lingo编一个程序 sets:supplyment/s1..s20/:supply;receiver/r1..r20/

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lingo编一个程序
sets:
supplyment/s1..s20/:supply;
receiver/r1..r20/:demand;
links(supplyment,receiver ):cost,v,s;
endsets
min=@sum(links:cost*s);
@for(receiver(J):
@sum(supplyment(I):v(I,J))=demand(J));
@for(supplyment(I):
@sum(receiver(J):v(I,J))

最后一句集名后面带上下标

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