Question

求Lingo高手帮忙混合整数规划求解!求Lingo编程!

Answer 1

model:

sets:

city/1..5/:x,demand;

link(city,city):c,time;

endsets

data:

price=20;

time=

1 2 3 3 2

2 1 2 3 3

3 2 1 2 3

3 3 2 1 2

1 3 3 2 1;

demand=20 30 10 15 25;

enddata

min=@sum(city(j):demand(j)*@sum(city(i):c(i,j)*time(i,j)));

@sum(city:x)=2;

@for(city(i):@for(city(j):c(i,j)