The papers in this volume were presented at the Sixth Workshop on Algorithms and Data Structures (WADS '99). In addition to these submitted papers, the program committee invited the following researchers to give plenary lectures at the workshop: C.

Optimization over k-set Polytopes and Efficient k-set Enumeration.- Line Simplification with Restricted Orientations.- The T-join Problem in Sparse Graphs: Applications to Phase Assignment Problem in VLSI Mask Layout.- Resizable Arrays in Optimal Time and Space.- Hash and Displace: Efficient Evaluation of Minimal Perfect Hash Functions.- Design and Analysis of Algorithms for Shared-Memory Multiprocessors.- On the Complexity of Orthogonal Compaction.- Optimizing Constrained Offset and Scaled Polygonal Annuli.- The Accomodating Function — A Generalization of the Competitive Ratio.- Performance Guarantees for the TSP with a Parameterized Triangle Inequality.- Robot Map Verification of a Graph World.- Searching Rectilinear Streets Completely.- General Multiprocessor Task Scheduling: Approximate Solutions in Linear Time.- The Lazy Bureaucrat Scheduling Problem.- Generating 3D Virtual Populations from Pictures of a Few Individuals.- Testing the Quality of Manufactured Balls.- On an Optimal Split Tree Problem.- Representing Trees of Higher Degree.- Indexing and Dictionary Matching with One Error (Extended Abstract).- New Results on Fault Tolerant Geometric Spanners.- Tiered Vectors: Efficient Dynamic Arrays for Rank-Based Sequences.- Go-With-The-Winners Heuristic.- 2-Point Site Voronoi Diagrams.- A Parallel Algorithm for Finding the Constrained Voronoi Diagram of Line Segments in the Plane.- Position-Independent Street Searching.- Approximation Algorithms for 3-D Common Substructure Identification in Drug and Protein Molecules.- A Tight Bound for ?-Skeleton of Minimum Weight Triangulations.- Rectilinear Static and Dynamic Discrete 2-center Problems.- Gene Trees and Species Trees: The Gene-Duplication Problem is Fixed-Parameter Tractable.- Efficient Web Searching UsingTemporal Factors.- Elastic Labels Around the Perimeter of a Map.- Optimal Facility Location under Various Distance Functions.- Thresholds for Sports Elimination Numbers: Algorithms and Complexity.- Dynamic Representations of Sparse Graphs.- Online Data Structures in External Memory.

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