问题描述：
LINGO程序总是有问题
model:
sets:
entrance/1/:x,y;
endsets
init:
x=0;
y=0;
endinit
[OBJ]min = ((45-x(i))^2+y(i)^2)^(1/2)+((35-x(i))^2+(100-y(i))^2)^(1/2)+((120-x(i))^2+(100-y(i))^2)^(1/2);
((45-x(i))^2+y(i)^2)^(1/2)+((35-x(i))^2+(100-y(i))^2)^(1/2)+30
model:
sets:
entrance/1/:x,y;
endsets
init:
x=0;
y=0;
endinit
[OBJ]min = ((45-x(i))^2+y(i)^2)^(1/2)+((35-x(i))^2+(100-y(i))^2)^(1/2)+((120-x(i))^2+(100-y(i))^2)^(1/2);
((45-x(i))^2+y(i)^2)^(1/2)+((35-x(i))^2+(100-y(i))^2)^(1/2)+30
问题解答：
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