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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vestifm</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-математических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-2430</issn><issn pub-type="epub">2524-2415</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-2430-2022-58-2-155-168</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-640</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАТЕМАТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICS</subject></subj-group></article-categories><title-group><article-title>азбиение ребер двудольного графа на наименьшее число подграфов, изоморфных подграфам простого цикла порядка 4</article-title><trans-title-group xml:lang="en"><trans-title>Partitioning the edge set of a bipartite graph into the minimal number of subgraphs isomorphic to those of a simple 4 order cycle</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дугинов</surname><given-names>О. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Duginov</surname><given-names>O. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дугинов Олег Иванович – кандидат физико-математических наук, доцент кафедры дискретной математики и алгоритмики</p><p>пр. Независимости, 4, 220030, Минск</p></bio><bio xml:lang="en"><p>Oleg I. Duginov – Ph. D. (Physics and Mathematics), Associate Professor of the Department of Discrete Mathematics and Algorithmics</p><p>4, Nezavisimosti Ave., 220030, Minsk</p></bio><email xlink:type="simple">oduginov@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Химич</surname><given-names>С. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Khimich</surname><given-names>S. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Химич Семен Сергеевич – студент, факультет прикладной математики и информатики</p><p>пр. Независимости, 4, 220030, Минск</p></bio><bio xml:lang="en"><p>Semyon S. Khimich – Student at Faculty of Applied Mathematics and Computer Science</p><p>4, Nezavisimosti Ave., 220030, Minsk</p></bio><email xlink:type="simple">semyonximich@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Belarusian State University</institution><country>Belarus</country></aff><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>05</day><month>07</month><year>2022</year></pub-date><volume>58</volume><issue>2</issue><fpage>155</fpage><lpage>168</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дугинов О.И., Химич С.С., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Дугинов О.И., Химич С.С.</copyright-holder><copyright-holder xml:lang="en">Duginov O.I., Khimich S.S.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestifm.belnauka.by/jour/article/view/640">https://vestifm.belnauka.by/jour/article/view/640</self-uri><abstract><p>Изучается вычислительная сложность задачи разбиения ребер двудольного графа на наименьшее число подграфов, изоморфных подграфам простого цикла порядка 4, в специальных классах графов. Задача относится к числу NP-трудных и находит применение при организации распределения сетевых пакетов по каналам связи в процессе передачи от одного маршрутизатора к другому. Разработан алгоритм, решающий задачу в классе деревьев порядка n за время O(n log n). Выделены трудноразрешимые случаи задачи.</p></abstract><trans-abstract xml:lang="en"><p>In this paper, we study the computational complexity for a problem of partitioning the edge set of a bipartite graph into the minimal number of subgraphs isomorphic to those of a simple cycle of order 4 in special graph classes. This problem is NP-hard and finds application in organizing the distribution of network packets over communication channels in the process of transmission from one router to another. We develop an O(nlogn) algorithm for solving that problem in a class of n order trees. Intractable cases of the problem are identified.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>разбиение множества ребер графа</kwd><kwd>деревья</kwd><kwd>подграфы простого цикла порядка 4</kwd></kwd-group><kwd-group xml:lang="en"><kwd>partitioning the edge set of a graph</kwd><kwd>trees</kwd><kwd>subgraphs of a simple cycle of order 4</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование первым автором выполнено при финансовой поддержке Белорусского республиканского фонда фундаментальных исследований (проект № Ф21РМ-001).</funding-statement><funding-statement xml:lang="en">The research was carried out by the first author under the financial support of the Belarusian Republican Foundation for Fundamental Research (project no. Ф21РМ-001)</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Лекции по теории графов / В. А. 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