LINGO求解错误MODEL:SETS:CITY/1..5/:U;LINK(CITY,CITY):COST,X;ENDS

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LINGO求解错误
MODEL:
SETS:
CITY/1..5/:U;
LINK(CITY,CITY):COST,
X;
ENDSETS
DATA:
COST= 0 120 250 330 210
120 0 98 350 225
250 98 0 520 430
330 350 520 0 270
210 225 430 270 0

ENDDATA
N=@SIZE(CITY);
MIN=@SUM(LINK:COST*X);
@FOR(CITY(K) :
@SUM(CITY(I)|I #NE# K:X(I,K))=1;
@SUM(CITY(J)|J #NE# K:X(K,J))=1;
@FOR(CITY(J)|J #GT# 1 #AND# J #NE# K:
U(J)>=U(K)+X(K,J)-(N-2)*(1-X(K,J))+(N-3)*X(J,K)););
@FOR(LINK:@BIN(X));
@FOR(CITY(K)|K #GT# 1:
U(K)<=N-1-(N-2)*X(1,K);
U(K)>=1+(N-2)*X(K,1));
END

cost的最后要加分号

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