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 |
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| 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)