Programmer Group

1, Foreword The sequential storage structure of linear table (such as array) has continuous storage space, so we don't have to worry about the logical relationship between elements. The biggest advantage of linear table is that it can quickly access the elements at any position in the table. The disadvantage of linear table sequential storage ...

2021SC@SDUSC visual_ feature_ img_ Analysis of callback In the previous blog, we analyzed one of the callback functions lidar in LVI-SAM_ callback. Through the last blog, we know lidar_callback subscribes to the lidar message and obtains the read-up information through processing, and then puts the dot graph with depth information into the s ...

In "Canvas is everything (1) - Introduction to the basics", we introduce the basic mode of UI programming using canvas and use the basic mode to analyze how to achieve the function of mouse hovering over elements and element discoloration. In this article, we still use the basic mode of canvas programming to program, but this time we ...

From common String commands to actual application scenario requirements design and development, this chapter enables you who are unfamiliar with redis to quickly master and understand, and you who are familiar with redis to quickly consolidate relevant knowledge 1, Characteristic description (1) String is the most basic type of Redis. A key c ...

java_ Command execution Runtime class analysis First look at the demo of a command execution, as follows import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; public class RuntimeTest { public static void main(String[] args) throws IOException { Runtime runtime = Runtime.getRuntime(); ...

Let's first determine the most basic functions of the container. First, the container needs to be able to store and extract objects.The objects in the container can be managed uniformly in an array. The class name can be used as the key, the object as the value, and the object can be stored in the array.When extracting an object, you only need ...

summary Each fluent project contains a pubspec.yaml file, commonly known as pubspec. When creating a new fluent project, this file will be generated in the project root directory to specify the dependencies required by the project, such as a specific package (and its version), font or image file. It also specifies other requirements, such as d ...

1, Study notes 1.TCP/IP protocol        TCP/IP protocol: TCP stands for transmission control protocol. IP stands for internet protocol. At present, there are two versions of IP, namely IPv4 and IPv6. IPv4 uses 32-bit address and IPv6 uses 128 bit address. The TCP/IP layers and protocols used are shown in the figure ...

Maximum depth of binary tree Given a binary tree, find its maximum depth. The depth of the binary tree is the number of nodes on the longest path from the root node to the farthest leaf node. explain:   A leaf node is a node that has no children. Example: Given binary tree [3,9,20,null,null,15,7],     3    / \   9  20     /  \    15 ...

To say which community is strong, we have to Tencent cloud MVP - > cloud + community!!!It's not expensive~~~Just 198, not 699! You earn as soon as you buy it. It doesn't matter if you don't buy it. The invitation is also polite!!!(when I first came to the precious land, those who have money hold a money market and those who have no money hol ...