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arXiv 2401.08019cs.DScs.CCmath.OC
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最短路径的中心性:算法与复杂性结果

Centrality of shortest paths: Algorithms and complexity results

The University of Sydney(悉尼大学)

Johnson Phosavanh, Dmytro Matsypura

AI总结:

本文提出了一种多项式算法,用于解决无权网络中最度中心性的最短路径问题,并证明在加权图情况下该问题为NP难。

摘要:

节点的度中心性,定义为相邻节点的数量,常被用作衡量节点对网络结构重要性的指标。本文重新考虑在无权网络中寻找最度中心性的最短路径的问题。我们提出了一种多项式算法,其最坏情况运行时间为O(|E||V|²Δ(G)),其中|V|是网络中的顶点数,|E|是边数,Δ(G)是图的最大度数。我们对合成和实际网络进行了数值研究,并将我们的结果与现有文献进行了比较。此外,我们证明当考虑加权图时,相同的问题是NP难的。此外,我们还考虑了其他中心性度量,如介数和接近度中心性,表明寻找最介数中心性的最短路径问题可以在多项式时间内解决,而寻找最接近度中心性的最短路径问题则是NP难的,无论图是否加权。

英文摘要:

The degree centrality of a node, defined as the number of nodes adjacent to it, is often used as a measure of importance of a node to the structure of a network. This metric can be extended to paths in a network, where the degree centrality of a path is defined as the number of nodes adjacent to it. In this paper, we reconsider the problem of finding the most degree-central shortest path in an unweighted network. We propose a polynomial algorithm with the worst-case running time of $O(|E||V|^2Δ(G))$, where $|V|$ is the number of vertices in the network, $|E|$ is the number of edges in the network, and $Δ(G)$ is the maximum degree of the graph. We conduct a numerical study of our algorithm on synthetic and real-world networks and compare our results to the existing literature. In addition, we show that the same problem is NP-hard when a weighted graph is considered. Furthermore, we consider other centrality measures, such as the betweenness and closeness centrality, showing that the problem of finding the most betweenness-central shortest path is solvable in polynomial time and finding the most closeness-central shortest path is NP-hard, regardless of whether the graph is weighted or not.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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