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