lingo模型定义出错问题model: sets: center/1..3/:u; addr/1..7/:v; w(center,addr):x,y;endsets data: y=36 24 49 21 81 72 4530 20 56 24 99 88 5536 24 63 27 90 80 50 ;enddatamin=@sum(w:x(i,j)*y(i,j));@sum(addr:x(1,j))=3;@sum(addr:x(2,j))=2;@sum(a