data/hamilton/graph_structure/hard/graph1.txt

11 28
8 5
8 10
3 9
0 2
2 6
4 9
9 10
8 9
9 7
5 10
7 4
8 6
9 6
3 7
0 1
3 10
8 2
8 3
6 0
4 1
9 2
6 7
4 10
7 5
5 6
1 7
8 0
4 0