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arXiv 0710.0083cs.DS
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随机费用的排序和选择

Sorting and Selection with Random Costs

Stanislav Angelov, Keshav Kunal, Andrew McGregor

摘要:

除了单位成本比较模型之外,还有越来越多的关于模型分类和选择的工作。这项工作是第一次治疗的自然随机变量的问题,比较两个元素的成本是一个随机变量。每个成本都是独立选择的,并且是算法已知的。特别地,我们考虑以下三个模型:每个成本在范围$[0,1]$中均匀选择,每个成本以一定概率$p$为0,否则为1,或者每个成本以概率$p$为1,否则为无穷大。我们提出了这些问题的下限和上限(在大多数情况下是最优的)。我们通过仔细设计算法来获得我们的上界,以确保在各个阶段产生的成本是独立的,并在适当的时候使用随机偏序的属性。

英文摘要:

There is a growing body of work on sorting and selection in models other than the unit-cost comparison model. This work is the first treatment of a natural stochastic variant of the problem where the cost of comparing two elements is a random variable. Each cost is chosen independently and is known to the algorithm. In particular we consider the following three models: each cost is chosen uniformly in the range $[0,1]$, each cost is 0 with some probability $p$ and 1 otherwise, or each cost is 1 with probability $p$ and infinite otherwise. We present lower and upper bounds (optimal in most cases) for these problems. We obtain our upper bounds by carefully designing algorithms to ensure that the costs incurred at various stages are independent and using properties of random partial orders when appropriate.

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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