{-# LANGUAGE BangPatterns , BlockArguments ,FlexibleContexts ,FlexibleInstances ,OverloadedStrings ,TypeApplications ,MultiParamTypeClasses ,TupleSections #-} {-# OPTIONS_GHC -Wno-missing-methods #-} {-# OPTIONS_GHC -Wno-unrecognised-pragmas #-} import Control.Monad (replicateM,forM_,when,(<=<)) import Data.Maybe (fromJust) import Data.Array.IO(IOUArray,IOArray) import Data.Array.Unboxed(UArray,Ix) import qualified Data.Array.MArray as MA import qualified Data.Array.IArray as A import qualified Data.ByteString.Char8 as BS import qualified Data.Set as S import qualified Data.Map as Map import qualified Data.Sequence as Seq import Data.STRef import Data.Array.ST import Control.Monad.ST import qualified Data.IntMap as IM import qualified Data.Map.Strict as Map import Data.List(sort, intersperse,permutations) import Control.Monad.State import qualified Data.Foldable as F import Data.IORef import Data.Foldable (traverse_) -- ================================================================== powMod :: Int -> Int -> Int -> Int powMod a n m = go a n where go !x !n' | n' == 0 = 1 | even n' = let !y = go x (n' `div` 2) in y*y `mod` m | otherwise = let !y = go x (n' - 1) in x*y `mod` m main :: IO () main = do [a, n]<- input @[Int] let m = 998244353 in print m >> print (powMod a n m) -- ================================================================== swapArray :: (MA.MArray a e m, Ix i) => a i e -> i -> i -> m () swapArray a i j = do ai <- MA.readArray a i aj <- MA.readArray a j MA.writeArray a i aj MA.writeArray a j ai initUG :: Int -> [[Int]] -> A.Array Int [Int] initUG n xs = A.accumArray (flip (:)) [] (0, n-1) $ concatMap (\[a, b] -> [(a, b), (b, a)]) xs seqfront :: Seq.ViewL a -> a seqfront(a Seq.:< b) = a seqpop :: Seq.ViewL a -> Seq.Seq a seqpop(a Seq.:< b) = b modifyArray :: (MA.MArray a e m, Ix i) => a i e -> i -> (e -> e) -> m () modifyArray !a !i !f = MA.writeArray a i . f =<< MA.readArray a i {-# INLINE modifyArray #-} type Bs = BS.ByteString type Height = Int type Width = Int type MutableArray2D any = IOUArray (Height,Width) any type Array2D any = UArray (Height, Width) any -- 初期化DP配列==================================================== class DPArray a where initDP :: Height -> Width -> a -> IO(MutableArray2D a) instance DPArray Int where initDP = ((MA.newArray . ((0, 0) ,)) .) . (. subtract 1) . (,) . subtract 1 instance DPArray Double where initDP = ((MA.newArray . ((0, 0) ,)) .) . (. subtract 1) . (,) . subtract 1 instance DPArray Bool where initDP = ((MA.newArray . ((0, 0) ,)) .) . (. subtract 1) . (,) . subtract 1 -- ================================================================= -- 入力 ===================================================================================================================================================== class (Read a) => Input a where read' :: BS.ByteString -> a readArray2D :: Height -> Width -> BS.ByteString -> a input :: Input a => IO a input = read' <$> BS.getLine inputs :: Input a => IO a inputs = read' <$> BS.getContents inputArray :: Input a => Int -> Int -> IO a inputArray = flip flip BS.getContents . ((<$>) .) . readArray2D instance Input Bs where read' = id instance Input Int where read' = fst . fromJust . BS.readInt instance Input Integer where read' = (read @Integer) . BS.unpack instance Input Double where read' = read . BS.unpack instance Input [Bs] where read' = BS.words instance Input [Int] where read' = map (fst . fromJust . BS.readInt) . BS.words instance Input [Double] where read' = map ((read @Double) . BS.unpack) . BS.words instance Input [(Int, Bs)] where read' = map ((\[a, b] -> (fst (fromJust (BS.readInt a)), b)) . BS.words) . BS.lines instance Input [(Bs, Int)] where read' = map ((\[a, b] -> (a, fst (fromJust (BS.readInt b)))) . BS.words) . BS.lines instance Input [[Bs]] where read' = map BS.words . BS.lines instance Input [[Int]] where read' = map (map (fst . fromJust . BS.readInt) . BS.words) . BS.lines instance Input [[Double]] where read' = map (map ( (read @Double) . BS.unpack) . BS.words) . BS.lines instance Input (Array2D Int) where readArray2D = flip flip ((map (fst . fromJust . BS.readInt) . BS.words) <=< BS.lines) . (((.) . A.listArray . ((0, 0) ,)) .) . (. subtract 1) . (,) . subtract 1 instance Input (Array2D Double) where readArray2D height width = A.listArray ((0, 0), (height - 1, width - 1)) . concatMap (map ((read @Double) . BS.unpack) . BS.words) . BS.lines instance Input (Array2D Char) where readArray2D = flip flip (BS.unpack <=< BS.lines) . (((.) . A.listArray . ((0, 0) ,)) .) . (. subtract 1) . (,) . subtract 1 -- ============================================================================================================================================================