LeetCode 207. Curriculum | Python

207. Curriculum Title Source: LeetCode https://leetcode-cn.com/problems/course-schedule subject You must take numCourse courses this semester, marked as 0 to numCourse-1. Some prerequisite courses are required before taking some courses. For example, to learn course 0, you need to complete course 1 first. We use a match to represent them: [0, ...

Posted by groovey on Wed, 25 May 2022 15:01:55 +0300

Node.js Stream - Actual Combat

The first two ( Basics and Advanced ) mainly introduces the basic usage and principles of streams. From the perspective of application, this article introduces how to use pipelines for programming. The main contents include: pipe concept Browserify's pipeline design Gulp's Pipeline Design Comparison of Two Pipeline Design Patterns e ...

Posted by mbdonner on Wed, 25 May 2022 14:08:44 +0300

"One stop" is compatible with the Spring Boot implementation of file storage for all cloud vendors

background Today, with the development of the Internet, almost all cloud manufacturers provide object storage services. A massive, safe, low-cost and highly reliable cloud storage service, which is suitable for storing any type of files. Flexible expansion of capacity and processing capacity, multiple storage types to choose from, and comprehen ...

Posted by Stagnate on Wed, 25 May 2022 14:06:05 +0300

Database: mysql:undo log

1, Definition Files required for transaction rollback. 2, Function Rollback the transaction MVCC control: when a user reads a row of record, if the record has been occupied by other transactions, the current transaction can read the previous row version information through undo log, so as to realize consistent non locking reading. The snapsho ...

Posted by itsjareds on Wed, 25 May 2022 13:51:44 +0300

Dynamically add a row, delete a row, and clear all rows in el-table in ElementUI

Scenes The effect is as follows   Note: Blog:https://blog.csdn.net/badao_liumang_qizhi Pay attention to the public account domineering programmer Get programming-related eBooks, tutorial pushes, and free downloads. accomplish First add an el-table to the page, and then bind its data source to bcglXiangXiList, and through <el-table ...

Posted by timmy0320 on Wed, 25 May 2022 13:47:05 +0300

2020 Niuke summer multi school training camp (the eighth)

Title number A B C D E F G H I J K In the game 💭 🎈 🎈 After the game ✅ ✅ ✅ A - Social Distancing meaning of the title thinking code B - Mask Allocation meaning of the title Pack \ (n\times m \) masks into several copies. It is required that after packing, they can be divided equally whether they are distributed to ...

Posted by raker7 on Wed, 25 May 2022 13:37:54 +0300

Detailed explanation of Scrapy crawler framework (project actual combat)

Official documents: https://scrapy.org/ 1, Introduction to the Scrapy framework Writing a reptile requires a lot of work. For example: sending network request, data analysis, data storage, anti crawler mechanism (changing ip proxy, setting request header, etc.), asynchronous request, etc. It's a waste of time if you have to write these jobs fro ...

Posted by justice1 on Wed, 25 May 2022 13:30:41 +0300

Heap and heap sorting

Heap and heap sorting Definition of heap The heap is a complete binary tree: except for the last layer, the other layers must be full at several points, and the nodes of the last layer must be filled gradually from left to right The value of each parent node in the heap must be greater than or equal to (or less than or equal to) the value of ...

Posted by activeradio on Wed, 25 May 2022 13:10:30 +0300

Debugging Tools: Application Validator (How to use it and how it works)

What does Application Verifier do? Application Verifier is an official application verification tool from Microsoft. It is mainly used to help users detect and debug memory corruption, dangerous security vulnerabilities, Run-time detection, etc. It is an auxiliary development tool without modifying the source code; When reporting unrel ...

Posted by Idri on Wed, 25 May 2022 12:51:24 +0300

plsql, cursor, stored procedure

The following are personal study notes The plsql language is case insensitive. 1. Program structure: Plsql is divided into three parts: declaration part, executable part and exception handling part. Syntax: declare --Declaring variables, cursors i integer; begin --Execute statement --exception handling end; Example: print hello world ...

Posted by bnmng on Wed, 25 May 2022 12:34:32 +0300