iterate

iterate([], _, Table) ->
  Table;

iterate([{_, inf, _}|_], _, Table) ->
  Table;

iterate([{Node, Len, Gateway}|T], Map, Table) ->

  Reachables = map:reachable(Node, Map),
  [H|Rest] = pre_update(Reachables, Len, Gateway, [{Node, Len, Gateway}|T]),
  iterate(Rest, Map, [{Node, Gateway}|Table]).


pre_update([], _, _, Sorted) ->
  Sorted;

pre_update([H|T], Len, Gateway, Sorted) ->
  pre_update(T, Len, Gateway, update(H, Len, Gateway, Sorted)).