Inserting Multiple Edges into a Planar Graph

Inserting Multiple Edges into a Planar Graph
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将多条边插入平面图

DOI:
10.4230/lipics.socg.2016.30
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发表时间:
2015
期刊:
ArXiv
影响因子:
--
通讯作者:
Petr Hliněný
Petr Hliněný
中科院分区:
--
文献类型:
--
作者:
Markus Chimani;Petr Hliněný

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设$G$是一个连通的平面图(但还没有嵌入),$F$是一组还没有在$G$中的附加边。多重边插入问题(MEI)要求$G+F$的一个图具有最少的成对边交叉数,使得$G$的子图是平面的。这个问题的最优解近似于图$G+F$的交叉数。 对于一般的F$,求MEI的精确解是NP困难的,但对于特殊的F $,则是线性时间可解的|F| =1$(SODA 01,migica)或当所有$F$都关联到新顶点(SODA 09)时。 一般的$F$的复杂性,但具有常数$k=| F| $是开放的,但是已经提出了具有相对和绝对近似保证的算法(SODA 11,ICALP 11)。我们表明,问题是固定参数易处理(FPT)在$k$的双连通的$G$,或如果$G$的割顶点有一定程度的常数有界。我们给出了这个问题的第一个精确算法;它只需要O(|V(G)|)$时间对于任何常数$k$。
Let $G$ be a connected planar (but not yet embedded) graph and $F$ a set of additional edges not yet in $G$. The {multiple edge insertion} problem (MEI) asks for a drawing of $G+F$ with the minimum number of pairwise edge crossings, such that the subdrawing of $G$ is plane. An optimal solution to this problem approximates the crossing number of the graph $G+F$. Finding an exact solution to MEI is NP-hard for general $F$, but linear time solvable for the special case of $|F|=1$ (SODA01, Algorithmica) or when all of $F$ are incident to a new vertex (SODA09). The complexity for general $F$ but with constant $k=|F|$ was open, but algorithms both with relative and absolute approximation guarantees have been presented (SODA11, ICALP11). We show that the problem is fixed parameter tractable (FPT) in $k$ for biconnected $G$, or if the cut vertices of $G$ have degrees bounded by a constant. We give the first exact algorithm for this problem; it requires only $O(|V(G)|)$ time for any constant $k$.
交叉数的更紧密的基于插入的近似
DOI: 10.1007/s10878-016-0030-z
发表时间: 2017
影响因子: 1
作者:
M. Chimani;P. Hlinĕný
通讯作者: P. Hlinĕný
DOI: 10.1016/j.ejc.2011.09.009
发表时间: 2012
期刊: Eur. J. Comb.
影响因子: --
作者:
Markus Chimani;Petr Hliněný;Petra Mutzel
通讯作者: Petra Mutzel