lingo 报错 model is ill definedmodel:sets: warehouses/wh1..wh3/: capacity; vendors/v1..v8/: demand; links(warehouses,vendors): cost,volume,x;endsets min=@sum(links: cost*volume)-@sum(links|x #eq# 1:0.5*cost*volume); @for(links: @bin(x)); @s

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