M The member set of carriers in the alliance, M ¼ f1; ... ; mg Rl The set of requests for the carrier l; l 2 M; Rl ¼ f0g[f1; ... ;rlg. The request numbered 0 indicates the start node and the end node are depots, and the distance between them is 0
M The member set of carriers in the alliance, M ¼ f1; ... ; mgRl The set of requests for the carrier l; l 2 M; Rl ¼ f0g[f1; ... ;rlg. The request numbered 0 indicates the start node andthe end node are depots, and the distance between them is 0