Изменения

digraph G { a [label="" height=0.3 width=0.3]; b [label="u" height=0.3 width=0.3 style=filled]; c [label="4" height=0.3 width=0.3 style=filled]; d [label="3" height=0.3 width=0.3 style=filled]; e [label="" height=0.3 width=0.3 style=filled]; f [label="v" height=0.3 width=0.3]; g [label="1" height=0.3 width=0.3]; h [label="2" height=0.3 width=0.3]; a -> c [dir=none]; b -> c [dir=none]; c -> d -> e [dir=none style=bold]; d -> h [dir=none]; f -> g -> h [dir=none style=bold]; b -> f [dir=none style=dashed]; a -> b [style=invis] }