I keep getting Wrong Answer at this problem, and I have no idea why. I've even found the page of the original contest where this problem has been used, but their output is exactly the same as mine:

http://tud-pc.informatik.tu-darmstadt.de/2003/

So, why Wrong Answer? Could someone show me some tricky testcases? Or could someone at Peking Online-Judge check the testcases?

Thanks.