In this problem, the set of nodes is divided in 2: users and facilities. The TSP Lib format uses 1 set only, so for this problem, it has to be modified by adding an extra column on the coordinates that will indicate if a node is a user or a facility.
In this problem, the set of nodes is divided in 2: users and facilities. The TSP Lib format uses 1 set only, so for this problem, it has to be modified by adding an extra column on the coordinates that will indicate if a node is a user or a facility.