lingo 约束条件 顺序

lingo 约束条件 顺序
lingo中,约束条件的顺序对结果有什么影响?为什么?
程序1
model:
sets:
worker/w1..w5/:;
job/j1..j5/:;
links(worker,job):c,x;
endsets
data:
c=8,6,10,9,12,
9,12,7,11,9,
7,4,3,5,8,
9,5,8,11,8,
4,6,7,5,11;
enddata
min=@sum(links:c*x);
@for(job(j):@sum(worker(i):x(i,j))=1);
@for(worker(i):@sum(job(j):x(i,j))=1);
@for(links:@bin(x));
end
程序2
model:
sets:
worker/w1..w5/:;
job/j1..j5/:;
links(worker,job):c,x;
endsets
data:
c=8,6,10,9,12,
9,12,7,11,9,
7,4,3,5,8,
9,5,8,11,8,
4,6,7,5,11;
enddata
min=@sum(links:c*x);
@for(worker(i):@sum(job(j):x(i,j))=1);
@for(job(j):@sum(worker(i):x(i,j))=1);
@for(links:@bin(x));
end
的结果不一样，为什么呢？