lingo求矩阵列之和怎么求在J=1的时候所有volume(I,J)的和啊 sets:supplyment/s1..s20/:supply;receiver/r1..r20/:demand;links(supplyment ,receiver):cost,volume;endsets目标函数;min=@sum(links:cost*volume);需求约束;@for(receiver(J):@
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