FPT Algorithms Exploiting Carving Decomposition for Eulerian Orientations and Ice-Type Models

FPT Algorithms Exploiting Carving Decomposition for Eulerian Orientations and Ice-Type Models
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利用雕刻分解实现欧拉方向和冰型模型的 FPT 算法

DOI:
10.1007/978-3-319-75172-6_19
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发表时间:
2018
期刊:
Lecture Notes in Computer Science (WALCOM 2018)
影响因子:
--
通讯作者:
H. Imai
H. Imai
中科院分区:
--
文献类型:
--
作者:
S. Shiroshita;T. Ogasawara;H. Hiraishi;H. Imai

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无向图的欧拉定向是一种边的定向,使得对于每个顶点,入度和出度都相同。欧拉取向在许多领域都很重要。在统计物理学中,所谓冰模型的配分函数,是冰型模型的特例,与4正则图的欧拉方向数有关,这是它的Tutte多项式在该点的值。4-正则图中欧拉方向数的计算问题是P-完全的,但对于图的树宽却有一个固定参数可处理的FPT(Fixed Parameter Tractable)算法,本文提出了两个基于雕刻分解的FPT算法。其中一个计算一般图的欧拉方向数,另一个计算4-正则图的一般冰型模型的划分函数,其中k为输入图的切割宽度,k为顶点集的大小。
An Eulerian orientation of an undirected graph is an orientation of edges such that, for each vertex, both the indegree and the outdegree are the same. Eulerian orientations are important in a variety of fields. In statistical physics, the partition function of the so-called ice model, which is the special case of the ice-type model, is related to the number of Eulerian orientations of a 4-regular graph, which is the value of its Tutte polynomial at the point. The problem of counting the number of Eulerian orientations in a 4-regular graph is #P-complete, and yet there is an FPT (Fixed Parameter Tractable) algorithm for it with respect to the tree-width of the graph.This paper presents two FPT algorithms based on a carving decomposition. One of them counts the number of Eulerian orientations for a general graph intime andmemory consumption, and the other calculates the partition function of a general ice-type model for a 4-regular graph intime andmemory consumption where, for an input graph,kis the carving-width andnis the size of the vertex set.
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DOI: --
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