lingo高手进来看一下 急！！！！！！

pike

<>model:
sets:
city/1..5/:u;
link(city,city):dist,x;
endsets
data:
dist=50000 132 217 164 58
     132 50000 290 201 79
     217 290 50000 113 303
     164 201 113 50000 196
     58 79 303 196 50000;
enddata
n=@size(city);
min=@sum(link:dist*x);
@for(city(k)sum(city(i):x(i,k))=1;);
@for(city(k)sum(city(j):x(k,j))=1;);
@for(city(k)for(city(j)|j #GT# 1 #and #k#GT#1:u(j)-u(k)+n*x(j,k)&lt;n-1;));
@for(link:@bin(x););
end</P>
<>里面的U(I)指什么东西，怎么算出来的</P>

zyhwan

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