The temporal explorer who returns to the base

Akrida, Eleni C, Mertzios, George B, Spirakis, Paul G ORCID: 0000-0001-5396-3749 and Raptopoulos, Christoforos
(2021) The temporal explorer who returns to the base. JOURNAL OF COMPUTER AND SYSTEM SCIENCES, 120. pp. 179-193.

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We study here the problem of exploring a temporal graph when the underlying graph is a star. The aim of the exploration problem in a temporal star is finding a temporal walk which starts and finishes at the center of the star, and visits all leaves. We present a systematic study of the computational complexity of this problem, depending on the number k of time points where each edge can be present in the graph. We distinguish between the decision version STAREXP(k), asking whether a complete exploration exists, and the maximization version MAXSTAREXP(k), asking for an exploration of the greatest possible number of edges. We fully characterize MAXSTAREXP(k) in terms of complexity. We also partially characterize STAREXP(k), showing that it is in P for k<4, but is NP-complete, for every k>5. Finally, we partially characterize classes of “random” temporal stars which are, asymptotically almost surely, yes-instances and no-instances for STAREXP(k).

Item Type: Article
Uncontrolled Keywords: Temporal networks, Exploration, Random input, Edge availability
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 08 Apr 2021 07:55
Last Modified: 18 Jan 2023 22:53
DOI: 10.1016/j.jcss.2021.04.001
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