怎么输入输出函数？谢谢
TITLE DISTRIBUTION PROBLEM;SETS:
RDC/A,B,C/;
Retailer/w,x,y,z/;
LINKS(RDC,Retailer):x,C,D1,D2,Z;
ENDSETS
DATA:
C=1,1,1,1,
1,1,1,1,
1,1,1,1;
D1=20,10,30,20,
40,20,15,10,
30,10,15,20;
D2=200,300,250,150,
300,200,300,400,
100,200,300,200;
M=99999999;
ENDDATA
min=@sum(LINKS(j,k):x(j,k)*C(j,k)*D2(j,k));
@for(Retailer(k):@sum(RDC(j):x(j,k)*4)>=@sum(RDC(j):D1(j,k)));
@for(RDC(j):@sum(Retailer(k):Z(j,k))>=1);
@for(LINKS(j,k):Z(j,k)<=300/D2(j,k));
@for(LINKS(j,k):@bin(Z(j,k)));
@for(LINKS(j,k):@gin(x(j,k)));
@TEXT()=@WRITEFOR(LINKS(j,k)|x(j,k)#GT#0:@NAME(x),'',x,@NEWLINE(1));
END
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