Can anyone give me a hint for this problem ? I haven't found editorial on codeforces.
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Sorry for my poor english.
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This might be useful (translated from some Japanese forum)
https://translate.google.com/translate?hl=en&sl=auto&tl=en&u=http%3A%2F%2Fkmjp.hatenablog.jp%2Fentry%2F2014%2F03%2F21%2F1000