LINGO出现问题1017 sets:\x05department/A,B,C,D,E/;\x05city/1,2,3/;\x05benefit(department,city):B,x;\x05dist(city,city):C;\x05comm(department,department):D;\x05matrix(department,city,department,city);endsetsmax=10000*@sum(benefit(i,j):B(i,j)*x(i,j)

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