Can anyone give me some hints for this problem?
http://lightoj.com/volume_showproblem.php?problem=1127
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I think it is a bad habit to simply ask "Can somebody give me solution to this xy?"
You obviously haven't even bothered to formulate a specific question, or to explain in any way what is actually unclear. Or that you might come up with a more meaningful topic than "need help".
But expect a nice explanation. In addition, the link is broken.