Approximating the path-distance-width for AT-free graphs and graphs in related classes

Approximating the path-distance-width for AT-free graphs and graphs in related classes
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近似无 AT 图和相关类中的图的路径距离宽度

DOI:
10.1016/j.dam.2012.11.015
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发表时间:
2013
影响因子:
1.1
通讯作者:
and Koichi Yamazaki
and Koichi Yamazaki
中科院分区:
数学3区
文献类型:
--
作者:
Yota Otachi;Toshiki Saitoh;Katsuhisa Yamanaka;Shuji Kijima;Yoshio Okamoto;Hirotaka Ono;Yushi Uno;and Koichi Yamazaki

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我们考虑的问题,确定的路径距离宽度的AT-自由图和图在相关的类,如k-协可比图,适当的区间图,cobipartite图,和cochain图。我们首先表明,这个问题是NP-困难的,即使是cobipartite图,因此AT-自由图。接下来,我们提出了简单的近似算法与AT-自由图和图在上述相关的图形类的常数近似比。例如,我们的算法AT-自由图的近似因子3和运行在线性时间。我们还表明,这个问题是可解的多项式时间的上链图,形成一个子类的适当的区间图。
We consider the problem of determining the path-distance-width for AT-free graphs and graphs in related classes such as k-cocomparability graphs, proper interval graphs, cobipartite graphs, and cochain graphs. We first show that the problem is NP-hard even for cobipartite graphs, and thus for AT-free graphs. Next we present simple approximation algorithms with constant approximation ratios for AT-free graphs and graphs in the related graph classes mentioned above. For instance, our algorithm for AT-free graphs has approximation factor 3 and runs in linear time. We also show that the problem is solvable in polynomial time for cochain graphs, which form a subclass of the class of proper interval graphs.
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