Session 1 -- Towards a Theory of Algorithms -- Session 2A -- k-Restricted Rotation with an Application to Search Tree Rebalancing -- Heap Building Bounds -- Session 2B -- The Multi-radius Cover Problem -- Parameterized Complexity of Generalized Vertex Cover Problems -- The Complexity of Implicit and Space Efficient Priority Queues -- Analysis of a Class of Tries with Adaptive Multi-digit Branching -- Balanced Aspect Ratio Trees Revisited -- Session 3B -- Improved Combinatorial Group Testing for Real-World Problem Sizes -- Parameterized Counting Algorithms for General Graph Covering Problems -- Approximating the Online Set Multicover Problems via Randomized Winnowing -- Session 4A -- Max-stretch Reduction for Tree Spanners -- Succinct Representation of Triangulations with a Boundary -- Line-Segment Intersection Made In-Place -- Session 4B -- Improved Fixed-Parameter Algorithms for Two Feedback Set Problems -- Communication-Aware Processor Allocation for Supercomputers -- Dynamic Hotlinks -- Session 6A -- The Minimum-Area Spanning Tree Problem -- Hinged Dissection of Polypolyhedra -- Session 6B -- Convex Recolorings of Strings and Trees: Definitions, Hardness Results and Algorithms -- Linear Time Algorithms for Generalized Edge Dominating Set Problems -- Session 7A -- On Geometric Dilation and Halving Chords -- Orthogonal Subdivisions with Low Stabbing Numbers -- Kinetic and Dynamic Data Structures for Convex Hulls and Upper Envelopes -- Session 7B -- Approximation Algorithms for Forests Augmentation Ensuring Two Disjoint Paths of Bounded Length -- A Dynamic Implicit Adjacency Labelling Scheme for Line Graphs -- The On-line Asymmetric Traveling Salesman Problem -- Session 8A -- All-Pairs Shortest Paths with Real Weights in O(n 3/log n) Time -- k-Link Shortest Paths in Weighted Subdivisions -- Power-Saving Scheduling for Weakly Dynamic Voltage Scaling Devices -- Session 8B -- Improved Approximation Algorithms for Metric Maximum ATSP and Maximum 3-Cycle Cover Problems -- On the Vehicle Routing Problem -- Session 9A -- The Structure of Optimal Prefix-Free Codes in Restricted Languages: The Uniform Probability Case -- Tradeoffs Between Branch Mispredictions and Comparisons for Sorting Algorithms -- Derandomization of Dimensionality Reduction and SDP Based Algorithms -- Session 9B -- Subquadratic Algorithms for 3SUM -- Near-Optimal Pricing in Near-Linear Time -- Improved Approximation Bounds for Planar Point Pattern Matching.

This book constitutes the refereed proceedings of the 9th International Workshop on Algorithms and Data Structures, WADS 2005, held in Waterloo, Canada, in August 2005. The 37 revised full papers presented were carefully reviewed and selected from 90 submissions. A broad variety of topics in algorithmics and data structures is addressed including searching and sorting, approximation, graph and network computations, computational geometry, randomization, communications, combinatorial optimization, scheduling, routing, navigation, coding, and pattern matching.