結果
| 問題 |
No.486 3 Straight Win(3連勝)
|
| コンテスト | |
| 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 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 28 |
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
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
はむ吉🐹