The Steiner traveling salesman problem (Steiner TSP, or STSP) is an extension of the traveling salesman problem. Given a list of cities, some of which are required, and the lengths of the roads between them, the goal is to find the shortest possible walk that visits each required city and then returns to the origin city [1]. During a walk, vertices can be visited more than once, and edges may be traversed more than once[2].
References
Interian, Ruben; Ribeiro, Celso C. (15 July 2017). "A GRASP heuristic using path-relinking and restarts for the Steiner traveling salesman problem". International Transactions in Operational Research. 24 (6): 1307–1323. doi:10.1111/itor.12419.
Álvarez-Miranda, Eduardo; Sinnl, Markus (2019-09-05). "A note on computational aspects of the Steiner traveling salesman problem". International Transactions in Operational Research. 26 (4): 1396–1401. doi:10.1111/itor.12592.
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