data/flow/graph_structure/easy/graph137.txt

7 15
0 2 2
0 4 6
1 5 5
1 4 7
2 6 1
2 0 2
2 3 4
3 5 9
3 0 3
3 1 5
4 5 6
4 0 6
4 3 3
5 3 6
6 0 4
1 0
9