Programmer Think

1. Concept and implementation of thread communication 1.1. Case interpretation 1.1.1. Analysis diagram1.1.2. Case description1.1.3. Case implementation (no synchronization, no thread communication)1.1.4. Implementation effect and exception1.1.5. Anomaly analysis1.1.6. Exception resolution 2. Use the wait and notify methods in the ...

Full Permutation (leetcode_46) subject Given a sequence without repeated numbers, all possible permutations are returned. Example: Input: [1,2,3] Output: [ [1,2,3], [1,3,2], [2,1,3], [2,3,1], [3,1,2], [3,2,1] ] Problem solution The backtracking method solves the problem. i exchanges with first to generate a new sequence, and constructs a ...

1. Introduction of Apriori correlation analysis This part can be seen in my last blog post, which mainly introduces the principle of correlation analysis. Link: Relevance analysis of python machine learning (Apriori). 2. Case background and analysis process There are many kinds of modern goods, and customers often struggle with what to buy. ...

Project address: https://gitee.com/caochenlei/design-pattern Chapter 1 Introduction to command mode Introduction to command mode: In software development system, there is often a close coupling relationship between "method requester" and "method implementer", which is not conducive to the expansion and maintena ...

preface When you use the browser to surf the Internet, almost all browsers have a back button. After you click it, you can return to the previously loaded web pages in reverse order of access order. There are many similar operations in life. Using word undo, their principle is a data structure we will introduce next - stack. 1, What is a ...

Introduction: In previous chapters, we used form to submit requests. In this chapter, we will learn a new way to submit requests: Ajax. It is a new way to interact with the back end. Let's learn about it! Ajax 1, What is Ajax AJAX (Asynchronous Javascript And XML) is translated into Chinese as "Asynchronous Javascript And XML ...

catalogue 1: Table creation code 2: Data model 3: partition by range 4: hash bucket V other 1: Table creation code CREATE TABLE `heheyotubehehe_ads_people_kehuduan_experience_data` (   `day` int(11) NOT NULL DEFAULT "0" COMMENT "",   `os` varchar(50) NULL COMMENT "",   `soft_version` varchar(50) NULL COMMENT "",   `is_app_new` varc ...

Responsiveness of foundation type - ref coupon https://m.fenfaw.cn/ In vue3, we can realize the responsiveness of reference types through reactive. How to realize the responsiveness of basic types? You may think of this: const count = reactive({value: 0}) count.value += 1 This can indeed be achieved, and it is very similar to the use of Re ...

OOP Key content in Java! What is OOP OOP: Object Oriented Programming Java is object-oriented. OOP is a process of using java language to describe objectively existing things and things, and using the logic of the program to connect these things and things and interact for a certain purpose. Therefore, you must be familiar with OOP in or ...

Reprinted from: https://blog.csdn.net/mvtechnology/article/details/45041771 In essence, image filtering and enhancement processing is to use filtering technology to enhance some spatial frequency features of the image, so as to improve the gray contrast between the ground object and the field or background. The possible "blurring" eff ...