English

Reconstructing random graphs from distance queries

Combinatorics 2024-07-31 v2

Abstract

We estimate the minimum number of distance queries that is sufficient to reconstruct the binomial random graph G(n,p)G(n,p) with constant diameter with high probability. We get a tight (up to a constant factor) answer for all p>n1+o(1)p>n^{-1+o(1)} outside "threshold windows" around nk/(k+1)+o(1)n^{-k/(k+1)+o(1)}, kZ>0k\in\mathbb{Z}_{>0}: with high probability the query complexity equals Θ(n4dp2d)\Theta(n^{4-d}p^{2-d}), where dd 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(n4dp2dlnn)O(n^{4-d}p^{2-d}\ln n) distance queries with high probability, and this is best possible.

Keywords

Cite

@article{arxiv.2404.18318,
  title  = {Reconstructing random graphs from distance queries},
  author = {Michael Krivelevich and Maksim Zhukovskii},
  journal= {arXiv preprint arXiv:2404.18318},
  year   = {2024}
}
R2 v1 2026-06-28T16:09:08.561Z