No mail received. I rarely use ideone and keep it on secret if at all and I am always sure to never pass any links of my solutions at least during the contest. Solutions to both the problems had similar style of coding and were 101% written by me, please mail/provide some evidence.
UPD : mail received. So apparently this user ( http://www.codechef.com/users/zackblick1 ) who just made his account for cook off had access to my second solution. I have no idea how :. I think its best I stop using online IDEs.