3 Questions(medium, medium, hard)

Looks like sharechat's hiring process is screwed up, solved 3 still got rejection mails.
The problems were also like picked randomly without considering that it is OA.

If rejection was the ultimate goal of the OA, they could have not sent the test link at the first place. Like they wanted to show that they are hiring actively.

Never to apply for such ponzi startups in future at the first place.