結果
| 問題 | No.707 書道 | 
| コンテスト | |
| ユーザー |  | 
| 提出日時 | 2019-03-13 19:10:40 | 
| 言語 | Haskell (9.10.1) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 24 ms / 2,000 ms | 
| コード長 | 1,071 bytes | 
| コンパイル時間 | 7,895 ms | 
| コンパイル使用メモリ | 174,592 KB | 
| 実行使用メモリ | 7,808 KB | 
| 最終ジャッジ日時 | 2024-06-23 20:52:22 | 
| 合計ジャッジ時間 | 6,015 ms | 
| ジャッジサーバーID (参考情報) | judge5 / judge3 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 3 | 
| other | AC * 6 | 
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:33:13: 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."
   |
33 |     print $ head $ sort $ solve (getWaku w h) (getMasu 0 w h ps)
   |             ^^^^
[2 of 2] Linking a.out
            
            ソースコード
import Control.Monad (replicateM)
import Data.List (sort)
distance :: (Int, Int) -> (Int, Int) -> Double
distance a b = sqrt $ distance2 a b
distance2 :: (Int, Int) -> (Int, Int) -> Double
distance2 a b = x2 + y2 where
    x2 = (fromIntegral (fst a) - fromIntegral (fst b)) ** 2
    y2 = (fromIntegral (snd a) - fromIntegral (snd b)) ** 2
solve :: [(Int, Int)] -> [(Int, Int)] -> [Double]
solve [] _ = []
solve (w:ws) ms = d : solve ws ms where
    d = foldr (\x y -> distance w x + y) 0.0 ms
getWaku w h = [ (x, 0) | x <- [1..w] ] ++
              [ (0, y) | y <- [1..h] ] ++
              [ (x, h + 1) | x <- [1..w] ] ++
              [ (w + 1, y) | y <- [1..h] ]
getMasu _ _ _ [] = []
getMasu i w h (c:ps)
    | c == '1'      = masu : getMasu (i + 1) w h ps
    | otherwise     = getMasu (i + 1) w h ps
    where
        (d, m) = divMod i w
        masu = (m + 1, d + 1)
main = do
    [h, w] <- map read . words <$> getLine :: IO [Int]
    ps <- foldr (++) [] <$> replicateM h getLine :: IO String
    print $ head $ sort $ solve (getWaku w h) (getMasu 0 w h ps)
            
            
            
        