結果
| 問題 |
No.406 鴨等間隔の法則
|
| コンテスト | |
| ユーザー |
情報学生
|
| 提出日時 | 2019-08-23 18:20:58 |
| 言語 | Haskell (9.10.1) |
| 結果 |
AC
|
| 実行時間 | 157 ms / 2,000 ms |
| コード長 | 782 bytes |
| コンパイル時間 | 8,326 ms |
| コンパイル使用メモリ | 180,780 KB |
| 実行使用メモリ | 21,888 KB |
| 最終ジャッジ日時 | 2024-07-07 13:07:50 |
| 合計ジャッジ時間 | 8,514 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 29 |
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:23:57: 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."
|
23 | solve xs = if any (== 0) xss then "NO" else if all (== (head xss)) xss then "YES" else "NO"
| ^^^^
[2 of 2] Linking a.out
ソースコード
import Control.Applicative ((<$>))
import Data.Char (isSpace)
import Data.List (unfoldr, sort)
import Data.ByteString.Char8 (ByteString)
import qualified Data.ByteString.Char8 as B
getL :: (ByteString -> [Int]) -> IO [Int]
getL f = f <$> B.getLine
readIL :: (ByteString -> Maybe (Int, ByteString)) -> (ByteString -> [Int])
readIL f = unfoldr g
where
g s = do
(n, s') <- f s
return (n, B.dropWhile isSpace s')
main :: IO ()
main = do
B.getLine
putStrLn =<< solve <$> getL (readIL B.readInt)
solve :: [Int] -> String
solve xs = if any (== 0) xss then "NO" else if all (== (head xss)) xss then "YES" else "NO"
where
xss = f $ sort xs
f :: [Int] -> [Int]
f [x] = []
f (x:y:ys) = (y - x) : f (y:ys)
情報学生