結果

問題 No.486 3 Straight Win(3連勝)
ユーザー はむ吉🐹
提出日時 2017-02-26 13:08:05
言語 Haskell
(9.10.1)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 439 bytes
コンパイル時間 1,921 ms
コンパイル使用メモリ 173,440 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-06-26 04:08:40
合計ジャッジ時間 2,783 ms
ジャッジサーバーID
(参考情報)
judge3 / 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
other AC * 28
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:7:24: 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."
  |
7 | freq = map (length &&& head) . group
  |                        ^^^^

Main.hs:14:22: 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."
   |
14 |             | (snd . head $ xs) == 'O' = East
   |                      ^^^^
[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.Arrow ((&&&))
import Data.List (group)
data Winner = East | West | NA deriving (Eq, Ord, Show, Read)
freq :: Ord a => [a] -> [(Int, a)]
freq = map (length &&& head) . group
judge :: String -> Winner
judge = f . dropWhile (\x -> fst x < 3) . freq
where
f xs
| null xs = NA
| (snd . head $ xs) == 'O' = East
| otherwise = West
main :: IO ()
main = print . judge =<< getLine
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