For loops help

Question

Someone knows for what reason that code don't work?
https://code.sololearn.com/WlTIZqMsmRhO/?ref=app

Answer 1

I think u must write d - - or d=d-1 in place of d-1
//tag is java , so i comed here

Answer 2

why do you use loop here?

Answer 3

Work, thanks. I'm using to writte a other code.
https://code.sololearn.com/We0u0OWKEs9T/?ref=app

Answer 4

great