結果
| 問題 | No.366 ロボットソート | 
| コンテスト | |
| ユーザー |  | 
| 提出日時 | 2018-05-29 12:37:03 | 
| 言語 | Haskell (9.10.1) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 10 ms / 2,000 ms | 
| コード長 | 724 bytes | 
| コンパイル時間 | 5,711 ms | 
| コンパイル使用メモリ | 171,520 KB | 
| 実行使用メモリ | 8,448 KB | 
| 最終ジャッジ日時 | 2024-06-30 08:00:45 | 
| 合計ジャッジ時間 | 6,507 ms | 
| ジャッジサーバーID (参考情報) | judge3 / judge2 | 
(要ログイン)
| ファイルパターン | 結果 | 
|---|---|
| other | AC * 23 | 
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:21:37: 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."
   |
21 | isSorted xs = and $ zipWith (<) xs (tail xs)
   |                                     ^^^^
[2 of 2] Linking a.out
            
            ソースコード
import Control.Applicative ((<$>), (<*>))
import Data.List (transpose, foldl', sort)
import Data.List.Split (chunksOf)
main :: IO ()
main = solve <$> f <*> f >>= print
  where f = map read <$> words <$> getLine
solve :: [Int] -> [Int] -> Int
solve [_, k] = g . foldr f (0, []) . transpose . chunksOf k
  where f xs (ct, ls) = let (ct', ls') = (swapCount xs, sort xs)
                        in (ct + ct', ls' : ls)
        g (ct, xs) | (isSorted . concat . transpose) xs = ct
                   | otherwise = -1
swapCount = fst . foldl' f (0, [])
  where f (ct, ys) x = let ct' = length . filter (x<) $ ys
                       in (ct + ct', x:ys)
isSorted :: [Int] -> Bool
isSorted xs = and $ zipWith (<) xs (tail xs)
            
            
            
        