Programmer Think

Write a program, can realize a number from one base to another base. There are 62 different digits {0-9,A-Z,a-z}. Input format Enter an integer for the first row to represent the number of rows to follow. Next, each line contains three numbers, first input base (decimal), then output base (decima ...

Preface I'm an Android Developer. I'll just introduce the hybrid development of Android and Flutter here. There are many related articles on the Internet about the mixed development of native and Flutter, which are basically done by using the methods of FlutterView and FlutterFragment. However, in th ...

IOS docking CC video interface On demand interface document Live interface document Docking process: 1. Implementation of HTTP communication encryption: The request parameter hash of CC video interface needs to be composed of other request parameters and api key with salt value hash. First, the common query parameters (in ...

Multi level expansion menu based on Bootstrap layout Tutorial address: Original address (YouTube) Tutorial of station B: Original reprint (bilibili bili) The content of the two videos is the same, and the second is reprint Design sketch [external link image transfer failed. The source station may h ...

Title: The meaning of the problem is transformed into a graph theory problem: given a undirected graph with m points, the maximum independent set is obtained. (m≤40)(m \leq 40)(m≤40) Links: https://codeforces.com/contest/1105/problem/E Solutions: It is obvious that the direct state pressure ...

Title: l+1) * a − I = l Σ r ci − gap (L, R), where gap(l,r)=max ⁡ i=l+1r(di − di − 1) 2gap (L, R) = \ Max \ limits {I = L + 1} ^ R (D_ i-d_{i-1})^2gap(l,r)=i=l+1maxr​(di​−di−1​)2. (n≤3×105)(n \leq 3×10^5)(n≤3×105) Links: https://code ...

I want to display the current language used by the device UI. What code will I use? I want it to appear as an NSString in a fully spelled format. (not @ "en UUS") Editor: for those who continue to move forward, there are a lot of useful comments here, as the answer evolves with the new version of iOS. #1 building For Mono ...

In the iOS development process or user feedback, you may often see this situation. When you use it, you will crash. When you check the crash stack in the background, you cannot find the crash log. In fact, most of this may be due to the system's low memory crash, that is, oom (another possibility is tha ...

Recently, I am working on Xamarin Forms project. I believe you are unfamiliar with Xamarin. In fact, it is also a cross platform technology. Please refer to the following official document to understand. What is Xamarin.Forms? Xamarin.Forms is an open-source UI framework. Xamarin.Forms allows deve ...

Explain TouchId fingerprint recognition, FaceId face unlocking, collectively referred to as biometrics. Realization Introduce the Local Authentication Framework. If it's iOS 13, it's available by default. You don't need to re introduce it. import LocalAuthentication Check that biometrics are avail ...