RosettaCodeData/Task/Floyd-Warshall-algorithm/J/floyd-warshall-algorithm-5.j

   task graph
pair  dist   path
1->2   _1    1->3->4->2
1->3   _2    1->3
1->4    0    1->3->4
2->1    4    2->1
2->3    2    2->1->3
2->4    4    2->1->3->4
3->1    5    3->4->2->1
3->2    1    3->4->2
3->4    2    3->4
4->1    3    4->2->1
4->2   _1    4->2
4->3    1    4->2->1->3