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const: ① Data member: must be initialized with an initialization member list. wbm(string name,const int age):name(name),age(age){} ② Constant member function: 1.const is at the end                             2. You cannot use this as an interface to modify data me ...

1. Pre order printing node [problem description] the algorithm is designed to print the leaf nodes of the binary tree in the way of preorder traversal. [input form] a line of string, which is the preorder traversal sequence of the extended binary tree, which is used to construct the binary tree. [output form] the pre order leaf traversal s ...

Favorite formula: Formula 1: \(\large f(n) = \displaystyle\sum^n_{k=0}\dbinom{n}{k}g(k) \\ \large \Rightarrow g(n) = \displaystyle\sum^n_{k=0}\left(-1\right)^{n - k}\dbinom{n}{k}f(k)\) Formula 2 (at most and exactly): \(\large f(n) = \displaystyle\sum^n_{k=m}\dbinom{n}{k}g(k) \\ \large \Rightarrow g(n) = \displaystyle\sum^n_{k=m}\left(-1 ...

Vector Vector is also one of the six components of STL. In short, it is a sequential container that encapsulates dynamic size arrays. At the same time, it can store various objects, such as int, char, string types and so on Because it is essentially a sequential container, it is stored in a sequential manner, similar to an array, and it ca ...

1, gtest events The event mechanism of gtest is actually another form of unit testing. It has two basic meanings: 1. It can process relevant data before and after specifying conditions and scenes 2. It can provide notification of results before and after specified conditions and scenarios The events in gtest are divided into three basic levels ...

Given ${N} $vertices, you can form a tree from these ${N} $vertices. If the tree has exactly three forks, we call this tree ${Y} $tree. Now, given ${N} $vertices, please find out how many ${Y} $trees can be built from these ${N} $vertices?    ###Input format: The first line of input gives the number of vertices ${N} $. ${4 \le N \le 10^{18}} ...

What is CMake If the software is to be cross-platform, it must be able to be compiled on different platforms. If you use the Make tool, you have to write a Makefile once for each standard. CMake is a tool designed to address these issues: it first allows developers to write a platform-independent MakeList.txt file to customize the entire compi ...

1，A. Long Comparison-Educational Codeforces Round 118 (Rated for Div. 2) Meaning: give x1,y1,x2,y2. X1 and X2 represent the cardinality, y1 and y2 represent the power of multiplying by 10 (for example, x1=29,y1=3, the number is 29000). It is required to judge whether X1 times 10 is greater to the y1 power or x2 times 10 is greater to t ...

1. Concept of function overloading Using function overloading to create functions enables users to use multiple functions with the same name. They do different jobs and use different parameter lists, but the function names are the same. Overloaded functions are like verbs with multiple meanings. The key to overloading a function is the paramet ...

Problem Description Every student in a school has to learn three public courses: Chinese, English and mathematics. Students majoring in accounting should study accounting and economics Two professional courses. Students majoring in chemistry should study two professional courses: Organic Chemistry and chemical analysis. (1) Write the ComFinal b ...