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 (9.14.1) |
| 結果 |
AC
|
| 実行時間 | 2 ms / 5,000 ms |
| コード長 | 252 bytes |
| 記録 | |
| コンパイル時間 | 4,681 ms |
| コンパイル使用メモリ | 196,992 KB |
| 実行使用メモリ | 6,400 KB |
| 最終ジャッジ日時 | 2026-05-29 04:48:41 |
| 合計ジャッジ時間 | 5,135 ms |
|
ジャッジサーバーID （参考情報） |
judge2_0 / judge3_1 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 10 |
コンパイルメッセージ
Loaded package environment from /home/judge/.ghc/x86_64-linux-9.14.1/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.Internal.List):
"This is a partial function, it throws an error on empty lists. Use pattern matching, 'Data.List.uncons' or 'Data.Maybe.listToMaybe' 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.Internal.List):
"This is a partial function, it throws an error on empty lists. Use pattern matching, 'Data.List.uncons' or 'Data.Maybe.listToMaybe' 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.Internal.List):
"This is a partial function, it throws an error on empty lists. Use pattern matching, 'Data.List.uncons' or 'Data.Maybe.listToMaybe' 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
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