iOS Performance Optimization

... 导读 Performance is especially important for iOS app development. If your app is unresponsive or slow, disappointed users will fill their disappointment with App Store reviews. However, due to the limitations of iOS devices, sometimes it is difficult to do a good job. You will have a lot...


Do-it-yourself use c++ to implement hash table

... 哈希表 找效率约为1 Implementation of ideas 普通ash thought 未递template, simple implementation key is int, value is string , the input key value is calculated by the hash function, and the number of the bucket to be placed is calculated. Use an array of pointers to record each bucket There are 50...


The working principle of the hard disk

... working principle of the hard disk 0. Background 近(201804) took over a project, is to do a voice player, read the files in the SD card, involving the file system And the technology of playing, the project is finished, but the understanding of the file system is limited to the...


HiEX Exchange earns 300 methods on the 0th day!

... HiEX Digital Currency Exchange is very hot recently! HIEX is the first to launch the function of trading bank in the trading field. The newly created self-owned brand HIEX BANK has made people dubbed the “Yue Bao” in the field of digital assets. Recently I found a good way to get 0. I...


#112-[广搜] Program Dragon's game

... 题描述 In oiclass, the program dragon likes to play games with the children. Today, he has thought of a fun game. Game rules: Every time you click on a child, he and his surrounding children will change their status (the squat becomes a standing one, and the standing one becomes a squat)...


[NOIP2014] Solving the equation

... // This question should be considered in the direction of the model when looking at the data range. 30分法, directly push, bring in. 50 points I heard that I can be high-precision, not doing it. 100 A very obvious idea is to enumerate x in [1,m] and then substitute the equation to see if...


Sub-object basic concept and its usage

... 一,What is the sub-object when A member of a class is a class of an object , the object is a sub-object, an object residing in another object, in a class In the definition, declare an object of another class as a member variable. 二, what is the role of the sub-object 减少-reuse code When...


iOS ---[Development adaptation iPhone XS, iPhone XS Max, iPhone XR]

... Summary for the following: 一, Screen size adaptation Three mobile phones, respectively iPhone XS , iPhone XR, iPHone X Max, where the screen size of the iPhone XS is the same as that of the iPhone X, and the other two models have new dimensions. The specific dimensions are as follows:...


Detailed model / version number / serial number / registration code

... National Copyright Bureau to check the company's software legalization work, Microsoft's personnel will naturally come. Operating system requirements use genuine, it involves the operating system serial number / authorization. Because of the leadership of non-computer majors, it is very...


Eight sorts - bubble sorting

... 一: Bubble sorting algorithm principle 1. Compare adjacent elements, if the first one is larger than the second, exchange them (small to large sort). 2. Do the same for each pair of adjacent elements, starting with a pair of last pair, so that the last element must be the largest. 3....