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arXiv 1508.01014cs.DMcs.CC
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距离边标注的计算复杂性

Computational complexity of distance edge labeling

Dušan Knop, Tomáš Masařík

摘要:

距离边标记问题是距离顶点标记(也称为$L_{2,1}$标记)的一个变体,已经被研究了二十多年,并且具有许多应用,例如频率分配。距离边标记问题询问给定图的边是否可以被标记,使得相邻边的标签至少相差2,并且距离为2的边的标签至少相差1。标签是从$\{0,1,\dots,λ\}$集合中选择的,用于固定$λ$。我们提出了一个完整的分类,其计算复杂性-多项式可解的情况下,其余的情况下,NP-完全的二分法。我们将图与$λ\le 4$,这导致了一个多项式时间算法识别类,我们显示NP-完全性$λ\ge 5$的几个减少单调不全等于3-SAT。

英文摘要:

The problem of Distance Edge Labeling is a variant of Distance Vertex Labeling (also known as $L_{2,1}$ labeling) that has been studied for more than twenty years and has many applications, such as frequency assignment. The Distance Edge Labeling problem asks whether the edges of a given graph can be labeled such that the labels of adjacent edges differ by at least two and the labels of edges of distance two differ by at least one. Labels are chosen from the set $\{0,1,\dots,λ\}$ for $λ$ fixed. We present a full classification of its computational complexity - a dichotomy between the polynomially solvable cases and the remaining cases which are NP-complete. We characterise graphs with $λ\le 4$ which leads to a polynomial-time algorithm recognizing the class and we show NP-completeness for $λ\ge 5$ by several reductions from Monotone Not All Equal 3-SAT.

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