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arXiv · 1707.08807

Nearest Common Ancestors: Universal Trees and Improved Labeling Schemes

Fabian Kuhn·Konstantinos Panagiotou·Pascal Su
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Abstract

We investigate the nearest common ancestor (NCA) function in rooted trees. As the main conceptual contribution, the paper introduces universal trees for the NCA function: For a given family of rooted trees, an NCA-universal tree $S$ is a rooted tree such that any tree $T$ of the family can be embedded into $S$ such that the embedding of the NCA in $T$ of two nodes of $T$ is equal to the NCA in $S$ of the embeddings of the two nodes. As the main technical result we give explicit constructions of NCA-universal trees of size $n^{2.318}$ for the family of rooted $n$-vertex trees and of size $n^{1.894}$ for the family of rooted binary $n$-vertex trees. A direct consequence is the explicit construction of NCA-labeling schemes with labels of size $2.318\log_2 n$ and $1.894\log_2 n$ for the two families of rooted trees. This improves on the best known such labeling schemes established by Alstrup, Halvorsen and Larsen [SODA 2014].

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Fabian Kuhn, Konstantinos Panagiotou, Pascal Su. 2017-07-27. Nearest Common Ancestors: Universal Trees and Improved Labeling Schemes. https://arxiv.org/abs/1707.08807

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