Please go to submission 1771490 and you guys will find something unusual. Is it a bug in Codeforces system?
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I think it's a bug, when system is very busy. Try to resubmit you solution with small change. It dosn't happen at the contest. Don't panic. Sorry for my poor English.
It was not my soln. I was just going through random solutions and found this. So, I thought it to be better to share with others.