結果

問題 No.1169 Row and Column and Diagonal
コンテスト
ユーザー poapoa
提出日時 2020-08-15 01:10:12
言語 Haskell
(9.10.1)
結果
AC  
実行時間 34 ms / 2,000 ms
コード長 517 bytes
コンパイル時間 4,618 ms
コンパイル使用メモリ 180,888 KB
実行使用メモリ 10,112 KB
最終ジャッジ日時 2024-10-10 16:59:33
合計ジャッジ時間 5,852 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 * 2
other AC * 13
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:20:12: 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."
   |
20 | shift xs = tail xs ++ [head xs]
   |            ^^^^

Main.hs:20:24: 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."
   |
20 | shift xs = tail xs ++ [head xs]
   |                        ^^^^
[2 of 2] Linking a.out

ソースコード

diff # 

{-# LANGUAGE OverloadedStrings #-}

import qualified Control.Monad         as M
import qualified Data.ByteString.Char8 as B

main :: IO ()
main = do
  n <- readLn :: IO Int
  let m  = (n `div` 2) + 1
  let xs = merge [1..m] [m+1..n] 
  let ys = iterate shift xs
  B.putStr . B.unlines . map (B.pack . unwords . map show) . take n $ ys

merge :: [Int] -> [Int] -> [Int]
merge xs     []     = xs
merge []     ys     = ys
merge (x:xs) (y:ys) = x : y : merge xs ys

shift :: [Int] -> [Int]
shift xs = tail xs ++ [head xs]
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