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arXiv 1704.07546cs.DS
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热门搭配较低的quantum

Popular Matching with Lower Quotas

Meghana Nasre, Prajakta Nimbhorkar

摘要:

我们认为,充分研究的住院医师(HR)的问题,在存在较低的配额(LQ)。输入实例由二分图$G = (\mathcal{R} \cup \mathcal{H}, E)$组成,其中$\mathcal{R}$和$\mathcal{H}$分别表示居民和医院的集合。每个顶点都有一个偏好列表,对它的邻居施加严格的排序。此外,每个医院的$h$都有一个相关的上限$q^+(h)$和下限$q^-(h)$。$G$中匹配的$M$是指将住院医师分配到医院,如果每个住院医师最多分配到一家医院,并且医院$h$至少分配到$q^-(h)$,最多分配到$q^+(h)$住院医师,则称$M$可行。稳定性是模型中两组顶点都有偏好的事实上的最优性概念。一个匹配是稳定的,如果没有未分配的对有动机偏离它。众所周知,HRLQ问题的一个实例不需要承认一个可行的稳定匹配。在本文中,我们考虑HRLQ问题的流行度的概念。当顶点在$M$和$M'$之间投票时,如果没有其他匹配的$M'$获得比$M$更多的选票,则匹配的$M$是流行的。当没有更低的配额时,总是存在稳定匹配,并且已知每个稳定匹配都是受欢迎的。我们表明,在一个HRLQ的情况下,虽然一个可行的稳定匹配不需要存在,总是有一个匹配,是流行的可行匹配。我们给出了一个有效的算法来计算一个最大的基数匹配,这是流行的所有可行的匹配在一个HRLQ实例。

英文摘要:

We consider the well-studied Hospital Residents (HR) problem in the presence of lower quotas (LQ). The input instance consists of a bipartite graph $G = (\mathcal{R} \cup \mathcal{H}, E)$ where $\mathcal{R}$ and $\mathcal{H}$ denote sets of residents and hospitals respectively. Every vertex has a preference list that imposes a strict ordering on its neighbors. In addition, each hospital $h$ has an associated upper-quota $q^+(h)$ and lower-quota $q^-(h)$. A matching $M$ in $G$ is an assignment of residents to hospitals, and $M$ is said to be feasible if every resident is assigned to at most one hospital and a hospital $h$ is assigned at least $q^-(h)$ and at most $q^+(h)$ residents. Stability is a de-facto notion of optimality in a model where both sets of vertices have preferences. A matching is stable if no unassigned pair has an incentive to deviate from it. It is well-known that an instance of the HRLQ problem need not admit a feasible stable matching. In this paper, we consider the notion of popularity for the HRLQ problem. A matching $M$ is popular if no other matching $M'$ gets more votes than $M$ when vertices vote between $M$ and $M'$. When there are no lower quotas, there always exists a stable matching and it is known that every stable matching is popular. We show that in an HRLQ instance, although a feasible stable matching need not exist, there is always a matching that is popular in the set of feasible matchings. We give an efficient algorithm to compute a maximum cardinality matching that is popular amongst all the feasible matchings in an HRLQ instance.

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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