On Mon, Mar 22, 2010 at 11:02:32AM +0100, Johannes Waldmann wrote:
> Dear all, there is this neat "one-line" BFS implementation
>
> bfs :: Eq a
> => ( a -> [a] ) -> a -> [a]
> bfs next start =
> let xs = nub $ start : ( xs >>= next )
> in xs
>
> but it has a problem: it only works fo
Dear all, there is this neat "one-line" BFS implementation
bfs :: Eq a
=> ( a -> [a] ) -> a -> [a]
bfs next start =
let xs = nub $ start : ( xs >>= next )
in xs
but it has a problem: it only works for infinite graphs. This is fine:
take 20 $ bfs ( \ x -> [2*x, x+1] ) 1
but this is
