Multi-channel last-mile vehicle routing: instances, code and results

Replication package for the manuscript "Multi-channel last-mile vehicle routing with a two-sided holding period: mixed-integer model and feasibility-complete metaheuristic." Contains the 33 generated benchmark instances (as standalone JSON and as generator arguments), the instance generator and mixed-integer model, the FC-SHADE metaheuristic and all baselines, and the campaign result files cited in the manuscript. See README.md inside the archive for reproduction instructions.