Efficient solutions to some transportation problems with applications to minimizing robot arm travel
SIAM Journal on Computing
Preemptive ensemble motion planning on a tree
SIAM Journal on Computing
NP-completeness of some edge-disjoint paths problems
Discrete Applied Mathematics
Perturbation heuristics for the pickup and delivery traveling salesman problem
Computers and Operations Research
IBM Journal of Research and Development
On the complexity of the Eulerian closed walk with precedence path constraints problem
Theoretical Computer Science
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In this paper, we study a variant of the well-known single-vehicle pickup and delivery problem where the demands can be unloaded/reloaded at any node. By proving new complexity results, we give the minimum information which is necessary to represent feasible solutions. Using this, we present integer linear programs for both the unitary and the general versions. We then show that the associated linear relaxations are polynomial-time solvable and present some computational results.