結果

問題 No.482 あなたの名は
ユーザー くれちーくれちー
提出日時 2017-02-25 02:47:02
言語 Haskell
(9.8.2)
結果
TLE  
実行時間 -
コード長 1,066 bytes
コンパイル時間 8,027 ms
コンパイル使用メモリ 170,112 KB
実行使用メモリ 175,744 KB
最終ジャッジ日時 2024-06-11 03:48:29
合計ジャッジ時間 13,250 ms
ジャッジサーバーID
(参考情報)
judge5 / judge1
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 1 ms
10,624 KB
testcase_01 AC 1 ms
5,248 KB
testcase_02 AC 2 ms
5,376 KB
testcase_03 AC 1 ms
5,376 KB
testcase_04 AC 2 ms
5,376 KB
testcase_05 AC 2 ms
5,376 KB
testcase_06 AC 2 ms
5,376 KB
testcase_07 AC 54 ms
18,944 KB
testcase_08 AC 26 ms
13,568 KB
testcase_09 AC 3 ms
5,504 KB
testcase_10 AC 20 ms
11,008 KB
testcase_11 AC 36 ms
14,080 KB
testcase_12 AC 51 ms
18,816 KB
testcase_13 AC 27 ms
13,568 KB
testcase_14 AC 18 ms
10,496 KB
testcase_15 TLE -
testcase_16 -- -
testcase_17 -- -
testcase_18 -- -
testcase_19 -- -
testcase_20 -- -
testcase_21 -- -
testcase_22 -- -
testcase_23 -- -
testcase_24 -- -
testcase_25 -- -
testcase_26 -- -
testcase_27 -- -
testcase_28 -- -
testcase_29 -- -
testcase_30 -- -
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:9:38: 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."
  |
9 |         t2 = splitAt (pred $ j - i) (tail . snd $ t1)
  |                                      ^^^^

Main.hs:10:14: 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."
   |
10 |         t3 = tail . snd $ t2
   |              ^^^^
[2 of 2] Linking a.out

ソースコード

diff #

import Data.List (findIndex)

swap :: [a] -> Int -> Int -> [a]
swap xs a b = fst t1 ++ [xs !! pred j] ++ fst t2 ++ [xs !! pred i] ++ t3
    where
        i  = min a b
        j  = max a b
        t1 = splitAt (pred i) xs
        t2 = splitAt (pred $ j - i) (tail . snd $ t1)
        t3 = tail . snd $ t2

rep :: Integral a => [Int] -> [Int] -> Int -> a -> a
rep ds idxs i cnt
    | i > length ds       = cnt
    | ds !! (pred i) == i = rep ds idxs (succ i) cnt
    | otherwise           = rep (swap ds i (idxs !! (pred i))) (swap idxs (ds !! pred i) (ds !! pred (idxs !! pred i))) (succ i) (succ cnt)

solve :: Integral a => Int -> a -> [Int] -> Bool
solve n k ds
    | cnt <= k && even (k - cnt) = True
    | otherwise                  = False
    where
        Just idxs = fmap (map succ) . sequenceA $ (\x -> findIndex (== x)) <$> [1..n] <*> pure ds
        cnt       = rep ds idxs 1 0

main = do
    [n, k] <- map read . words <$> getLine
    ds     <- map read . words <$> getLine
    putStrLn $ case solve n k ds of
        True  -> "YES"
        False -> "NO"
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