結果

問題 No.55 正方形を描くだけの簡単なお仕事です。
ユーザー aimy
提出日時 2017-06-23 14:50:41
言語 Haskell
(9.10.1)
結果
AC  
実行時間 77 ms / 5,000 ms
コード長 605 bytes
コンパイル時間 2,108 ms
コンパイル使用メモリ 174,848 KB
実行使用メモリ 8,320 KB
最終ジャッジ日時 2024-10-03 04:10:31
合計ジャッジ時間 4,331 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge4
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
sample AC * 4
other AC * 21
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:7:38: warning: [GHC-63394] [-Wx-partial]
    In the use of ‘tail’
    (imported from Data.List, 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."
  |
7 | eqEdge xs = (and $ zipWith equal es (tail es)) && (and $ zipWith equal ds (tail ds))
  |                                      ^^^^

Main.hs:7:76: warning: [GHC-63394] [-Wx-partial]
    In the use of ‘tail’
    (imported from Data.List, 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."
  |
7 | eqEdge xs = (and $ zipWith equal es (tail es)) && (and $ zipWith equal ds (tail ds))
  |                                                                            ^^^^
[2 of 2] Linking a.out

ソースコード

diff #
プレゼンテーションモードにする

import Control.Monad
import Data.Maybe
import Data.List
equal x y = abs (x-y) < 1e-6
eqEdge xs = (and $ zipWith equal es (tail es)) && (and $ zipWith equal ds (tail ds))
 where (es,ds) = splitAt 4 (sort xs)
dist ((x1,y1),(x2,y2)) = sqrt $ fromIntegral $ (x2-x1)^2 + (y2-y1)^2
main = do
 [x1,y1,x2,y2,x3,y3] <- map read . words <$> getLine
 putStrLn $ maybe "-1" (unwords . map show) $ listToMaybe (square (x1,y1) (x2,y2) (x3,y3))
square p1 p2 p3 = do
 x4 <- [-200..200]
 y4 <- [-200..200]
 let p4 = (x4,y4)
 guard $ eqEdge (map dist [(p1,p2),(p1,p3),(p1,p4),(p2,p3),(p2,p4),(p3,p4)])
 return [x4, y4]
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