Shortest code challenge

Question

what will be the shortest code for the factorial

Answer 1

can be it in a single line

Answer 2

f=lambda i:+(i<2) or i*f(i-1)

https://code.sololearn.com/czAFSwbs9SAE/?ref=app

Answer 3

https://code.sololearn.com/cd68VTjfTfkN/?ref=app

Answer 4

Factorial itself can be in one line. I'll post the code when I figure out how to make cin output directly to function parameter without making a variable.

Answer 5

https://code.sololearn.com/c3v4kQUBxGBO/?ref=app

https://code.sololearn.com/c3SyOGlMgthN/?ref=app

I am aware I could stack some lines in main, but it would only hide I couldn't come up with a way to shorten the input. Second one is just with all unnecessary characters removed and one cheeky change to save 1 character.