临时工班次安排问题。。lingo代码求解。。

如果临时工每班工作时间可以是3h，也可以是4h，那么，应如
何安排临时工的班次，使得使用临时工的总成本最小。这时要安排的临时工班次
是多少？
快餐店用工问题，lingo代码求解。。谢谢啦。。帮忙修改一下代码。
model：
SetS：
row／1…11／：b;arrange／1…11／：x,C;link(row,arrange)：a;
endsets
data:
b=8,8,7,1,2,1,5,10,10,6,6;
c=12,16,16,16,16,16,12,16,16,16,12;
a=l,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,
0,0,1,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,0,
0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,1,l,1,0,0,0,0,0,0,0,0,
1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1;
enddata
[OBJ]min=@sum(arrange(j)：C(j)*x(j));@for(row(i)：@sum(arrange(j)：
a(i,j)*x(j))>=b(i););
@for(arrange(j)：x(j)>=0;);
End

model:
sets:
row/1..11/:b;arrange/1..11/:x,c;link(row,arrange):a;
endsets
data:
b=8,8,7,1,2,1,5,10,10,6,6;
c=12,16,16,16,16,16,12,16,16,16,12;
a=1,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,
0,0,1,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,0,
0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,
1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1;
enddata
[obj]min=@sum(arrange(j):c(j)*x(j));@for(row(i):@sum(arrange(j):
a(i,j)*x(j))>=b(i););
end

model: SetS: row/1..11/:b;arrange/1..11/:x,C;link(row,arrange):a; endsets data: b=8,8,7,1,2,1,5,10,10,6,6; c=12,16,16,16,16,16,12,16,16,16,12; a=1,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,0, 0,0,1,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,0, 0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0, 1,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1; enddata [OBJ]min=@sum(arrange(j):C(j)*x(j));@for(row(i):@sum(arrange(j): a(i,j)*x(j))>=b(i);); End