19:30 PM in Moscow is 23:30 in China, so it is hard for people who feel sleepy early (like me) to take part in the contest...

I've noticed that at times there will be contests on 11:30 AM Moscow time , which is a favorable time for me and perhaps more students in China. Hope there could be more early contests so that I can increase(drop) my rating :)

In CodeForces #243 Div 2 B (something to do with mirroring), I submitted a solution (number is 6543367), and on the 10th test it gives 2 with GNU C++ 4.7 compiler, but on my own computer (Windows 8, gdb 6.8) it gives the correct answer 1.

And then I tried to switch to Microsoft VC++ 2010, and got AC.....

I checked my code twice and did not discover any hazard parts. Is there anyone could explain why? Thanks!