路径编号
具体路径
L 1
P → v 1 → v 3 → Q
L 2
P → v 1 → v 4 → v 6 → v 3 → Q
L 3
P → v 2 → v 1 → v 3 → Q
L 4
P → v 2 → v 1 → v 4 → v 6 → v 3 → Q
L 5
P → v 2 → v 5 → v 4 → v 6 → v 3 → Q
L 6
P → v 2 → v 5 → v 7 → v 6 → v 3 → Q
L 7
P → v 2 → v 5 → v 7 → v 8 → Q