Title: Efficient heuristic pricing for vehicle routing problems

Speaker:  Rafael Martinelli – Pontifícia Universidade Católica do Rio de Janeiro, Brazil

We consider the problem of finding columns of negative reduced costs within a column generation solver for Vehicle Routing Problems (VRPs). We propose efficient local search evaluators to handle the several features needed, including cycle-elimination constraints and limited-memory subset-row inequalities, in addition to classical structural constraints of most vehicle routing applications such as vehicle capacity and time windows. We embed these operators within a multi-start iterated local search heuristic and solve instances derived from two classical VRPs, namely the Capacitated VRP (CVRP) and the VRP with time windows (VRPTW).

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