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1, Introduction to inline It is estimated that anyone who has studied c + + knows the keyword inline. In the application of functions, there is the use of inline functions (for specific usage, please refer to the previous articles, which will not be expanded here). Inline function ensures that the function has the same copy in each compilation ...

——Common sorting algorithms Algorithm Introduction Sort / / sort the elements in the containerrandom_shuffle / / (shuffle) randomly adjust the order of elements within the specified rangeMerge / / merge container elements and store them in another containerreverse / / reverses the elements in the specified range sort algorit ...

268. Missing numbers Given an array num containing N numbers in [0, n], find the number that does not appear in the array within the range of [0, n]. Example 1: Input: nums = [3,0,1] Output: 2 Explanation: n = 3，Because there are three numbers, all the numbers are in the range [0,3] Inside. 2 is the missing number because it does not appea ...

For relevant concepts of Jason, see Simple use of C++ Json Library. 1. Define JSON value type If you want to create a JSON object in the following form: { "pi": 3.141, "happy": true, "name": "Niels", "nothing": null, "answer": { "everything": 42 }, "list": [1, 0, 2], "object": { "currency": "USD", "valu ...

Job 1 (Section2 to Section5) Write a C + + program to convert binary numbers to decimal numbers and convert decimal numbers to binary numbers. The program prompts the user to enter a number. You must read the number as a string. If the number is binary, convert it to decimal. If the number is decimal, convert it to binary. If the number is ...

Problem: there is an existing bmp picture. It is required to read it into the program and perform one of the four effects of graying, horizontal flip, blur and Tan filter, and output a new picture, as shown below: Command line input:   Of which: Parameter 1: - b/g/s/r, indicating blur, gray, sepia and row reverse successively ...

Go to: Map and unordered_ The difference and use of map_ Chen Yunjia's column - CSDN blog_ unordered_map and map C++STL: unordered_map - Ling Yao - blog Park The header files to be imported are different map: #include < map > unordered_map: #include < unordered_map > Different internal implementation mechanisms Map: a red bla ...

Six default member functions for classes If there is no member in a class, it is simply an empty class. Nothing in the empty class? No, any of the classes will automatically generate the following six default member functions if we don't write them. Constructor concept For the following date classes: class Date { public: void Init(int ...

catalogue 1, C/C + + memory distribution   2, Dynamic memory management in C language 3, C + + memory management mode 4, operator new and operator delete functions   5, Common interview questions The difference between malloc/free and new/delete: Memory leak: How to prevent memory leaks:   1, C/C + + memory distribution ...

preface This article will use OpenCV C + + for QR code detection. 1, QR code detection Firstly, we must preprocess the image and extract the image contour through gray, filtering, binarization and other operations. Here I also added morphological operations to eliminate noise and effectively connect rectangular areas. Mat gray; cvt ...