A Study on Online Scheduling Problem of Integrated Order Picking and Delivery with Multizone Vehicle Routing Method for Online-to-Offline Supermarket

Algorithm 1

A.

(1)

Picking part: schedule all arrived orders according to algorithm Apick [3] regardless of which zones they belong to. The completed orders are assigned to the delivery part.

(2)

Delivery part: for each zone l, the delivery decision is made once one of the following two situations happens: (1) the number of completed undelivered orders is ; (2) the delivery time of the route is larger than Dl, and the route rl contains all the completed undelivered orders in zone l. As there is only one route at every delivery decision point, the delivery route can be calculated by solving the travelling salesman problem (TSP) [15].