c 9th DIMACS Implementation Challenge: Shortest Paths c http://www.dis.uniroma1.it/~challenge9 c Sample node coords aux file c p sp co 6 c coordinates of 6 nodes c v 1 10 20 c node with id 1 has coordinate (10,20) in the plane c v 2 20 20 v 3 30 20 v 4 10 40 v 5 20 40 v 6 30 40