Solving the Single-Vehicle Scheduling Problems for All Home Locations under Depth-First Routing on a Tree (Special Section on Discrete Mathematics and Its Applications)

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We consider a single-vehicle scheduling problem on a tree, where each vertex has a job with a release time and a processing time and each edge has a travel time. There is a single vehicle which starts from a start vertex s and reaches a goal vertex g after finishing all jobs. In particular, s is called a home location if s=g. The objective of the problem is to find a depth-first routing on T so as to minimize the completion time. In this paper, we first show that the minimum completion times of the problem for all home locations s'∈V can be simultaneously computed in O(n) time, once the problem with a specified home location s'∈V has been solved, where n is the number of vertices. We also show that given a specified start vertex s, the minimum completion times for all goal vertices g can be computed in O(n) time.
社団法人電子情報通信学会の論文
2001-05-01