Graph1
19
-1 10 3 2
-2 7 3
-3 19
-4 19 14 13
-5 19 11 6
-6 19 8
-7 9 8
-8 9
-9 12
-10 12 11
-11 12
-13 17 14
-14 15
-15 19 16
-16 18 17
-17 18
-18 19
0