結果
| 問題 |
No.512 魔法少女の追いかけっこ
|
| コンテスト | |
| ユーザー |
yutasth
|
| 提出日時 | 2017-05-06 00:49:30 |
| 言語 | Haskell (9.10.1) |
| 結果 |
AC
|
| 実行時間 | 2 ms / 2,000 ms |
| コード長 | 445 bytes |
| コンパイル時間 | 2,043 ms |
| コンパイル使用メモリ | 173,056 KB |
| 実行使用メモリ | 5,376 KB |
| 最終ジャッジ日時 | 2024-06-27 06:18:54 |
| 合計ジャッジ時間 | 3,092 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| other | AC * 53 |
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:16:42: 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."
|
16 | distances as = zip as $ zipWith (-) (tail as) as
| ^^^^
[2 of 2] Linking a.out
ソースコード
import Prelude
import Data.Bool (bool)
main :: IO ()
main = do
[x, y] <- map read . words <$> getLine
_ <- getLine
as <- map read . words <$> getLine
putStrLn $ bool "NO" "YES" $ solve x y as
solve :: Int -> Int -> [Int] -> Bool
solve vx vy as = let dv = vy - vx
in all (\(a, d) -> dv * a <= d * vx) $ distances as
where
distances :: [Int] -> [(Int, Int)]
distances as = zip as $ zipWith (-) (tail as) as
yutasth