The Steiner Traveling Salesman Problem With Online Edge Blockages
European Journal of Operational Research
We consider the online Steiner Traveling Salesman Problem. In this problem, we are given an edge-weighted graph G = (V, E) and a subset D⊆V of destination vertices, with the optimization goal to find a minimum weight closed tour that traverses every destination vertex of D at least once. During the traversal, the salesman could encounter at most k non-recoverable blocked edges. The edge blockages are real-time, meaning that the salesman knows about a blocked edge whenever it occurs. We first show a lower bound on the competitive ratio and present an online optimal algorithm for the problem. While this optimal algorithm has non-polynomial running time, we present another online polynomial-time near optimal algorithm for the problem. Experimental results show that our online polynomial-time algorithm produces solutions very close to the offline optimal solutions.
Zhang, Huili, Weitian Tong, Yinfeng Xu, Guohui Lin.
"The Steiner Traveling Salesman Problem With Online Edge Blockages."
European Journal of Operational Research, 243 (1): 30-40.