Bits and sizeof structure

Question

I got something similar in the challenges. Could you please explain me how it works and why is the output as it is?
Thanks
https://code.sololearn.com/cUt1P0Z08Hxn/?ref=app

Answer 1

There are a series of posts of structure packing from C++ Soldier (Babak) user that explains this
https://www.sololearn.com/post/78037/?ref=app