結果

問題 No.286 Modulo Discount Store
ユーザー こまるこまる
提出日時 2020-11-04 21:04:49
言語 Haskell
(9.8.2)
結果
CE  
(最新)
AC  
(最初)
実行時間 -
コード長 2,252 bytes
コンパイル時間 423 ms
コンパイル使用メモリ 203,136 KB
最終ジャッジ日時 2024-04-27 03:31:26
合計ジャッジ時間 879 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge2
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コンパイルメッセージ
Loaded package environment from /home/judge/.ghc/x86_64-linux-9.8.2/environments/default
[1 of 2] Compiling Main             ( Main.hs, Main.o )

Main.hs:16:9: error: [GHC-87543]
    Ambiguous occurrence ‘.<<.’.
    It could refer to
       either ‘Data.Bits..<<.’,
              imported from ‘Data.Bits’ at Main.hs:6:1-26,
           or ‘Main..<<.’, defined at Main.hs:55:1.
   |
16 | inf = 1 .<<. 30 - 1
   |         ^^^^

Main.hs:23:26: error: [GHC-87543]
    Ambiguous occurrence ‘.<<.’.
    It could refer to
       either ‘Data.Bits..<<.’,
              imported from ‘Data.Bits’ at Main.hs:6:1-26,
           or ‘Main..<<.’, defined at Main.hs:55:1.
   |
23 |   ms <- VUM.unsafeNew (1 .<<. n) :: IO (VUM.IOVector Int)
   |                          ^^^^

Main.hs:24:26: error: [GHC-87543]
    Ambiguous occurrence ‘.<<.’.
    It could refer to
       either ‘Data.Bits..<<.’,
              imported from ‘Data.Bits’ at Main.hs:6:1-26,
           or ‘Main..<<.’, defined at Main.hs:55:1.
   |
24 |   dp <- VUM.replicate (1 .<<. n) inf
   |                          ^^^^

Main.hs:25:10: error: [GHC-87543]
    Ambiguous occurrence ‘.<<.’.
    It could refer to
       either ‘Data.Bits..<<.’,
              imported from ‘Data.Bits’ at Main.hs:6:1-26,
           or ‘Main..<<.’, defined at Main.hs:55:1.
   |
25 |   rep (1 .<<. n) $ \i -> do
   |          ^^^^

Main.hs:26:34: error: [GHC-87543]
    Ambiguous occurrence ‘.<<.’.
    It could refer to
       either ‘Data.Bits..<<.’,
              imported from ‘Data.Bits’ at Main.hs:6:1-26,
           or ‘Main..<<.’, defined at Main.hs:55:1.
   |
26 |     rep n $ \j -> when (i .&. (1 .<<. j) /= 0) $ VUM.unsafeModify ms (+ xs VU.! j) i
   |                                  ^^^^

Main.hs:29:10: error: [GHC-87543]
    Ambiguous occurrence ‘.<<.’.
    It could refer to
       either ‘Data.Bits..<<.’,
              imported from ‘Data.Bits’ at Main.h

ソースコード

diff # 

{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE MagicHash    #-}

import           Control.Monad
import           Control.Monad.State
import           Data.Bits
import           Data.Coerce
import           Data.Char
import           GHC.Exts
import qualified Data.ByteString.Char8             as BSC8
import qualified Data.Vector.Fusion.Stream.Monadic as VFSM
import qualified Data.Vector.Unboxed               as VU
import qualified Data.Vector.Unboxed.Mutable       as VUM

inf :: Int
inf = 1 .<<. 30 - 1
{-# INLINE inf #-}

main :: IO ()
main = do
  n <- readLn :: IO Int
  xs <- parseN1 n
  ms <- VUM.unsafeNew (1 .<<. n) :: IO (VUM.IOVector Int)
  dp <- VUM.replicate (1 .<<. n) inf
  rep (1 .<<. n) $ \i -> do
    rep n $ \j -> when (i .&. (1 .<<. j) /= 0) $ VUM.unsafeModify ms (+ xs VU.! j) i
    VUM.unsafeModify ms (`mod` 1000) i
  VUM.unsafeWrite dp 0 0
  rep (1 .<<. n) $ \i -> rep n $ \j -> do
    let next  = i .|. (1 .<<. j)
    item <- VUM.unsafeRead ms i
    let value = max 0 (xs VU.! j - item)
    dpi <- VUM.unsafeRead dp i
    VUM.unsafeModify dp (min (dpi + value)) next
  print =<< VUM.unsafeRead dp (1 .<<. n - 1)  

type CParser a = StateT BSC8.ByteString Maybe a

runCParser :: CParser a -> BSC8.ByteString -> Maybe (a, BSC8.ByteString)
runCParser = runStateT
{-# INLINE runCParser #-}

int :: CParser Int
int = coerce $ BSC8.readInt . BSC8.dropWhile isSpace
{-# INLINE int #-}

parseN1 :: Int -> IO (VU.Vector Int)
parseN1 n = VU.unfoldrN n (runCParser int) <$> BSC8.getContents
{-# INLINE parseN1 #-}

infixl 8 .<<., .>>., .>>>.
infixl 6 .^.

(.<<.) :: Bits b => b -> Int -> b
(.<<.) = unsafeShiftL
{-# INLINE (.<<.) #-}

(.>>.) :: Bits b => b -> Int -> b
(.>>.) = unsafeShiftR
{-# INLINE (.>>.) #-}

(.>>>.) :: Int -> Int -> Int
(.>>>.) (I# x#) (I# i#) = I# (uncheckedIShiftRL# x# i#)
{-# INLINE (.>>>.) #-}

(.^.) :: Bits b => b -> b -> b
(.^.)  = xor
{-# INLINE (.^.) #-}

stream :: Monad m => Int -> Int -> VFSM.Stream m Int
stream !l !r = VFSM.Stream step l
  where
    step x
      | x < r     = return $ VFSM.Yield x (x + 1)
      | otherwise = return $ VFSM.Done
    {-# INLINE [0] step #-}
{-# INLINE [1] stream #-}

rep :: Monad m => Int -> (Int -> m ()) -> m ()
rep n = flip VFSM.mapM_ (stream 0 n)
{-# INLINE rep #-}
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