Abstract
This paper considers a transportation problem which is different from the conventional model. Suppose we are given many storages (nodes) to store multiple kinds of commodities together with roads (edges) interconnecting them, which are specified as a weighted graph. Some storages have surplus and others have shortages. Problem is to determine whether there are transportations to eliminate all of shortages. For transportation we can use a vehicle with the loading capacity at each node. Each vehicle visits one of its neighbors with some commodities which are unloaded at the neighbor. Then, we load some other commodities there, and then bring them back to the original node. How to design such send-and-bring-back transportations to eliminate all shortages is the problem. When we define a single round of transportations to be a set of those transportations at all nodes, whether there is a single round of valid transportations that eliminate all of shortages is our concern. After proving NP-completeness of the problem we present a linear time algorithm for a special case where an input graph is a forest.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Andrews, G.E., Eriksson, K.: Integer Partitions. Cambridge University Press, Cambridge (2004)
Appa, G.M.: The Transportation problem and its variants. Oper. Res. Q. 24, 79–99 (1973)
Cormen, T.H., Leiserson, C.E., Rivest, R.L., Stein, C.: Introduction to Algorithms, 2nd edn. MIT Press and McGraw-Hill (2001)
Peleg, S., Werman, M., Rom, H.: A unified approach to the change of resolution: space and gray-level. IEEE Trans. Pattern Anal. Mach. Intell. 11, 739–742 (1989)
Acknowledgment
This work was supported by JSPS KAKENHI Grant Number JP20K11673. The author would like to thank David Kirkpatrick and Ryuhei Uehara for giving a version of the NP-completeness proof of the transportation problem in two dimensions.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2021 Springer Nature Switzerland AG
About this paper
Cite this paper
Asano, T. (2021). A New Transportation Problem on a Graph with Sending and Bringing-Back Operations. In: Uehara, R., Hong, SH., Nandy, S.C. (eds) WALCOM: Algorithms and Computation. WALCOM 2021. Lecture Notes in Computer Science(), vol 12635. Springer, Cham. https://doi.org/10.1007/978-3-030-68211-8_2
Download citation
DOI: https://doi.org/10.1007/978-3-030-68211-8_2
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-68210-1
Online ISBN: 978-3-030-68211-8
eBook Packages: Computer ScienceComputer Science (R0)