SOFSEM 2023: theory and practice of computer science : 48th International Conference on Current Trends in Theory and Practice of Computer Science SOFSEM 2023 Nový Smokovec Slovakia January 15 18 2023 : proceedings This book constitutes the conference proceedings of the 48th International Conference on Current Trends in Theory and Practice of Computer Science SOFSEM 2023 held in Novì Smokovec Slovakia during January 15 18 2023.The 22 full papers presented together with 2 best papers and 2 best students papers in this book were carefully reviewed and selected from 43 submissions.This workshop focuses on graphs problems and optimization; graph drawing and visualization; NP hardness and fixed parameter tractability; communication and temporal graphs; complexity and learning; and robots and strings