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arXiv · 2611.00388

Online carpooling against an oblivious adversary

Yuhao Lei
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Abstract

In the online carpooling problem, edges on $n$ vertices arrive one at a time and must be oriented immediately, so as to keep the difference between the indegree and the outdegree of every vertex small. We give a randomized online algorithm which bounds the largest absolute difference over the first $T$ edges by $O((\log T)^{1/3})$ with high probability on every input sequence fixed in advance. This proves a conjecture of Kulkarni, Reis and Rothvoss and matches the known worst case lower bound. The algorithm keeps the law of the discrepancy vector dominated in the convex order by a Gaussian measure, and forces the endpoint with the smaller discrepancy to receive the edge whenever the two discrepancies are far apart. In the analysis we show that a vertex of discrepancy $D$ is preceded by a set of $O(D)$ vertices with total discrepancy $Ω(D^2)$.

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BibTeXRIS

Yuhao Lei. 2026-10-30. Online carpooling against an oblivious adversary. https://arxiv.org/abs/2611.00388

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