sum(demand(j):c(i,j))<sup(i));
sum(suply(i):c(i,j))>dem(j));
sum(demand(j):c(i,j))<sup(i));
sum(supply(i):c(i,j))>dem(j));
)
sum(demand(j):c(j,i))<sup(i));
sum(supply(i):c(j,i))>dem(j));
sum(demand(j):c(i,j))<sup(i));中suply少个p
sum(suply(i):c(i,j))>dem(j));中suply少个p


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