lingao高手帮帮忙啊！

xxh5250

<><BR>MODEL:<BR>SETS:<BR>  demand/1..100/:d;<BR>  supply/1..1000/;<BR>  link(demand,supply):c,x,a;<BR>endsets<BR><a href="mailtmax=@sum(link(i,j):a(i,j)*x(i,j" target="_blank" >max=@sum(link(i,j):a(i,j)*x(i,j</A>));<BR><a href="mailta=@if(c" target="_blank" >a=@if(c</A> #gt# 0,1/c,0);<BR></P>
<>在运行时，a  怎么出项问题了 啊 ？</P>