結果

問題 No.49 算数の宿題
コンテスト
ユーザー aimy
提出日時 2017-04-21 21:16:44
言語 Haskell
(9.10.1)
結果
AC  
実行時間 2 ms / 5,000 ms
コード長 252 bytes
コンパイル時間 2,639 ms
コンパイル使用メモリ 176,384 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-12-23 01:56:48
合計ジャッジ時間 3,251 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
other AC * 10
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:4:35: 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."
  |
4 | parse acc ('+':cs) = let (n,xs) = head (reads cs) in parse (acc*n) xs
  |                                   ^^^^

Main.hs:5:35: 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."
  |
5 | parse acc ('*':cs) = let (n,xs) = head (reads cs) in parse (acc+n) xs
  |                                   ^^^^

Main.hs:6:29: 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."
  |
6 | parse acc cs = let (n,xs) = head (reads cs) in parse n xs
  |                             ^^^^
[2 of 2] Linking a.out

ソースコード

diff # 

main = getLine >>= print . parse 0

parse acc [] = acc
parse acc ('+':cs) = let (n,xs) = head (reads cs) in parse (acc*n) xs
parse acc ('*':cs) = let (n,xs) = head (reads cs) in parse (acc+n) xs
parse acc cs = let (n,xs) = head (reads cs) in parse n xs
0