Hello ! I am an IOI 2016 contestant and thinking about my experience from the last year IOI I had two major problems with the contest environment making me loose lot's of precious time :

1) testing my solution with the grader provided was really unfamiliar for me
2) problems do not require I/O routine but instead coding a function that takes input as parameter

(and such difficulties was enhanced by contest stress )

I know such technicalities may be trivial for a veteran contestant but I really don't to see my effort lost because of that , so it will be nice if someone provides some help :D

thanks !