupport is the basic thread blocking primitive used to create locks and other synchronization classes; LockSupport class uses a concept called permission to block and wake up threads. Each thread has a permission; permit has only two values: 1 and zero. The default value is zero; You can think of a license as a ...

1 . concept 1.1 true and pseudo-random numbers Most computer languages provide API s for generating random numbers, which are called random number generators. Computers can use random numbers to simulate various random probability problems in the real world. The programming language without random generator is not a "good language&q ...