ER diagram Notation:

1. Chen Notation

2. Crow’s Foot Notation

3. UML Class Diagram Notation

Example MD

Problem Description

Fors some unknow reason, the user is unable to click the text boxes or type anything into the publish window after running the Build & Publish. When the user clicks the main window in Unity, the cursor disappears and the user can not select the text boxes or anything else.

This problem happens under my settings, macOS Catalina 10.15.7, Unity 2019.4.31f1, VRChat SDK3.

Solution

The reason of this problem is that when you click the temp scene created by the SDK3, the cursor will be invisible and locked.

1. Avticate your environment，check for package ipykernel

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python -m ipykernel --version

If it’s not installed：

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python -m pip install ipykernel

2. Add kernel to Jupyter notebook

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python -m ipykernel install --user --name 'kernelname'

3. Check Jupyter notebook kernel

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jupyter kernelspec list

4. Delet jupyter kernel

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jupyter kernelspec remove kernelname

Update 2022.09.25:

If you encounter the error: ImportError: cannot import name ‘AsyncGenerator’

Given a string s, find the length of the longest substring without repeating characters.

Example 1:

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Input: s = "abcabcbb"
Output: 3
Explanation: The answer is "abc", with the length of 3.

Example 2:

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Input: s = "bbbbb"
Output: 1
Explanation: The answer is "b", with the length of 1.

Example 3:

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Input: s = "pwwkew"
Output: 3
Explanation: The answer is "wke", with the length of 3.
Notice that the answer must be a substring, "pwke" is a subsequence and not a substring.

Example 4:

Q. What are genetic algorithm and evolutionary algorithm?

Genetic algorithm (GA) is a sub-class of evolutionary algorithm (EA).

There are 3 implementation of EAs: GA, evolution strategies (ES), and evolutionary programming (EP). Among these, GAs have proved to be the most popular of the 3 EAs. These algorithms are similar in general, yet there are big differences among them:

GA: They were developed by Holland and thoroughly reviewed by Goldberg;