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Convex and isometric domination of (weak) dominating pair graphsBrešar, Boštjan ; Gologranc, Tanja ; Kos, TimMnožica vozlišč ▫$D$▫ v grafu ▫$G$▫ je dominantna množica, če ima vsako vozlišče grafa ▫$G$▫, ki ni v ▫$D$▫, kakšno sosednje vozlišče iz ▫$D$▫. Množica vozlišč ▫$D$▫ grafa ▫$G$▫ je konveksna ... (izometrična), če vsa vozlišča na vseh najkrajših poteh (oz. vsa vozlišča na kaki najkrajši poti) med poljubnima vozliščema iz ▫$D$▫ ležijo v ▫$D$▫. V tem članku obravnavamo problem določitve najmanjše konveksne (oz. izometrične) dominantne množice z algoritmičnega vidika. Za razred šibkih grafov dominantnega para (to je grafov, ki premorejo dominantni par, ki je definiran kot takšen par vozlišč ▫$x,y\in V(G)$▫, za katerega vozlišča, ki ležijo na poljubni poti med ▫$x$▫ in ▫$y$▫, tvorijo dominantno množico) predstavimo učinkovit algoritem, ki najde najmanjšo izometrično dominantno množico takega grafa. Po drugi strani dokažemo, da je odločitveni problem, ali obstaja konveksna dominantna množica moči, omejene z danim poljubno izbranim naravnim številom, NP-poln in je takšen celo, če se omejimo na šibke grafe dominantnega para, ki so tetivni. Če nadalje omejimo obravnavani razred grafov na tetivne grafe dominantnega para (to je tetivne grafe, v katerih vsak povezan induciran podgraf premore dominantni par), pa uspemo najti polinomski algoritem, ki poišče moč najmanjše konveksne dominantne množice takega grafa.Source: Theoretical computer science. - ISSN 0304-3975 (Vol. 730, June 2018, str. 32-43)Type of material - article, component part ; adult, seriousPublish date - 2018Language - englishCOBISS.SI-ID - 18371161
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Brešar, Boštjan | 17005 |
Gologranc, Tanja | 32028 |
Kos, Tim | 38147 |
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