c

c        This is a simple example file to demonstrate the

c     DIMACS input file format for minimum-cost flow problems.

c 

c problem line :

p min 4 5

c

c node descriptor lines :

n 1 4

n 4 -4

c

c arc descriptor lines :

a 1 2 0 4 2

a 1 3 0 2 2

a 2 3 0 2 1

a 2 4 0 3 3

a 3 4 0 5 1