8
undirected
weighted
a b c d e f g z
a b 30
a g 10
a c 20
b e 10
b d 10
b c 20
c d 20
c g 30
d e 10
d f 5
d g 5
e f 5
e z 10
f g 10
f z 30
g z 20
# graph is from https://i.stack.imgur.com/cDSvY.png
# was used as example graph to look at Dijkstra's algorithm in class
#  on Nov 28, 2017.