A Tale of Santa Claus, Hypergraphs and Matroids

A Tale of Santa Claus, Hypergraphs and Matroids
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圣诞老人、超图和拟阵的故事

DOI:
10.1137/1.9781611975994.167
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发表时间:
2020
期刊:
Proceedings of the Annual ACMSIAM Symposium on Discrete Algorithms
影响因子:
--
通讯作者:
Zhang, Yihao
Zhang, Yihao
中科院分区:
--
文献类型:
--
作者:
Davies, Sami;Rothvoss, Thomas Rothvoss;Zhang, Yihao

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调度和近似算法中的一个众所周知的问题是圣诞老人问题。假设圣诞老人有一套礼物,他想把它们分配给一组孩子,这样最不快乐的孩子就会尽可能地快乐。这里,孩子对于Presji的值是Formpijϵ{0,pj}。Annamalai等人提出的多项式时间算法。给出了一个12.33-近似,并基于对Haxell的超图匹配论证的一种修正.在这篇文章中,我们引入了圣诞老人问题的变种.我们的算法也是基于Haxell的增广树,但随着拟阵结构的引入,我们用更简洁的方法解决了一个更一般的问题。然后,我们的结果可以作为一个黑盒来获得圣诞老人的(4+ϵ)-近似。这一因素也与圣诞老人的自然、紧凑的LP进行了比较。
A well-known problem in scheduling and approximation algorithms is the Santa Claus problem. Suppose that Santa Claus has a set of gifts, and he wants to distribute them among a set of children so that the least happy child is made as happy as possible. Here, the value that a childihas for a presentjis of the formpijϵ {0,pj}. A polynomial time algorithm by Annamalai et al. gives a 12.33-approximation and is based on a modification of Haxell's hypergraph matching argument.In this paper, we introduce amatroidversion of the Santa Claus problem. Our algorithm is also based on Haxell's augmenting tree, but with the introduction of the matroid structure we solve a more general problem with cleaner methods. Our result can then be used as a blackbox to obtain a (4 +ϵ)-approximation for Santa Claus. This factor also compares against a natural, compact LP for Santa Claus.
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