head section
Integer getN()
Integer getM()
Integer getCantidad(Integer i)
Integer getDemanda(Integer j)
Integer getCoste(Integer i, Integer j)
Integer n = getN()
Integer m = getM()

goal section
min sum(getCoste(i,j) x[i,j], i in 0 .. n, j in 0 .. m)

constraints section
sum(x[i,j], i in 0 .. n) >= getDemanda(j), j in 0 .. m
sum(x[i,j], j in 0 .. m) <= getCantidad(i), i in 0 .. n

int
x[i,j], i in 0 .. n, j in 0 .. m