Question creation principle

[Kasania]

Questions have to design for using git and github.
All members of our study group should be able to use git and github. Therefore, all problems must be designed so that they can be solved and submitted only by using git and github.

Questions on a subject should be able to cover most of the subject.
If not, the test may be less accurate.

Each question should only cover one subject.
Not only is the difficulty of the question too hard, it also requires adding, modifying, or removing too much code at once.

Each question should be designed to create a single commit.
If a question leads to making multiple commits, or If questions leads to making a single commit, then scoring can be very difficult. And also it does not fit the original purpose.

[Kasania]

Do not close this issue.
This issue will close when finish the test.