Explain below output.. i can't understand

Question

https://code.sololearn.com/cG3q31xcvejF/?ref=app

Answer 1

Look:
https://www.sololearn.com/learn/4086/?ref=app
https://www.sololearn.com/learn/4087/?ref=app

Answer 2

bitwise shifts 😳🙃
binary method, I think
go to Google

Answer 3

thanks Stellar Fox for info I understood .