結果

問題 No.40 多項式の割り算
ユーザー aimy
提出日時 2017-08-27 13:27:00
言語 Haskell
(9.10.1)
結果
AC  
実行時間 29 ms / 5,000 ms
コード長 396 bytes
コンパイル時間 9,187 ms
コンパイル使用メモリ 171,264 KB
実行使用メモリ 11,904 KB
最終ジャッジ日時 2024-11-06 06:40:25
合計ジャッジ時間 7,849 ms
ジャッジサーバーID
(参考情報)
judge5 / 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
sample AC * 3
other AC * 32
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 )

Main.hs:13:5: warning: [GHC-63394] [-Wx-partial]
    In the use of ‘head’
    (imported from Prelude, but defined in GHC.List):
    "This is a partial function, it throws an error on empty lists. Use pattern matching or Data.List.uncons instead. Consider refactoring to use Data.List.NonEmpty."
   |
13 |   | head bs == 0 = poly (d - 1) (tail bs)
   |     ^^^^

Main.hs:13:34: warning: [GHC-63394] [-Wx-partial]
    In the use of ‘tail’
    (imported from Prelude, but defined in GHC.List):
    "This is a partial function, it throws an error on empty lists. Replace it with drop 1, or use pattern matching or Data.List.uncons instead. Consider refactoring to use Data.List.NonEmpty."
   |
13 |   | head bs == 0 = poly (d - 1) (tail bs)
   |                                  ^^^^
[2 of 2] Linking a.out

ソースコード

diff #

main = do
  d <- readLn
  bs <- map read . words <$> getLine
  let r = poly d (reverse bs)
  let n = length r - 1
  print n
  putStrLn $ unwords (map show r)

poly d bs
  | all (== 0) bs = [0]
  | d == 3 && bs!!0 == bs!!2 && bs!!1 == 0 = [0]
  | d < 3 = reverse (dropWhile (== 0) bs)
  | head bs == 0 = poly (d - 1) (tail bs)
  | otherwise = let (b1:b2:b3:br) = bs in poly (d - 1) (b2:(b3+b1):br)
0