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摘要: Preface 考场心路历程:第一眼看到题以为是 GOSICK。 结果发现是个全局询问,顿时就没难度了。 Descrpition 给定长度为 \(n\) 的序列 \(a\),求满足 \(a_i = k\times a_j(k\in N_+,i\not = j)\) 的二元组 \((i,j)\) 有多 阅读全文
posted @ 2021-04-15 19:55 feicheng 阅读(29) 评论(0) 推荐(0) 编辑