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Haskell Quiz/Weird Numbers/Solution Ninju - Revision history
2024-03-19T06:22:31Z
Revision history for this page on the wiki
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https://wiki.haskell.org/index.php?title=Haskell_Quiz/Weird_Numbers/Solution_Ninju&diff=32457&oldid=prev
Newacct at 07:51, 13 December 2009
2009-12-13T07:51:48Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 07:51, 13 December 2009</td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> if length args == 1</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> then do putStrLn $ "The weird numbers up to " ++ (head args) ++ ":"</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> then do putStrLn $ "The weird numbers up to " ++ (head args) ++ ":"</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> <del class="diffchange diffchange-inline">putStrLn $ show</del> $ takeWhile (<= max) weirdNumbers</div></td>
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<td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> <ins class="diffchange diffchange-inline">print</ins> $ takeWhile (<= max) weirdNumbers</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> else putStrLn "Usage: weird_numbers LIMIT"</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> else putStrLn "Usage: weird_numbers LIMIT"</div></td>
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Newacct
https://wiki.haskell.org/index.php?title=Haskell_Quiz/Weird_Numbers/Solution_Ninju&diff=22566&oldid=prev
Ninju at 00:35, 22 August 2008
2008-08-22T00:35:45Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 00:35, 22 August 2008</td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> putStrLn $ show $ takeWhile (<= max) weirdNumbers</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> putStrLn $ show $ takeWhile (<= max) weirdNumbers</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> else putStrLn "Usage: weird_numbers LIMIT"</div></td>
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<td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> else putStrLn "Usage: weird_numbers LIMIT"</div></td>
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Ninju
https://wiki.haskell.org/index.php?title=Haskell_Quiz/Weird_Numbers/Solution_Ninju&diff=22344&oldid=prev
Ninju at 23:56, 10 August 2008
2008-08-10T23:56:45Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 23:56, 10 August 2008</td>
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Ninju
https://wiki.haskell.org/index.php?title=Haskell_Quiz/Weird_Numbers/Solution_Ninju&diff=22343&oldid=prev
Ninju at 23:54, 10 August 2008
2008-08-10T23:54:44Z
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<p><b>New page</b></p><div><haskell><br />
module Main where<br />
import System.Environment<br />
<br />
main :: IO ()<br />
main = do args <- getArgs<br />
let max = read (head args)<br />
if length args == 1<br />
then do putStrLn $ "The weird numbers up to " ++ (head args) ++ ":"<br />
putStrLn $ show $ takeWhile (<= max) weirdNumbers<br />
else putStrLn "Usage: weird_numbers LIMIT"<br />
return ()<br />
<br />
weirdNumbers :: [Integer]<br />
weirdNumbers = filter weird [70..]<br />
where<br />
weird n = sum (divisors n) > n && (not . any (==n) . map sum . subsets . divisors) n<br />
<br />
divisors :: Integer -> [Integer]<br />
divisors n = filter ((==0) . (mod n)) [1..(n `div` 2)]<br />
<br />
subsets :: [a] -> [[a]]<br />
subsets [] = [[]]<br />
subsets (x:xs) = subsets xs ++ map (x:) (subsets xs)<br />
</haskell></div>
Ninju