In Codeforces Round #304 , there is a bug occurred during the contest.

When i was hacking i found someone had wrong solution in problem B so i tried to hack him with this test case:
3
1 1 1
and then it was showing "invalid input"
then i tried again with different cases (similar idea) and keep telling me "invalid input"

Then later on i found someone hacking him/her with the same test case and it showed "Successful hacking attempt" ?!

My hacking attempt was with id 153991 at 2015-05-22 21:08:51 on eknoor292 solution
swust_20131737 hacking attempt with id 154761 at 2015-05-22 21:28:05 with the same test case on the same person

I don't care about this contest but i am afraid that it may happen again so please someone from technical team respond to it
This bug caused me to stop hacking attempts as i thought i misunderstood the problem and consumed me time also by reading the problem many times

Thank you very much for the attention :D

UPD: maybe because i didn't print \n character as explained in comments :D