Ripatti's blog

By Ripatti, 9 years ago, translation, In English,
Hello everyone!

I am an author of the today problemset. It is my third contest on Codeforces and the first one for div 1.

I thanks Artem Rakhov, Maria Belova, Pavel Kuznetsov and Mike Mirzayanov for help in preparing of this round.

Happy hacking!

Winner is tourist.
Editorial.
Announcement of Codeforces Beta Round #68
Announcement of Codeforces Beta Round #68
 
 
 
 
  • Vote: I like it
  • +183
  • Vote: I do not like it

9 years ago, # |
  Vote: I like it +29 Vote: I do not like it
Nice problems really. Thanks a thousand times :)
9 years ago, # |
  Vote: I like it +1 Vote: I do not like it
1111 users have registered to this contest. We like binary, don't we? :)

By the way, nice problems in this round. I will be waiting for the editorial :)
9 years ago, # |
  Vote: I like it +44 Vote: I do not like it
Very interesting problem.
A funny fact:
In problem A, the example said that tourist win, and it will comes true. :)
9 years ago, # |
  Vote: I like it +8 Vote: I do not like it
I remember a problem similar to the problem E:
I have solved this, the solution is also construction, and the problem in the recent contest seems a sub-problem of this one.
But codeforces contest is just 2-hour, so it's difficult to finish it.
And it's not easy to imagine this stuff and run it in mind.
9 years ago, # |
Rev. 2   Vote: I like it 0 Vote: I do not like it
Apparently I don't get problem C. Why is the answer 4 for a board 4 by 4?

Edit: Ignore that, I just saw the part of the stament I misinterpet. "More formally, first one of four diagonal directions is chosen and the billiard ball moves in that direction. ". Apparently the author meant that just one of the possible four directions is chosen.
9 years ago, # |
  Vote: I like it 0 Vote: I do not like it
I register a contest as a team member (in the All-Ukrainian School Olympiad in Informatics ).
After the contest, I resubmitted the problem and solved it in the PROBLEM SET page.
But, the system deal it as a team, not a person. The problem not turn to green.
I think it is a BUG.