Coloring and Maximum Weight Independent Set of Rectangles

Coloring and Maximum Weight Independent Set of Rectangles
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独立矩形组的着色和最大重量

DOI:
10.1137/1.9781611976465.54
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发表时间:
2020
期刊:
SIAM J. Comput.
影响因子:
--
通讯作者:
Bartosz Walczak
Bartosz Walczak
中科院分区:
--
文献类型:
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作者:
Parinya Chalermsook;Bartosz Walczak

文献摘要

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1960年,Asplund和Grunbaum证明了平面上平行轴矩形的交图都有$O(\omega ^2)$-染色,其中$\omega$是团的最大尺寸。我们提出了第一个渐进的改进,在这个六十岁的界限,证明了每个这样的图是O(\omega\log\omega)$-着色,并提出了一个多项式时间算法,找到这样的着色。这一改进导致了一个多项式时间的$O(\log\log n)$-近似算法的最大重量独立集问题的轴平行矩形,提高了以前的近似比$O(\frac{\log n}{\log\log n})$。
In 1960, Asplund and Grunbaum proved that every intersection graph of axis-parallel rectangles in the plane admits an $O(\omega^2)$-coloring, where $\omega$ is the maximum size of a clique. We present the first asymptotic improvement over this six-decade-old bound, proving that every such graph is $O(\omega\log\omega)$-colorable and presenting a polynomial-time algorithm that finds such a coloring. This improvement leads to a polynomial-time $O(\log\log n)$-approximation algorithm for the maximum weight independent set problem in axis-parallel rectangles, which improves on the previous approximation ratio of $O(\frac{\log n}{\log\log n})$.