,
Maksim Zhukovskii
Creative Commons Attribution 4.0 International license
We estimate the minimum number of distance queries that is sufficient to reconstruct the binomial random graph G(n,p) with constant diameter with high probability. We get a tight (up to a constant factor) answer for all p > n^{-1+o(1)} outside "threshold windows" around n^{-k/(k+1)+o(1)}, k ∈ ℤ_{> 0}: with high probability the query complexity equals Θ(n^{4-d}p^{2-d}), where d is the diameter of the random graph. This demonstrates the following non-monotone behaviour: the query complexity jumps down at moments when the diameter gets larger; yet, between these moments the query complexity grows. We also show that there exists a non-adaptive algorithm that reconstructs the random graph with O(n^{4-d}p^{2-d}ln n) distance queries with high probability, and this is best possible.
@InProceedings{krivelevich_et_al:LIPIcs.ESA.2025.30,
author = {Krivelevich, Michael and Zhukovskii, Maksim},
title = {{Reconstructing Random Graphs from Distance Queries}},
booktitle = {33rd Annual European Symposium on Algorithms (ESA 2025)},
pages = {30:1--30:17},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-395-9},
ISSN = {1868-8969},
year = {2025},
volume = {351},
editor = {Benoit, Anne and Kaplan, Haim and Wild, Sebastian and Herman, Grzegorz},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ESA.2025.30},
URN = {urn:nbn:de:0030-drops-244982},
doi = {10.4230/LIPIcs.ESA.2025.30},
annote = {Keywords: random graphs, graph reconstruction, distance queries, query complexity}
}