結果

問題 No.99 ジャンピング駒
ユーザー こまるこまる
提出日時 2020-11-04 22:05:10
言語 Haskell
(9.10.1)
結果
AC  
実行時間 15 ms / 5,000 ms
コード長 1,361 bytes
コンパイル時間 10,684 ms
コンパイル使用メモリ 229,524 KB
実行使用メモリ 12,672 KB
最終ジャッジ日時 2024-07-22 10:26:09
合計ジャッジ時間 9,145 ms
ジャッジサーバーID
(参考情報)
judge2 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
other AC * 6
権限があれば一括ダウンロードができます
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 )
[2 of 2] Linking a.out

ソースコード

diff #
プレゼンテーションモードにする

{-# LANGUAGE BangPatterns #-}
import Control.Monad.State
import Data.Char
import Data.Coerce
import Data.IORef
import Data.Word
import qualified Data.ByteString as BS
import qualified Data.ByteString.Char8 as BSC8
import qualified Data.Vector.Fusion.Stream.Monadic as VFSM
import qualified Data.Vector.Unboxed as VU
main :: IO ()
main = do
n <- readLn :: IO Int
xs <- seqInput n
a <- newIORef (0 :: Int)
rep n $ \i -> if odd (xs VU.! i) then modifyIORef' a succ else modifyIORef' a pred
print . abs =<< readIORef a
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 #-}
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 #-}
seqInput :: Int -> IO (VU.Vector Int)
seqInput n = VU.unfoldrN n (runCParser int) <$> BSC8.getLine
{-# INLINE seqInput #-}
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