Snap interview questions

Call with recruiter, then had a call with the hiring manager, then did a "panel" of virtual interviews with four different team members, and finally got a generic rejection email from the recruiter.

There were 4 tech interviews with 4 different persons by skype. Mostly about C++ and algorithms, every time was live coding with screen sharing. Didn't give any feedback except "we couldn't your give offer", i.e. don't understand any details about weakness.