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arXiv 2507.04485cs.GT
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常数近似且常数策略-proof的双设施选址

Constant-Approximate and Constant-Strategyproof Two-Facility Location

Elijah Journey Fullerton, Zeyuan Hu, C. Gregory Plaxton

AI总结:

针对双设施选址问题,通过放宽策略-proof性和允许设施位于平面,提出常数近似且常数策略-proof的机制,并进一步实现Lipschitz连续版本。

摘要:

我们研究双设施选址问题的确定性机制。给定n个代理在实线上的报告位置,这样的机制指定了两个设施的建造位置。该问题的单设施变体允许一个简单的策略-proof机制来最小化社会成本。然而,对于双设施,已知任何策略-proof机制都是Ω(n)近似的。我们试图通过放宽问题要求来规避这个强下界。遵循设施选址文献中的其他工作,我们考虑一种放宽形式的策略-proof性,即没有代理可以通过撒谎来改善其结果超过一个常数因子。因为上述Ω(n)下界容易推广到常数策略-proof机制,我们引入了第二个放宽:允许设施(而非代理)位于平面上。我们的第一个主要结果是针对这种放宽的一个自然机制,它是常数近似且常数策略-proof的。该机制的一个特点是输入配置的微小变化可能导致解决方案的巨大变化。受此观察以及设施重新分配文献中的结果的启发,我们的第二个主要结果是一个常数近似、常数策略-proof且Lipschitz连续的机制。

英文摘要:

We study deterministic mechanisms for the two-facility location problem. Given the reported locations of n agents on the real line, such a mechanism specifies where to build the two facilities. The single-facility variant of this problem admits a simple strategyproof mechanism that minimizes social cost. For two facilities, however, it is known that any strategyproof mechanism is $Ω(n)$-approximate. We seek to circumvent this strong lower bound by relaxing the problem requirements. Following other work in the facility location literature, we consider a relaxed form of strategyproofness in which no agent can lie and improve their outcome by more than a constant factor. Because the aforementioned $Ω(n)$ lower bound generalizes easily to constant-strategyproof mechanisms, we introduce a second relaxation: Allowing the facilities (but not the agents) to be located in the plane. Our first main result is a natural mechanism for this relaxation that is constant-approximate and constant-strategyproof. A characteristic of this mechanism is that a small change in the input profile can produce a large change in the solution. Motivated by this observation, and also by results in the facility reallocation literature, our second main result is a constant-approximate, constant-strategyproof, and Lipschitz continuous mechanism.

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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