Programmer Group

C + + constructors and destructors are used for object initialization and cleaning. When each class is defined, three functions will be created by default - constructors, destructors and copy constructors 1. Default constructor Constructors are similar to python's__ init__ Method, which is called automatically and only once when the class is in ...

Similar string Give you a list of strings strs. Each string in the list is an alphabetic word for all other strings in strs. How many similar string groups are there in strs? Using the idea of joint search set, the string array is transformed into a graph to find the connected edge class Solution { public: vector<int> f; int fi ...

Before you get familiar with factory mode, you should first understand the six guidelines before writing c + + programs Opening and closing principle: do not modify existing codes, only add codes.Dependency Inversion Principle: use abstract classes instead of concrete classes to solve problems. (isolation change, package change)Richter substit ...

Day1 Reference What is a reference A reference is a pointer. A reference is just a high-level modification based on correction to make the code easier to read. A reference is a reference to an existing variable. In other words, "reference variable" must refer to an existing variable. It is not a new variable itself. They do not rea ...

Thread safe object creation, callback and Deconstruction in C + +It is not difficult to write thread safe classes. You can use synchronization primitives to protect the internal stateMost STL classes are not thread safe and need to be locked externally to ensure simultaneous access by multiple threadsSecure object creationThe only requirement i ...

Recursion and recursion (2) 1.Simple Fibonacci The following sequence 0 1 1 2 3 5 8 13 21... Is called Fibonacci sequence. This sequence starts with Item 3, and each item is equal to the sum of the first two items. Enter an integer N, please output the first N items of this sequence. Input format An integer N. Output format Output the fir ...

Portal 1 perhaps Portal 2 Note that the space limit is 8MB! This question is too comprehensive. If you can write it independently, it means that you can get gold at Macao station. In addition, the space complexity of tree chain subdivision optimization is really the first time I heard~ Firstly, it examines a conclusion of game theory: in the ...

Note: the coding tool is CLion+Cygwin64 catalogue Difference from C constant C language C++ Reference and constant reference Exchange two variable values by reference const reference function overloading C language C++ Default parameter Special writing method of invisible parameter variable name Preliminary study on class Boolea ...

This week is also not much, no week I am satisfied with, no sense of knowledge to enrich, feel pushed by the task, plan the weekend two days to brush topics and organize evening homework, but really not as good as to do it in advance. On Sunday, I temporarily added two thought reports, a love letter, and I was very speechless. I hope I can ...

Bit operation Pilot brother Title Link Problem solving ideas: Each switch of the chessboard has two states: on or off, so the total number of States is 2 16 2^{16} 216. The range of int is not ...