Two-Layer Planarization: Improving on Parameterized Algorithmics

Two-Layer Planarization: Improving on Parameterized Algorithmics
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两层平坦化:参数化算法的改进

DOI:
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发表时间:
2005
期刊:
J. Graph Algorithms Appl.
影响因子:
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通讯作者:
H. Fernau
H. Fernau
中科院分区:
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文献类型:
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作者:
H. Fernau

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一个二分图是双平面的,如果顶点可以放在平面中的两条平行线上,使得当边被画成直线段时没有边交叉。我们研究了两个问题:2-Layer Planarization:可以从一个给定的图G中删除k条边,使剩下的图是双平面的吗? 1-层平面化:同样的问题,但一个层上的顶点的顺序是固定的。 改进Dujmovic等人的早期工作。[4],我们解决了$mathcal{O}(k^{2}cdot 5.1926^{k} +| G|)$mathcal{O}(k^{3} cdot 2.5616^{k} +中的$时间和1层平面化问题|G| ^{2})$时间。此外,我们推导出一个小的问题核的1层平面化。
A bipartite graph is biplanar if the vertices can be placed on two parallel lines in the plane such that there are no edge crossings when edges are drawn as straight-line segments. We study two problems:2-Layer Planarization: can k edges be deleted from a given graph G so that the remaining graph is biplanar? 1-Layer Planarization: same question, but the order of the vertices on one layer is fixed. Improving on earlier works of Dujmovic et al. [4], we solve the 2-Layer Planarization problem in $mathcal{O}(k^{2}cdot 5.1926^{k} +|G|)$ time and the 1-Layer Planarization problem in $mathcal{O}(k^{3} cdot 2.5616^{k} + |G|^{2})$ time. Moreover, we derive a small problem kernel for 1-Layer Planarization.