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Problem 2407 >> 请求加一组数据
Mr_squre @ 2018-09-07 09:00:34
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2 2
1 2 1 1
1 2 1 1
在黄学长博客下面看到的发现存前驱点的好像都过不去……QwQ
Mr_squre @ 2018-09-07 09:01:35
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答案应该是2……
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