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-0算不算valid?In Reply To:F我考虑了超过10^15,多余符号,和为零,不为一行,个数不足和超过N,然后树的数目不唯一或者更优,然后就AC了,结果由于犯低级错误白罚了60MIN Posted by:LIANGLIANG at 2005-11-13 15:42:26 Followed by:
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