Originally posted by: skyskyhuanghuang

I have written like this:

maximize

sum(i in 1..M)

((i+sum(j in 1..M) j)+sum(n in 1.M) n);

but  variables like j and n are conditional.(j!=i , n!=i,n!=j).How can i express it?

Hi

int M=3;

int res=sum(i,j,n in 1..M:j!=i && n!=i && n!=j) (i+j+n);

execute
{
writeln("res=",res);
}

regards