FPT Algorithms Exploiting Carving Decomposition for Eulerian Orientations and Ice-Type Models
FPT Algorithms Exploiting Carving Decomposition for Eulerian Orientations and Ice-Type Models
复制标题
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:
影响因子:
--
通讯作者:
H. Imai
中科院分区:
文献类型:
--
作者:
S. Shiroshita;T. Ogasawara;H. Hiraishi;H. Imai
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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期刊:
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