Encapsulating rapid JSON for database and network data transmission

background I want to complete json as the data medium to operate the database and network transmission. Looking up the data, we found that rapid json is a popular json library, and it is fast. But in my way of use, it's very cumbersome to use, and my purpose is data exchange. Rapid json is very common. It seems that it should be a value transfe ...

Posted on Sat, 27 Jun 2020 21:28:01 -0400 by rajeevbharti

Luogu P3391 [template] Splay (fhq tree)

Topic background This is a classic Splay template topic - Art balance tree. Title Description You need to write a data structure (refer to the title of the title) to maintain an ordered sequence, in which you need to provide the following operations: flip an interval, for example, if the original sequence is 543.21, and the flip interval is ...

Posted on Wed, 03 Jun 2020 12:21:35 -0400 by craigh

luogu1758 [NOI2009] pipeline bead taking

Title Link solution We can turn the problem into two games, and finally output the same number of solutions. Why can it be so transformed? We try to express this new problem with the formula. For a sequence \ (i \), if we get the number of his schemes in a game, it is \ (a_i \), then according to the multiplication principle, the number of his ...

Posted on Thu, 28 May 2020 10:33:42 -0400 by manmanman

C++98/11/17 Expression Categories

target Can the following code be compiled and passed, and run as expected?(Click to expand)#include <utility> #include <type_traits> namespace cpp98 { struct A { }; A func() { return A(); } int main() { int i = 1; i = 2; // 3 = 4; const int j = 5; // j = 6; i = j; func() = A(); return 0; } } name ...

Posted on Sat, 23 May 2020 12:44:44 -0400 by luzlin

C + + basic string object

1, Basic use of string object The string data type is provided in the C + + standard template library, which is specially used to process strings. String is a class. Variables of this type are called "string objects" 1. To use the string object in a program, you must include the header file string in the program, that is, at the begin ...

Posted on Sat, 23 May 2020 10:52:25 -0400 by somenoise

Noip2017 improves D1T2 time complexity

I didn't mean to brush the outrageous network flow today and finally filled in this mass grave   First of all, we know that this is a simulation problem. Then, this is a simulation to be judged wrong. Finally, this is a simulation problem of data diversification. 1 #include<cstdio> 2 #include<cstdlib> 3 #include<cstring> ...

Posted on Thu, 21 May 2020 10:46:38 -0400 by archbeta

Parse C++ exception handling

​ Author: Conscience Stills Reporting Authorization and Outlook: Welcome to add WeChat: Allen-Iverson-me-LYN executive summary There are often problems encountered during the running of a program, such as array subscripts crossing bounds, dividing by zero, etc. If these errors are not found and handled, our code is likely to cause the program t ...

Posted on Thu, 14 May 2020 23:59:30 -0400 by tlenker09

opencv-12-gaussian filter-bilateral filter (with C + + code implementation)

Before you start In recent days, I haven't written for my own reasons. One is that I'm lazy. The other is that I don't want to write down some problems I have encountered here. Let's try to finish this chapter first. Before that, I introduced the more commonly used and well understood mean and median filtering. However, in the routine Smoothing ...

Posted on Sun, 10 May 2020 05:52:58 -0400 by stunna671

Android P HIDL demo code writing (original)

Previous articles have analyzed the registration and invocation of HIDL service, and this article summarizes how to write the next HIDL service. Abbreviated HAL file First of all, you need to confirm the package name of the folder and interface, because this is related to the use of script to generate some code. Generally, it is placed in the h ...

Posted on Thu, 07 May 2020 07:08:55 -0400 by Ph0enix

LOJ ා 115. Upper and lower bound feasible flow of passive sink

#115. Passive sink has upper and lower bound feasible flow describe This is a template problem. n n n points, m m m edges, each edg e e e has a lower bound of flow (E) \ text {lower} (E) lower bound (E) and upper bound of flow (E) \ text {upper} (E) upper bound (E). A feasible scheme is found to make all edges meet the flow limit o ...

Posted on Tue, 05 May 2020 10:58:38 -0400 by ishboo