“…According to the logistics process of JD, the task is divided into 12 subtasks, as shown in Figure 6, in which the line represents a subtask and the node represents a handover between subtasks. The candidate enterprise set for each subtask is: E 1 = e 1 1 , e 2 1 , e 3 1 , E 2 = e 1 2 , e 2 2 , e 3 2 , e 4 2 , E 3 = e 1 3 , e 2 3 , e 3 3 , e 4 3 , E 4 = e 1 4 , e 2 4 , . .…”