Round-Trip Emergency Supply Distribution Model Based on Nonfixed Routes

Table 1

Simplified algorithm flow table.

Step 0	Initialize and import model parameters
Step 1	Form the initial solution
Step 2	Optimize the solution with 2-opt
Step 3	Take the current optimal solution into the tabu list
Step 4	Form candidate solutions with the cross-exchange
Step 5	Check the time window constraint
Step 6	Calculate the objective function
Step 7	Check the tabu length
Step 8	Check the current optimal solution
Stopping rule	If n ≥ nmax, terminate the algorithm