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I think a backtrack would work on this problem.

Thanks , Slash.

i was in level 5 and i solve 3 problems and the other problem got wrong answer , and i had access to level 6 problems.

PD:Thanks COJ for this great CONTEST!!

http://coj.uci.cu/24h/problem.xhtml?abb=1470

I have problem to understand the following output :

input:
3
XXX
XXX
XXX

output:
5

Someone could explain me why 5 octaves?

Thanks , by the way , im using BufferedReader , i will try with Scanner later.

http://coj.uci.cu/contest/contestview.xhtml?cid=1127

What happen with problem named AVERAGE , i got RuntimeError in Java , please help me someone.