I'm so silly ... I found all of this problems, but I think that on page acm.uva.es/archive message which talk about clicking region should be in lighter colour (I miss them when I look at this page first time ...)
TO JUDGE'S ADMINISTRATOR:
Maybe it's time to create forum(s) on this board for discussion about problems contained at acm.uva.es/archive ? I want to discuss about a few problems, but I don't know where ... I can post in "Other words", but I think that'll be great, when we could have forum for it :)
Best regards
DM
If you really want to get Accepted, try to think about possible, and after that - about impossible ... and you'll get, what you want ....
Born from ashes - restarting counter of problems (800+ solved problems)
:)