论文标题
关于几乎稳定婚姻的(参数化)复杂性
On the (Parameterized) Complexity of Almost Stable Marriage
论文作者
论文摘要
在稳定的婚姻问题中。当偏好列表完成后,较小侧的所有代理都可以匹配。但是,当优先列表不完整时,这不必是真的。在大多数现实生活中,代理商自愿参加匹配市场并提交他们的偏好,自然而然地假设每个代理商都希望与他/她的偏好名单中的某人匹配,而不是无与伦比。鉴于乡村医院定理,我们必须放松稳定比赛的“无阻塞对”条件,以匹配更多的代理。在本文中,我们研究了匹配更多可能阻塞边缘的代理的问题。特别是,我们找到了一个匹配,其大小超过图表中稳定匹配的大小至少t,并且最多具有k阻塞边缘。我们在几个自然参数K,T,D的范围内研究了这个问题,其中D是首选项列表的最大长度。不幸的是,即使对于组合参数k+t+d,问题仍然很棘手。因此,我们将研究扩展到了此问题的本地搜索变体,在该版本中,我们搜索了一个不仅满足上述条件的匹配,而且就其与给定稳定匹配的对称差异而言是“最接近的”,并获得了FPT算法。
In the Stable Marriage problem. when the preference lists are complete, all agents of the smaller side can be matched. However, this need not be true when preference lists are incomplete. In most real-life situations, where agents participate in the matching market voluntarily and submit their preferences, it is natural to assume that each agent wants to be matched to someone in his/her preference list as opposed to being unmatched. In light of the Rural Hospital Theorem, we have to relax the "no blocking pair" condition for stable matchings in order to match more agents. In this paper, we study the question of matching more agents with fewest possible blocking edges. In particular, we find a matching whose size exceeds that of stable matching in the graph by at least t and has at most k blocking edges. We study this question in the realm of parameterized complexity with respect to several natural parameters, k,t,d, where d is the maximum length of a preference list. Unfortunately, the problem remains intractable even for the combined parameter k+t+d. Thus, we extend our study to the local search variant of this problem, in which we search for a matching that not only fulfills each of the above conditions but is "closest", in terms of its symmetric difference to the given stable matching, and obtain an FPT algorithm.