data/flow/graph_structure/easy/graph123.txt

7 16
0 3 2
0 6 10
1 2 2
1 5 9
1 4 8
2 5 4
2 0 3
2 6 3
3 1 7
5 3 6
5 6 6
6 2 3
6 1 5
6 0 2
6 3 10
6 4 1
6 3
18