谁能帮俺下啊-看看这个LINGO 程序哪错了
<P>MODEL:<BR> SETS:<BR>CITY/1..6/:U;<BR>LINK(CITY,CITY):<BR> DIST,<BR> X;<BR> ENDSETS<BR>data:<BR> DIST=0,2,1,2,0,0<BR> 2,0,1,4,1,0<BR> 1,1,0,1,0,0<BR> 2,4,1,0,1,1<BR> 0,1,0,1,0,2<BR> 0,0,0,1,2,0;<BR>enddata<BR><a href="mailto:N=@size(CITY" target="_blank" >N=@size(CITY</A>);<BR><a href="mailto:min=@sum(LINK:DIST*X" target="_blank" >min=@sum(LINK:DIST*X</A>);<BR>@for(CITY(K):<BR> @sum(CITY(I)|I#NE#K:X(I,K))=1;<BR> @sum(CITY(J)|I#NE#K:X(K,J))=1;<BR> @for(CITY(J)|J#GT#1#AND#J#NE#K:<BR>U(J)>=U(K)+X(K,J)-(N-2)*(1-X(K,J))+(N-3)*X(J,K);<BR> );<BR>);<BR>@for(LINK:@BIN(x));<BR>@for(CITY(K)|K#GT#1:<BR> U(K)<=N-1-(N-2)*X(1,K);<BR> U(K)>=1+(N-2)*X(K,1)<BR> );<BR>end</P><P>谢谢各位了</P>
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