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Fixed-parameter algorithms for the weighted Max-Cut problem on embedded 1-planar graphs
Theoretical Computer Science ( IF 0.9 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.tcs.2020.11.030
Christine Dahn , Nils M. Kriege , Petra Mutzel , Julian Schilling

We propose two fixed-parameter tractable algorithms for the weighted Max-Cut problem on embedded 1-planar graphs parameterized by the crossing number k of the given embedding. A graph is called 1-planar if it can be drawn in the plane with at most one crossing per edge. Our algorithms recursively reduce a 1-planar graph to at most 3k planar graphs, using edge removal and node contraction. Our main algorithm then solves the Max-Cut problem for the planar graphs using the FCE-MaxCut introduced by Liers and Pardella [23]. In the case of non-negative edge weights, we suggest a variant that allows to solve the planar instances with any planar Max-Cut algorithm. We show that a maximum cut in the given 1-planar graph can be derived from the solutions for the planar graphs. Our algorithms compute a maximum cut in an embedded weighted 1-planar graph with n nodes and k edge crossings in time O(3kn3/2logn).



中文翻译:

嵌入式一平面图上加权Max-Cut问题的固定参数算法

针对由给定嵌入的交叉数k参数化的嵌入式1-平面图的加权Max-Cut问题,我们提出了两种固定参数易处理算法。如果可以在平面中以每条边最多一个交叉的方式绘制图形,则将其称为1-平面。我们的算法将1平面图递归减少到最大3ķ平面图,使用边缘去除和节点收缩。然后,我们的主要算法使用Liers和Pardella [23]引入的FCE-MaxCut解决平面图的Max-Cut问题。在非负边缘权重的情况下,我们建议使用一种变体,该变体允许使用任何平面Max-Cut算法求解平面实例。我们表明,可以从平面图的解中得出给定的1平面图的最大割宽。我们的算法在n个节点和k个边缘交叉点的时间的嵌入式加权1平面图中计算最大割点Ø3ķñ3/2日志ñ

更新日期:2020-12-13
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