結果

問題 No.77 レンガのピラミッド
ユーザー こまる
提出日時 2020-11-05 09:34:06
言語 Haskell
(9.10.1)
結果
AC  
実行時間 2 ms / 5,000 ms
コード長 1,674 bytes
コンパイル時間 5,060 ms
コンパイル使用メモリ 227,836 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-07-22 10:50:14
合計ジャッジ時間 5,878 ms
ジャッジサーバーID
(参考情報)
judge4 / judge3
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 5
other AC * 20
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
import Control.Monad.State
import Data.Char
import Data.Coerce
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
main :: IO ()
main = do
n <- readLn :: IO Int
as <- seqInput n
let s = (floor :: Double -> Int) . sqrt . fromIntegral . VU.sum $ as
let _ans = (0 :: Int)
let _now = (1 :: Int)
info <- VUM.replicate 2 (0 :: Int)
rep n $ \i -> do
if i < s
then VUM.unsafeModify info succ _now
else do
item <- VUM.unsafeRead info _now
when (item > 0) $ VUM.unsafeModify info pred _now
now <- VUM.unsafeRead info _now
VUM.unsafeModify info (+ (max 0 (as VU.! i - now))) _ans
print =<< VUM.unsafeRead info _ans
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 #-}
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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