The classical degree realization problem is defined as follows: Given a sequence d̄ = (d_1,…,d_n) of positive integers, construct an n-vertex graph in which each vertex u_i has degree d_i (or decide that no such graph exists). In this article, we present and study the related selected neighbor degree realization problem, which requires that each vertex u_i of G has a neighbor of degree d_i. We solve the problem when G is required to be acyclic (i.e., a forest), and present a sufficient and necessary condition for a given sequence to be realizable.
@InProceedings{barnoy_et_al:LIPIcs.ISAAC.2021.27, author = {Bar-Noy, Amotz and Peleg, David and Rawitz, Dror and Yehezkel, Elad}, title = {{Selected Neighbor Degree Forest Realization}}, booktitle = {32nd International Symposium on Algorithms and Computation (ISAAC 2021)}, pages = {27:1--27:15}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-214-3}, ISSN = {1868-8969}, year = {2021}, volume = {212}, editor = {Ahn, Hee-Kap and Sadakane, Kunihiko}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ISAAC.2021.27}, URN = {urn:nbn:de:0030-drops-154609}, doi = {10.4230/LIPIcs.ISAAC.2021.27}, annote = {Keywords: network realization, graph algorithms, lower bound} }
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