結果
| 問題 |
No.52 よくある文字列の問題
|
| コンテスト | |
| ユーザー |
はむ吉🐹
|
| 提出日時 | 2015-10-27 13:33:33 |
| 言語 | Haskell (9.10.1) |
| 結果 |
AC
|
| 実行時間 | 5 ms / 5,000 ms |
| コード長 | 600 bytes |
| コンパイル時間 | 2,642 ms |
| コンパイル使用メモリ | 172,544 KB |
| 実行使用メモリ | 6,944 KB |
| 最終ジャッジ日時 | 2024-09-22 05:23:51 |
| 合計ジャッジ時間 | 2,557 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 |
|---|---|
| other | AC * 11 |
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:7:27: 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."
|
7 | (sresh, snewh) = (tail sres, snew ++ [head sres])
| ^^^^
Main.hs:7:47: 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."
|
7 | (sresh, snewh) = (tail sres, snew ++ [head sres])
| ^^^^
[2 of 2] Linking a.out
ソースコード
import Data.List (nub)
takeChar :: (String, String) -> [(String, String)]
takeChar ([], snew) = [([], snew)]
takeChar (sres, snew) = [(sresh, snewh), (sresl, snewl)]
where
(sresh, snewh) = (tail sres, snew ++ [head sres])
(sresl, snewl) = (init sres, snew ++ [last sres])
mapTakeChar :: [(String, String)] -> [(String, String)]
mapTakeChar ps = concat $ map takeChar ps
countPossibleStrings :: String -> Int
countPossibleStrings s =
length $ nub $ map snd $ foldr (const mapTakeChar) [(s, [])] [1 .. length s]
main :: IO ()
main = print . countPossibleStrings =<< getLine
はむ吉🐹