摘要: bzoj2154||洛谷P1829 https://www.lydsy.com/JudgeOnline/problem.php?id=2154 https://www.luogu.org/problemnew/show/P1829 不妨设n<=m 就是求$ans=\sum_{k=1}^m{\frac 阅读全文
posted @ 2018-07-20 15:14 hehe_54321 阅读(203) 评论(0) 推荐(0) 编辑
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