Programmer Group

CF 797C • given the lowercase letter string s with length n, and the empty string t, u, two operations Add the first character of s to the end of t Add the last character of t to the end of u • find the string u with the smallest dictionary order (the length must be n, i.e. s, t and the last e ...

CF1183 F I'm going to give you n numbers. I'm going to ask you to select at most 3 numbers. The numbers that don't divide each other make the sum the maximum. The method is to enumerate a selected number x from large to small And then he never divides all his numbers by the largest y And then never divi ...

D. 1-2-K Game time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output Alice and Bob play a game. There is a paper strip which is divided into n + 1 cells numbered from left to right starting from 0. There is a chip placed in the n-th cell (the last one). Players take turns, Alice is first. Each ...

Just passed, I also wish you all good health, everything goes well and no more bugs in your future life. I. Preface I wrote an article about uploading directory file: Solution of directory file upload (not only pictures and videos) in uni app system , this time to solve the file preview problem.   uni-app It is a framework that uses Vue.js to d ...

MetriKit is a new framework for collecting and processing batteries and performance metrics in iOS 13. This is WWDC working with XCTestMetrics and Xcode Metrics organizers this year as part of a concerted effort to bring new insights to developers about the performance of their applications in this area. Apple will automatically collect Metr ...

There is a hole in the saved image in the quick application. If you step on it, you will be hit. Here, you should also distinguish Huawei from other manufacturers. Although there is no problem with the debugger provided by Huawei and the official suppliers, Huawei mobile phones cannot be saved after the application goes online. 1. different poi ...

https://vjudge.net/contest/311526#problem/G General idea: given n(50) attributes, each attribute has a[i](500) level, a n d there are M(2000) courses. To participate in j course, c attribute should reach D. In this way, you can upgrade your e attribute to f, and spend g yuan at the same time. Ask h ...

1. There are two types of certificates @1. The certificate purchased from the certification authority (each certificate purchased by our company requires 4000 yuan, TMD, rather than renting an additional server). If the server uses such a certificate, it can directly ignore the certificate for the m ...

Runloop is a basic component closely related to threads, and it is behind many functions related to threads. This article will summarize runloop from the following aspects: What is runloop The role of runloop The relationship between runloop and thread Detailed introduction of runloop and source code analysis Analysis of runloop principle runl ...

Since then, I have no intention to love good nightLet him go down to the West Tower in the bright moon Preface Count the number of subviews on a view. Subviews containing subviews Realization way recursion DFS depth first traversal queue BFS breadth first traversal code implementation recursion Thoughts: Return 0 when the view is empty Retur ...