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