https://wiki.haskell.org/index.php?title=Haskell_Quiz/PP_Pascal/Solution_Jethr0&feed=atom&action=history
Haskell Quiz/PP Pascal/Solution Jethr0 - Revision history
2024-03-19T05:03:40Z
Revision history for this page on the wiki
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https://wiki.haskell.org/index.php?title=Haskell_Quiz/PP_Pascal/Solution_Jethr0&diff=10249&oldid=prev
Quale: +cat
2007-01-13T11:12:23Z
<p>+cat</p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 11:12, 13 January 2007</td>
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Quale
https://wiki.haskell.org/index.php?title=Haskell_Quiz/PP_Pascal/Solution_Jethr0&diff=9642&oldid=prev
JohannesAhlmann: using 3 spaces to make the triangle more symmetrical
2006-12-21T00:48:10Z
<p>using 3 spaces to make the triangle more symmetrical</p>
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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>-- also using the pascal triangle function from [[Blow your Mind]]</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>pp_pascal n = unlines . map (center . showp) $ pascal</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>pp_pascal n = unlines . map (center . showp) $ pascal</div></td>
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<td class="diff-marker"> </td>
<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> where pascal = take n $ iterate (\row -> zipWith (+) ([0] ++ row) (row ++ [0])) [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> where pascal = take n $ iterate (\row -> zipWith (+) ([0] ++ row) (row ++ [0])) [1]</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> showp = concat . intersperse " " . map show</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> showp = concat . intersperse "<ins class="diffchange diffchange-inline"> </ins> " . map show</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> len = length . showp $ last pascal</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> len = length . showp $ last pascal</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> center s = replicate ((len - (length s)) `div` 2) ' ' ++ s</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> center s = replicate ((len - (length s)) `div` 2) ' ' ++ s</div></td>
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JohannesAhlmann
https://wiki.haskell.org/index.php?title=Haskell_Quiz/PP_Pascal/Solution_Jethr0&diff=9641&oldid=prev
JohannesAhlmann at 00:35, 21 December 2006
2006-12-21T00:35:05Z
<p></p>
<p><b>New page</b></p><div>Example:<br />
<pre><br />
> pp_pascal 10<br />
1<br />
1 1<br />
1 2 1<br />
1 3 3 1<br />
1 4 6 4 1<br />
1 5 10 10 5 1<br />
1 6 15 20 15 6 1<br />
1 7 21 35 35 21 7 1<br />
1 8 28 56 70 56 28 8 1<br />
1 9 36 84 126 126 84 36 9 1<br />
</pre><br />
<br />
<br />
Solution:<br />
<haskell><br />
pp_pascal n = unlines . map (center . showp) $ pascal<br />
where pascal = take n $ iterate (\row -> zipWith (+) ([0] ++ row) (row ++ [0])) [1]<br />
showp = concat . intersperse " " . map show<br />
len = length . showp $ last pascal<br />
center s = replicate ((len - (length s)) `div` 2) ' ' ++ s<br />
</haskell></div>
JohannesAhlmann