#
#  another simple route not used by Wikipedia!
#

# Node   neighbours[cost]

  a      b:2  c:4  f:5
  b      a:2  c:1
  c      b:1  a:4  d:1
  d      c:1  e:2
  e      d:2  f:1
  f      e:1  a:5

find a -> f

#  answer is   a -> f total 5