Programmer Group

preface Continue to briefly summarize the tool classes for concurrent process control in Java. This article summarizes CountDownLatch and CyclicBarrier CountDownLatch Latch means door latch in Chinese. CountDown means CountDown. Count down to 0 and the door latch is opened. You can see the usage scenario of this tool from the name. For e ...

Title Description: let a machine be controlled by n It consists of two parts, and each part can be m From different suppliers. supplier j Supplied parts i With weight Wij And price Cij . Design an algorithm to solve the total price does not exceed the upper limit c The minimum weight of the machine. (design a branch a ...

        There are six tables in the online library with duplicate data, two of which are relatively large, one 960000 + and one 300000 +. Because the same problem has been handled before, we directly brought the last Python de duplication script. The script is very simple, that is, connect to the database, find out the dupli ...

Mstring infrastructure #ifndef MSTRING_H #define MSTRING_H #include<iostream> using namespace std; #define MSTRING_NUM_SIZE sizeof(int) / / reference count size #define DEFEALT_LEN (10+MSTRING_NUM_SIZE) class Mstring { public: Mstring(const char* str); Mstring(const Mstring& src); Mstring& operator=(const Mstring& ...

summary         Continue with the previous chapter: Daily class - handwritten ArrayList - Generic , this article will talk about the implementation details of the iterator of ArrayList. Due to space constraints, this article first implements the one-way iterative method iterator(), and the two-way iterative listIterator() ...

Process concept A process is a running program, such as QQ, that starts a process and the operating system allocates memory for that process. When we use Thunder, a process is started, and the operating system will allocate new memory space for Thunder.A process is either an execution of a program or a running program. Is a dynamic process: th ...

The main contents are: boundary filling cv2.copyMakeBorder(), numerical calculation   cv2.add(), change size   cv2.resize(), image fusion   cv2.addWeighted(), image threshold   cv2.threshold() Before we start, let's import the images, which we need in the img. An image display function is defined to facilitate the next dra ...

1. Concept lambda expressions are a new feature added in Java 8.More generally, a lambda expression is like an anonymous method: it provides a list of formal parameters and the body of the statement represented by these parameters.The evaluation of lambda expressions produces Functional interface Examples of. The evaluation of the expression w ...

Structure can systematically link several variables together, which can solve a lot of trouble in some examples. Examples are as follows: To register patients for medical treatment, prepare a procedure to arrange the registered patients in the order of medical treatment according to the following principles: Elderly (age ≥ 60)   Age) ...

Preface Due to the influence of many factors in the actual modeling process, its objective function or constraints are difficult to be expressed in a linear relationship. The optimization of such non-linear problems is called a non-linear programming problem, which is basically defined as an extreme value problem of an n-ary function under the ...