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Journal articles (2003), Networks, 42 (3), pp. 154-159

Reoptimizing the traveling salesman problem

ARCHETTI Claudia , Bertazzi Luca, Speranza Maria Grazia

In this paper, we study the reoptimization problems which arise when a new node is added to an optimal solution of a traveling salesman problem (TSP) instance or when a node is removed. We show that both reoptimization problems are NP‐hard. Moreover, we show that, while the cheapest insertion heuristic has a tight worst‐case ratio equal to 2 when applied to a TSP instance, it guarantees, in linear time, a tight worst‐case ratio equal to 3/2 when used to add the new node and that also the simplest heuristic to remove a node from the optimal tour guarantees a tight ratio equal to 3/2 in constant time. Link to the article

ARCHETTI, C., BERTAZZI, L. and SPERANZA, M.G. (2003). Reoptimizing the traveling salesman problem. Networks, 42(3), pp. 154-159.

Keywords : #reoptimization-problems