I'm preparing for our university's programing contest on Codeforces.
I've created a mashup contest and add it to our group.
But it seems that the contest's registration and start are in same day!
How can I edit the registration begin time a week earlier so that I could invite the perticipants just through share them the contest's url and let them regist the contest themselves?
It's important for me. :-(
Also I want to know how to remove a problem from a mashup contest after add it through polygon id.