<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Texto de globo Car";
margin:0cm;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0cm;
margin-right:0cm;
margin-bottom:0cm;
margin-left:36.0pt;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
span.EstiloCorreo17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.TextodegloboCar
{mso-style-name:"Texto de globo Car";
mso-style-priority:99;
mso-style-link:"Texto de globo";
font-family:"Tahoma","sans-serif";}
.MsoChpDefault
{mso-style-type:export-only;}
@page Section1
{size:612.0pt 792.0pt;
margin:70.85pt 3.0cm 70.85pt 3.0cm;}
div.Section1
{page:Section1;}
/* List Definitions */
@list l0
{mso-list-id:1355841017;
mso-list-type:hybrid;
mso-list-template-ids:-574957546 -907905346 201981977 201981979 201981967 201981977 201981979 201981967 201981977 201981979;}
@list l0:level1
{mso-level-text:"\(%1\)";
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level2
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level3
{mso-level-tab-stop:108.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level4
{mso-level-tab-stop:144.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level5
{mso-level-tab-stop:180.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level6
{mso-level-tab-stop:216.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level7
{mso-level-tab-stop:252.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level8
{mso-level-tab-stop:288.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l0:level9
{mso-level-tab-stop:324.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=ES link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><span lang=EN-US>Hi,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>In exercise 2 of <a
href="http://www.walenz.org/Dijkstra/page0145.html">http://www.walenz.org/Dijkstra/page0145.html</a>
we need to write a function that holds<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
lang=EN-US><span style='mso-list:Ignore'>(1)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>The value 1 is in the sequence<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
lang=EN-US><span style='mso-list:Ignore'>(2)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>If x and y are in the sequence,
so is f(x,y), where f has the properties<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;
mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>f(x,y) > x<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;
mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>b.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>(y1 > y2) =>
(f(x,y1)>f(x,y2))<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>This is a solution for this problem, but an
inefficient one<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>hammingff :: [Integer]<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>hammingff = 1 : merge [ h x y | x <-
hammingff, y <- hammingff ] [ h x y | y <- hammingff, x <- hammingff ]<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>h x y = 2*x+3*y<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>merge :: (Ord a) => [a] -> [a] ->
[a]<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>merge [] xs = xs<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>merge ys [] = ys<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>merge (x:xs) (y:ys) = case compare x y of<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> LT -> x : merge xs
(y:ys)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> </span>GT -> y :
merge (x:xs) ys<o:p></o:p></p>
<p class=MsoNormal> <span lang=EN-US>EQ -> x : merge xs ys<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>anybody has a better solution?.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thanks<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Jose<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
</div>
</body>
</html>