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arXiv cs/0502041cs.DScs.CC
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细胞探针模型的对数下限

Logarithmic Lower Bounds in the Cell-Probe Model

Mihai Patrascu, Erik D. Demaine

摘要:

我们开发了一种新的技术,用于证明动态数据结构上的细胞探测下界。这种技术使我们能够证明一个摊销的随机欧米茄(lg n)的下限每个操作的几个数据结构问题的n个元素,包括部分和,不相交的路径(或森林或图形)之间的动态连接,和其他几个动态图形问题(通过简单的减少)。这样的下限打破了长期存在的障碍欧米茄(lg n / lglg n)的任何动态语言成员资格的问题。它还建立了几个现有的数据结构,如Sleator和Tarjan的动态树的最优性。我们还证明了第一个欧米茄(log_B n)下界的外部存储器模型没有假设的数据结构(如比较模型)。我们的下限也给出了匹配的查询更新权衡曲线,例如,通过几种数据结构来实现图中的动态连接。我们还证明了匹配的上界和下界的部分和参数化时的字的大小和最大的添加剂的变化在更新。

英文摘要:

We develop a new technique for proving cell-probe lower bounds on dynamic data structures. This technique enables us to prove an amortized randomized Omega(lg n) lower bound per operation for several data structural problems on n elements, including partial sums, dynamic connectivity among disjoint paths (or a forest or a graph), and several other dynamic graph problems (by simple reductions). Such a lower bound breaks a long-standing barrier of Omega(lg n / lglg n) for any dynamic language membership problem. It also establishes the optimality of several existing data structures, such as Sleator and Tarjan's dynamic trees. We also prove the first Omega(log_B n) lower bound in the external-memory model without assumptions on the data structure (such as the comparison model). Our lower bounds also give a query-update trade-off curve matched, e.g., by several data structures for dynamic connectivity in graphs. We also prove matching upper and lower bounds for partial sums when parameterized by the word size and the maximum additive change in an update.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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