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adding demo of deletion

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Jidong Xiao
2023-11-03 13:57:04 -04:00
parent 18167282fe
commit c64cdd03c6
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hws/08_youtube_comments/README.md
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@@ -167,6 +167,17 @@ Here:
**Definition of deleting a comment**: in this assignment, the definition of "deleting a comment" means delete this current comment, as well as all its descendants. For example, if A is a comment, B is a reply to A, C is a reply to B, D is also a reply to B, E is a reply to D, F is a reply to E, then the operation of "deleting A" means deleting A, B, C, D, E, and F, i.e., deleting A, and all of its descendant.
The following three pictures from youtube demonstrate the visual effect of this delete process.
Before delete, we have four comments: "test", "test2", "test3", "test4". "test" and "test4" are both comments to the video, thus they are siblings, and have no parents."test2" is a reply comment to "test", thus "test2" is the child of "test", and "test" is the parent of "test2". "test3" is a reply comment to "test2", thus "test3" is the child of "test2", and "test2" is the parent of "test3".
![alt text](before_delete.png "before delete")
Now we want to delete "test". Based on our definition of delete, this should cause the deletion of "test", "test2", and "test3".
![alt text](during_delete.png "during delete")
And this is what we get after deletion. As can be seen, "test", "test2", "test3" are all deleted.
![alt text](after_delete.png "after delete")
5. display comment
A line which starts with the string "display_comment" means this line describes the operation of "display a comment". Here is an example: