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     8 using std::cout;  | 
     8 using std::cout;  | 
     9 using std::endl;  | 
     9 using std::endl;  | 
    10 using namespace lemon;  | 
    10 using namespace lemon;  | 
    11   | 
    11   | 
    12 /*  | 
    12 /*  | 
    13   for n=3,4 , the program is very fast  | 
    13   On an 1537Mhz PC, the run times with   | 
    14   for n=5, with glpk, the run takes hours  | 
    14   glpk are the following.  | 
         | 
    15   for n=3,4, some secondes  | 
         | 
    16   for n=5, 25 hours  | 
    15  */  | 
    17  */  | 
    16   | 
    18   | 
    17 int main(int, char **) { | 
    19 int main(int, char **) { | 
    18   const int n=4;  | 
    20   const int n=4;  | 
    19   const double row_sum=(1.0+n*n)*n/2;  | 
    21   const double row_sum=(1.0+n*n)*n/2;  |