问题描述：
lingo 运筹学整数规划问题
sets:
students/s1..s6/:cost;
days/d1..d5/;
links(students,days):time,a,y;
endsets
min=@sum(links:cost*time);
(2*y(i,j))=7);
@for(students(i):@sum(days(j):time(i,j))=14);
@for(days(j):@sum(students(i):y(i,j))
sets:
students/s1..s6/:cost;
days/d1..d5/;
links(students,days):time,a,y;
endsets
min=@sum(links:cost*time);
(2*y(i,j))=7);
@for(students(i):@sum(days(j):time(i,j))=14);
@for(days(j):@sum(students(i):y(i,j))
问题解答：
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