Hi tutflixer,
for the past two weeks i have been depressed and sick because of my thesis. My thesis is about VRP with time windows, i solved it with Lingo.
I have tried various ways ranging from changing the mathematical model, moving to gurobi, clustering. But all those ideas seems doesn't work. My nodes are just like at max 17 nodes (after clustering) and still not get the solution. I have been running it for like 10 hours. I find it suspicious as when i comment that time windows constraint, the solution comes under 1 minutes. Does anyone can help me how to get the optimal solution? Thanks for the time and have a nice day
for the past two weeks i have been depressed and sick because of my thesis. My thesis is about VRP with time windows, i solved it with Lingo.
I have tried various ways ranging from changing the mathematical model, moving to gurobi, clustering. But all those ideas seems doesn't work. My nodes are just like at max 17 nodes (after clustering) and still not get the solution. I have been running it for like 10 hours. I find it suspicious as when i comment that time windows constraint, the solution comes under 1 minutes. Does anyone can help me how to get the optimal solution? Thanks for the time and have a nice day