Programmer Think

The previous Blog described in detail how to quickly follow several middleware or servers and simply test and use them. As of the last article, two blogs were used to complete the form and bottom things, that is, how to play Docker. This Blog will talk about some principle level content, which is convenient for further use. There is a theoretic ...

1, Topic retelling leetCode algorithm Title: https://leetcode-cn.com/problems/H6lPxb/ Briefly described as: 1. Provides an array of strings. There are letter ectopic words between the string elements of the array. For example, "aaabb" and "baaab"; That is, the letters that make up the string are the same, and the letters ap ...

I Source code warehouse:zookeeperBased on branch 3.4.14, the startup process of branch in windows system is analyzed.II Process analysis:Source code entryThrough zkserver From the contents of CMD executable file, we can see that the server of zookeeper is through org apache. zookeeper. server. quorum. The main of quorumpeermain class is used as ...

Summary of while loop of ternary operator 1, Ternary operator Ternary operator of python Syntax: Value 1 if expression else Value 2 Operation rule: if the result of the expression is True, the result of the whole operation is the value 1, otherwise it is the value 2 # Case: if a is greater than 10, let a add 1, otherwise let a subtract 1 ...

1. Cache What is Cache? There is temporary data in memory. Put the data frequently queried by users in the cache (memory), and users do not need to query the data from the disk (relational database data file) but from the cache, so as to improve the query efficiency and solve the performance problem of high concurrency system. 2. Why c ...

background My girlfriend complained two days ago that a big V made a video with many popular expressions. Say the big V said he was crawled directly by someone in the team. Ask me when to give her a crawl? After many days of nagging, I finally took action. Target Site Analysis First I found a website with popular emoticons. Let's have f ...

I think I'm original Applicable question types and ideasExample: [national training team 2]Tree I thinkingdetails summary Applicable question types and ideas Find the maximum value of the sum of contributions, but it limits that something must be selected exactly k k ...

Source code analysis of Sylar server framework configuration module Overall design of configuration module Basic functions of a configuration module: It supports defining / declaring configuration items, that is, generating an available configuration item when providing configuration name, type and optional default values. Since a c ...

RobotModel and RobotState classes The RobotModel and RobotState classes are the core classes for accessing robot kinematics. The RobotModel class contains the relationships between all links and joints, including the joint limit attributes they load from URDF. The RobotModel also divides the robot's links and joints into plannin ...

Before bloggers special column Ubuntu in is installed on the virtual machine. Here the blogger has integrated a dual system, so we need to reconfigure the Ubuntu environment. Here is a simple record of the process: 1. Prepare the operating system ubuntu-20.04.2.0-desktop-amd64 ISO, USB flash disk startup disk making tool. After starting the ...