Approximation and Online Algorithms

This book constitutes the refereed proceedings of the 21st International WorkshoponApproximation and Online Algorithms, WAOA 2023, held in Amsterdam, The Netherlands,duringSeptember 7-8, 2023 The 16 full papers included in this book are carefully reviewed and selected from 43 submissions. The topics of WAOA 2023 were algorithmic game theory, algorithmic trading, coloring and partitioning, competitive analysis, computational advertising, computational finance, cuts and connectivity, FPT-approximation algorithms, geometric problems, graph algorithms, inapproximability results, mechanism design, network design, packing and covering, paradigms for the design and analysis of approximation and online algorithms, resource augmentation, and scheduling problems