Pareto Optimality in House Allocation Problems
Pareto Optimality in House Allocation Problems
复制标题
房屋分配问题中的帕累托最优
DOI:
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发表时间:
2005
期刊:
影响因子:
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通讯作者:
K. Mehlhorn
中科院分区:
文献类型:
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作者:
David J. Abraham;K. Cechlárová;D. Manlove;K. Mehlhorn
We study Pareto optimal matchings in the context of house allocation problems. We present an $O(\sqrt{n}m)$ algorithm, based on Gale's Top Trading Cycles Method, for finding a maximum cardinality Pareto optimal matching, where n is the number of agents and m is the total length of the preference lists. By contrast, we show that the problem of finding a minimum cardinality Pareto optimal matching is NP-hard, though approximable within a factor of 2. We then show that there exist Pareto optimal matchings of all sizes between a minimum and maximum cardinality Pareto optimal matching. Finally, we introduce the concept of a signature, which allows us to give a characterization, checkable in linear time, of instances that admit a unique Pareto optimal matching.