[FlopCpp] I've a problem with Flopc++

[Andrea Rossi]

Hello,
I'm a italian student and I'm coding a project for University Logistic course.
My problem is how code the attached constraint (constraint.jpg) of my logistic model in Flopc++ .I have written this code.
    MP_set Levels(n);
    MP_set Sheets(n);
    MP_binary_variable y(Sheets);
    MP_binary_variable x(Levels, Sheets);
    MP_index i, j, s;
    MP_subset<2> ls ( Levels, Sheets );
    
    MP_constraint cTwo( Sheets );
    cTwo( Sheets ) =
         sum( ls(i, j).such_that( j > i ), x(i, j)) + y( Sheets ) == 1;

Thank you.

 		 	   		  
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