[galib] Problem with program's structure

[assia]

Hi,
is it any body, who can help me to identify my program's problem, I personalize exo26 for my case, and all things seem OK, but I can't find a good solution.
My problem is about finding a set of rectangles that dont overlap like this : 
                        
           1           
                 
      2           
                 
             4     
                 
                     
             3        

 
but all solutions I am finding are like this

             1           
                       
                      2 
                        
                   
                   
                       3     
                     
               4           

My fitness take into acount the number of intersections and the intersection's surface like this :

A = 100 * ( 1 - (number of Intersections / 3)
 
 B = 100 * (1 - (surface of  intersection / Surface of rectangle))
 
fitness =  x * A + ( 1-x ) * B
I can send you my code, if any person suggests to help me. I feel in dead end.

Thanks advance.
Assia. 

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