,
J. Ian Munro
,
Yakov Nekrich,
Sebastian Wild
,
Kaiyu Wu
Creative Commons Attribution 3.0 Unported license
We present the first succinct distance oracles for (unweighted) interval graphs and related classes of graphs, using a novel succinct data structure for ordinal trees that supports the mapping between preorder (i.e., depth-first) ranks and level-order (breadth-first) ranks of nodes in constant time. Our distance oracles for interval graphs also support navigation queries - testing adjacency, computing node degrees, neighborhoods, and shortest paths - all in optimal time. Our technique also yields optimal distance oracles for proper interval graphs (unit-interval graphs) and circular-arc graphs. Our tree data structure supports all operations provided by different approaches in previous work, as well as mapping to and from level-order ranks and retrieving the last (first) internal node before (after) a given node in a level-order traversal, all in constant time.
@InProceedings{he_et_al:LIPIcs.ISAAC.2020.25,
author = {He, Meng and Munro, J. Ian and Nekrich, Yakov and Wild, Sebastian and Wu, Kaiyu},
title = {{Distance Oracles for Interval Graphs via Breadth-First Rank/Select in Succinct Trees}},
booktitle = {31st International Symposium on Algorithms and Computation (ISAAC 2020)},
pages = {25:1--25:18},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-173-3},
ISSN = {1868-8969},
year = {2020},
volume = {181},
editor = {Cao, Yixin and Cheng, Siu-Wing and Li, Minming},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ISAAC.2020.25},
URN = {urn:nbn:de:0030-drops-133693},
doi = {10.4230/LIPIcs.ISAAC.2020.25},
annote = {Keywords: succinct data structures, distance oracles, ordinal tree, level order, breadth-first order, interval graphs, proper interval graphs, succinct graph representation}
}