結果
| 問題 |
No.45 回転寿司
|
| ユーザー |
|
| 提出日時 | 2023-05-20 11:08:30 |
| 言語 | Haskell (9.10.1) |
| 結果 |
AC
|
| 実行時間 | 11 ms / 5,000 ms |
| コード長 | 668 bytes |
| コンパイル時間 | 9,956 ms |
| コンパイル使用メモリ | 169,472 KB |
| 実行使用メモリ | 8,320 KB |
| 最終ジャッジ日時 | 2024-12-21 09:40:41 |
| 合計ジャッジ時間 | 10,450 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 30 |
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:25:22: 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."
|
25 | n :: Int <- read . head <$> prompt
| ^^^^
[2 of 2] Linking a.out
ソースコード
module Main where
split :: String -> [String]
split = go ("", [])
where
go :: (String, [String]) -> String -> [String]
go (a, acc) "" = acc <> [a]
go (a, acc) (' ' : xs) = go ("", acc <> [a]) xs
go (a, acc) (x : xs) = go (a <> [x], acc) xs
prompt :: IO [String]
prompt = do split <$> getLine
solve :: Int -> [Int] -> Int
solve n (v : vs) = go 1 (0, v) vs
where
go :: Int -> (Int, Int) -> [Int] -> Int
go _ (_, r) [] = r
go i (a, b) (x : xs)
| i == n = b
| otherwise = go (i + 1) (b, max (a + x) b) xs
main :: IO ()
main = do
n :: Int <- read . head <$> prompt
vs :: [Int] <- map read <$> prompt
print $ solve n vs