摘要：
The Company Dynamic Rankings has developed a new kind of computer that is no longer satisfied with the query like to simply find the k-th smallest num 阅读全文
摘要：
描述 大家对斐波那契数列想必都很熟悉: a0 = 1, a1 = 1, ai = ai-1 + ai-2,(i > 1)。 现在考虑如下生成的斐波那契数列: a0 = 1, ai = aj + ak, i > 0, j, k从[0, i-1]的整数中随机选出（j和k独立）。 现在给定n，要求求出E( 阅读全文