結果

問題 No.185 和風
コンテスト
ユーザー はむ吉🐹
提出日時 2016-06-06 22:35:42
言語 Haskell
(9.10.1)
結果
AC  
実行時間 3 ms / 1,000 ms
コード長 697 bytes
コンパイル時間 3,919 ms
コンパイル使用メモリ 182,524 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-10-08 16:46:34
合計ジャッジ時間 4,523 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge2
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
other AC * 7
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:7:25: 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 | allTheSame xs = all (== head xs) $ tail xs
  |                         ^^^^

Main.hs:7:36: 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."
  |
7 | allTheSame xs = all (== head xs) $ tail xs
  |                                    ^^^^

Main.hs:15:16: 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."
   |
15 |         ans1 = head anss
   |                ^^^^
[2 of 2] Linking a.out

ソースコード

diff # 

import qualified Data.ByteString.Lazy.Char8 as LC
import Data.Maybe (fromJust)

type Equation a = (a, a)

allTheSame :: (Eq a) => [a] -> Bool
allTheSame xs = all (== head xs) $ tail xs

solve :: Integral a => [Equation a] -> a
solve xs
    | allTheSame anss && ans1 > 0 = ans1
    | otherwise = -1
    where
        anss = fmap (\(x, y) -> y - x) xs
        ans1 = head anss

tuplify2 :: [a] -> (a, a)
tuplify2 [x, y] = (x, y)
tuplify2 _ = error "the length of the list must be two"

unsafeReadInt :: LC.ByteString -> Int
unsafeReadInt = fst . fromJust . LC.readInt

main :: IO ()
main = getLine >> LC.getContents >>= print . solve .
    fmap (tuplify2 . fmap unsafeReadInt . LC.words) . LC.lines
0