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Proceedings Fourth Athens Colloquium on Algorithms and Complexity, ACAC 2009, Athens, Greece, August 20-21, 2009

ACAC 2009 is organized by the Athens University of Economics and Business (AUEB) and it is the fourth in a series of meetings that aim to bring together researchers working on all areas of the theory of algorithms and computational complexity. These meetings are expected to serve as a lively forum for presenting results that are in a preliminary stage or have been recently presented in some major conference. For the first time this year all submitted papers were reviewed and ACAC also offered to the authors the choice of publishing their contribution (provided it has not been published anywhere else before) with the post-proceedings of EPTCS (Electronic Proceedings in Theoretical Computer Science).