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The papers in this volume were presented at the 5th Italian Conference on AlgorithmsandComplexity(CIAC2003). Theconferencetookplaceduring May 28–30, 2003, in Rome, Italy, at the Conference Centre of the University of Rome “La Sapienza. ” CIAC started in 1990 as a national meeting to be held every three years for Italian researchers in algorithms, data structures, complexity theory, and parallelanddistributedcomputing. Duetoasigni?cantparticipationofforeign researchers, starting from the second edition, CIAC evolved into an international conference. However,alltheeditionsofCIAChavebeenheldinRome. The proceedings of CIAC were published by World Scienti?c for the ?rst edition and by Springer-Verlag in the Lecture Notes in Computer Science series (volumes 778,1203and1767)forthesubsequenteditions. Aselectionofthepapersofthe fourth edition was published in a special issue of Theoretical Computer Science Vol. 285(1),2002. Thisyearweexpecttopublishanextendedversionofselected papers presented at the conference in a special issue of the journal Theory of Computing Systems. In response to the call for papers for CIAC 2003, 57 papers were subm- ted, from which the Program Committee selected 23 papers for presentation at theconferencefrom18countries. Eachpaperwasevaluatedbyatleastthree Program Committee members with the help of 63 external reviewers. In addition to the selected papers, the Organizing Committee invited CharlesE. Leiserson(Cambridge),DavidPeleg(Rehovot),MichaelO. Rabin (CambridgeandJerusalem),JohnE. Savage(Providence),andLucaTrevisan (Berkeley)togiveplenarylecturesattheconference. Moreover,threetutorials byDavidPeleg,JaymeL. Szwarc?ter(RiodeJaneiro)andLucaTrevisanwere o?ered in the days preceding the conference. We wish to express our appreciation to all the authors of the submitted - pers, to the Program Committee members and the referees, to the Organizing Committee, and to the plenary and tutorial lecturers who accepted our in- tation.
Tutorials.- Localized Network Representations.- Optimal Binary Search Trees with Costs Depending on the Access Paths.- On the Generation of Extensions of a Partially Ordered Set.- Error-Correcting Codes in Complexity Theory.- Invited Talks.- Cache-Oblivious Algorithms.- Spanning Trees with Low Maximum/Average Stretch.- Hyper Encryption and Everlasting Secrets.- Computing with Electronic Nanotechnologies.- Regular Contribution.- Efficient Update Strategies for Geometric Computing with Uncertainty.- Maximizing the Guarded Boundary of an Art Gallery Is APX-Complete.- An Improved Algorithm for Point Set Pattern Matching under Rigid Motion.- Unlocking the Advantages of Dynamic Service Selection and Pricing.- The Relative Worst Order Ratio for On-Line Algorithms.- On-Line Stream Merging, Max Span, and Min Coverage.- Randomised Algorithms for Finding Small Weakly-Connected Dominating Sets of Regular Graphs.- Additive Spanners for k-Chordal Graphs.- Graph-Modeled Data Clustering: Fixed-Parameter Algorithms for Clique Generation.- Reconciling Gene Trees to a Species Tree.- Generating All Forest Extensions of a Partially Ordered Set.- Indexing Structures for Approximate String Matching.- Approximation Hardness for Small Occurrence Instances of NP-Hard Problems.- Fast Approximation of Minimum Multicast Congestion — Implementation versus Theory.- Approximation of a Retrieval Problem for Parallel Disks.- On k-Edge-Connectivity Problems with Sharpened Triangle Inequality.- The Complexity of Detecting Fixed-Density Clusters.- Nearly Bounded Error Probabilistic Sets.- Some Properties of MODm Circuits Computing Simple Functions.- XOR-Based Schemes for Fast Parallel IP Lookups.- The Impact of Network Structure on the Stability of Greedy Protocols.- Improving Customer Proximity to Railway Stations.- Differential Approximation for Some Routing Problems.