結果
| 問題 | No.123 カードシャッフル |
| コンテスト | |
| ユーザー |
tottoripaper
|
| 提出日時 | 2015-03-03 19:22:29 |
| 言語 | Haskell (9.14.1) |
| 結果 |
AC
|
| 実行時間 | 230 ms / 5,000 ms |
| コード長 | 467 bytes |
| 記録 | |
| コンパイル時間 | 3,255 ms |
| コンパイル使用メモリ | 207,452 KB |
| 実行使用メモリ | 39,584 KB |
| 最終ジャッジ日時 | 2026-03-09 11:16:13 |
| 合計ジャッジ時間 | 4,665 ms |
|
ジャッジサーバーID (参考情報) |
judge2_0 / judge1_0 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| 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:16:28: 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"."
|
16 | f (x:xs) cs = f xs ((head ss) : fs ++ (tail ss))
| ^^^^
Main.hs:16:46: warning: [GHC-63394] [-Wx-partial]
In the use of ‘tail’
(imported from Prelude, but defined in GHC.Internal.List):
"This is a partial function, it throws an error on empty lists. Replace it with 'drop' 1, or use pattern matching or 'GHC.Internal.Data.List.uncons' instead. Consider refactoring to use "Data.List.NonEmpty"."
|
16 | f (x:xs) cs = f xs ((head ss) : fs ++ (tail ss))
| ^^^^
Main.hs:19:15: 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"."
|
19 | in print $ head $ f as [1..n]
| ^^^^
[2 of 2] Linking a.out
ソースコード
import Control.Monad
import qualified Data.ByteString.Char8 as B
import Data.Maybe (mapMaybe)
import Data.List (splitAt)
readInts :: B.ByteString -> [Int]
readInts = map fst . mapMaybe B.readInt . B.words
getInts = liftM readInts B.getLine
main = do
[n, m] <- getInts
as <- getInts
let
f [] cs = cs
f (x:xs) cs = f xs ((head ss) : fs ++ (tail ss))
where
(fs, ss) = splitAt (x-1) cs
in print $ head $ f as [1..n]
tottoripaper