80 lines
3.2 KiB
Haskell
80 lines
3.2 KiB
Haskell
import Data.List.Split
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import qualified Data.List as L
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import Data.Vector as V
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import Data.Char
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data OutAction = Continue | Output | Halt deriving (Enum, Eq, Show)
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type Tape = Vector Int
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type TapeSection = Vector Int
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type TuringMachine = (Tape,Int)
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main = do
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content <- readFile "input"
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let tape = fromList $ L.concatMap (L.map read . splitOn ",") (lines content)
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print $ findMax tape [0..4]
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print $ findMax tape [5..9]
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findMax :: Tape -> [Int] -> Int
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findMax tape range = L.maximum [runAmps tape xs | xs <- L.permutations range]
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runAmps :: Tape -> [Int] -> Int
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runAmps tape intseq = L.head $ runAmps' tms intseq [0]
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where tms = L.replicate 5 (tape,0)
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runAmps' :: [TuringMachine] -> [Int] -> [Int] -> [Int]
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runAmps' ((t,p):tms) intseq prev =
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if halt == Halt then prev else
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runAmps' (tms L.++ [tm_new]) tailseq tm_out
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where (tm_new,tm_in,tm_out,halt) = execSteps ((t,p),xprev,[],Continue)
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tailseq = if L.null intseq then [] else L.tail intseq
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xprev = if L.null intseq then prev else L.head intseq:prev
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opLength :: Int -> Int
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opLength x
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| n`L.elem`"1278"=4
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| n`L.elem`"56"=3
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| n`L.elem`"34"=2
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| otherwise=1
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where n = L.last $ show x
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parseModes :: String -> [Bool]
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parseModes m = L.replicate (3 - L.length l) False L.++ l
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where l = L.map (toEnum . digitToInt) m
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paramChange :: [Bool] -> TapeSection -> Tape -> TapeSection
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paramChange m opvec t = imap f (V.tail opvec)
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where f i a = if L.reverse m !! i then a else t ! a
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getOpModes :: TapeSection -> (String, [Bool])
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getOpModes opvec = (op_dedup,parsed_modes)
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where (op,modes) = L.splitAt 2 $ L.reverse $ show $ opvec ! 0
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parsed_modes = parseModes $ L.reverse modes
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op_dedup = if L.last op == '0' then [L.head op] else op
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step :: TapeSection -> (TuringMachine, [Int], [Int]) -> (TuringMachine, OutAction, [Int], [Int])
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step opvec ((t,p),input,val)
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| op=="1" = (tm_binop (+),Continue,input,val)
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| op=="2" = (tm_binop (*),Continue,input,val)
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| op=="3" = (new_tm t (L.head input),Continue,L.tail input,val)
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| op=="4" = ((t,p),Output,input,V.last params:val)
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| op=="5" = ((t, if params ! 0/=0 then params ! 1 else p),Continue,input,val)
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| op=="6" = ((t, if params ! 0==0 then params ! 1 else p),Continue,input,val)
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| op=="7" = (new_tm t (if (params ! 0)<(params ! 1)
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then 1 else 0),Continue,input,val)
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| op=="8" = (new_tm t (if (params ! 0)==(params ! 1)
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then 1 else 0),Continue,input,val)
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| op=="99" = ((t,p),Halt,input,val)
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where (op,m) = getOpModes opvec
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params = paramChange m opvec t
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tm_binop x = new_tm t ((params ! 0) `x` (params ! 1))
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new_tm t x = (t // [(V.last opvec, x)],p)
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execSteps :: (TuringMachine, [Int], [Int], OutAction) -> (TuringMachine, [Int], [Int], OutAction)
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execSteps ((t,p),input,output,halt) =
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let command_length = opLength $ t ! p
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opvec = slice p command_length t
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((t_new,p_new),cond,input_new,output_new) =
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step opvec ((t,p+command_length),input,output) in
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if cond `L.elem` [Output, Halt] then ((t_new,p_new),input_new,output_new,cond)
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else execSteps ((t_new,p_new),input_new,output_new,cond)
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