結果

問題 No.273 回文分解
ユーザー ducktail
提出日時 2018-08-07 14:29:32
言語 Haskell
(9.10.1)
結果
AC  
実行時間 3 ms / 2,000 ms
コード長 389 bytes
コンパイル時間 7,981 ms
コンパイル使用メモリ 173,640 KB
実行使用メモリ 5,376 KB
最終ジャッジ日時 2024-09-19 18:25:40
合計ジャッジ時間 8,940 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge4
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:9:18: 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."
  |
9 | solve = length . head . filter isPal . tail . sortBy (flip compare `on` length) . segments
  |                  ^^^^

Main.hs:9:40: 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."
  |
9 | solve = length . head . filter isPal . tail . sortBy (flip compare `on` length) . segments
  |                                        ^^^^
[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

import Control.Applicative ((<$>))
import Data.List (sortBy)
import Data.Function (on)
main :: IO ()
main = solve <$> getLine >>= print
solve :: String -> Int
solve = length . head . filter isPal . tail . sortBy (flip compare `on` length) . segments
isPal :: Eq a => [a] -> Bool
isPal = reverse >>= (==)
segments :: [a] -> [[a]]
segments = concat . scanr (\x y -> [x] : map (x:) y) []
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