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 |  くれちー | 
| 提出日時 | 2017-03-15 23:42:08 | 
| 言語 | Haskell (9.10.1) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 10 ms / 5,000 ms | 
| コード長 | 439 bytes | 
| コンパイル時間 | 1,688 ms | 
| コンパイル使用メモリ | 174,080 KB | 
| 実行使用メモリ | 8,064 KB | 
| 最終ジャッジ日時 | 2024-09-22 05:29:29 | 
| 合計ジャッジ時間 | 2,260 ms | 
| ジャッジサーバーID (参考情報) | judge4 / judge2 | 
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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:7:28: 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 |     | x == True  = solve1 (tail s) (s' ++ [head s]) xs
  |                            ^^^^
Main.hs:7:44: 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 |     | x == True  = solve1 (tail s) (s' ++ [head s]) xs
  |                                            ^^^^
[2 of 2] Linking a.out
            
            ソースコード
import Control.Monad (replicateM)
import Data.List (nub)
solve1 :: String -> String -> [Bool] -> String
solve1 s s' (x : []) = s' ++ s
solve1 s s' (x : xs)
    | x == True  = solve1 (tail s) (s' ++ [head s]) xs
    | x == False = solve1 (init s) (s' ++ [last s]) xs
solve2 :: Integral a => String -> a
solve2 s = fromIntegral . length . nub . map (solve1 s "")
    $ replicateM (length s) [True, False]
main = print . solve2 =<< getLine
            
            
            
        