20/10/01 11:20:33.49 iee67Noq.net
>>614
Haskell
astr m n = "A(" ++ m ++ "," ++ n ++ ")"
ack' 0 n = (n+1, [astr (show 0) (show n), (show $ n+1)])
ack' m 0 = let
(val, ss) = ack' (m-1) 1
in (val, (astr (show m) (show 0)) : ss)
ack' m n = let
(val1, ss1) = ack' m (n-1)
(val2, ss2) = ack' (m-1) val1
ss = [astr (show $ m-1) s | s <-ss1] ++ (tail ss2)
in (val2, (astr (show m) (show n)):ss)
ack m n = map (++"\n") $ snd $ ack' m n
main = do
[x,y]<-(return.(map read).words)=<<getLine
mapM_ putStr $ ack x y