I regret to say, there exist some indications that Rully Soelaiman (arena) might be a cheater. That would be devastating, because I believed that he was brilliant coder worthy of position next to Oleg and Xilinx, not a cheater.
I have posted 1 problem on spoj, and my friends many more. They all say that Rully posted someone's code. As for my problem this is true, and I disq his solution.
Please look into it. If I am wrong I apologise to all of you, especially to Rully for saying this stuff.