{"id":6232,"date":"2021-04-01T06:00:59","date_gmt":"2021-04-01T04:00:59","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=6232"},"modified":"2021-04-08T09:23:45","modified_gmt":"2021-04-08T07:23:45","slug":"reduccion-de-consecutivos-relacionados","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/reduccion-de-consecutivos-relacionados\/","title":{"rendered":"Reducci\u00f3n de consecutivos relacionados"},"content":{"rendered":"<p>Definir la funci\u00f3n<\/p>\n<pre lang=\"text\">\n   reducida :: (a -> a -> Bool) -> [a] -> [a]\n<\/pre>\n<p>tal que (reducida r xs) obtenida elimando en xs las repeticiones de elementos consecutivos queverifican la relaci\u00f3n r. Por ejemplo,<\/p>\n<pre lang=\"text\">\n   reducida (==) [4,4,2,1,1,1,2,5]  ==  [4,2,1,2,5]\n   reducida (<)  [4,4,2,1,1,1,2,5]  ==  [4,4,2,1,1,1]\n   reducida (>=) [4,4,2,1,1,1,2,5]  ==  [4,5]\n   reducida (>)  [4,4,2,1,1,1,2,5]  ==  [4,4,5]\n   reducida (\/=) [4,4,2,1,1,1,2,5]  ==  [4,4]\n<\/pre>\n<h4>Soluciones<\/h4>\n<pre lang=\"haskell\">\nimport Data.List (groupBy)\n\n-- 1\u00aa soluci\u00f3n\nreducida :: (a -> a -> Bool) -> [a] -> [a]\nreducida _ []     = []\nreducida r (x:xs) = x : reducida r (dropWhile (r x) xs)\n\n-- 2\u00aa soluci\u00f3n\nreducida2 :: (a -> a -> Bool) -> [a] -> [a]\nreducida2 r = foldr aux []\n  where aux x xs = x : dropWhile (r x) xs\n\n-- 3\u00aa soluci\u00f3n\nreducida3 :: (a -> a -> Bool) -> [a] -> [a]\nreducida3 r xs =\n  map head (groupBy r xs)\n<\/pre>\n<h4>Nuevas soluciones<\/h4>\n<ul>\n<li>En los comentarios se pueden escribir nuevas soluciones.\n<li>El c\u00f3digo se debe escribir entre una l\u00ednea con &#60;pre lang=&quot;haskell&quot;&#62; y otra con &#60;\/pre&#62;\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Definir la funci\u00f3n reducida :: (a -> a -> Bool) -> [a] -> [a] tal que (reducida r xs) obtenida elimando en xs las repeticiones de elementos consecutivos queverifican la relaci\u00f3n r. Por ejemplo, reducida (==) [4,4,2,1,1,1,2,5] == [4,2,1,2,5] reducida (=) [4,4,2,1,1,1,2,5] == [4,5] reducida (>) [4,4,2,1,1,1,2,5] == [4,4,5] reducida (\/=) [4,4,2,1,1,1,2,5] == [4,4] Soluciones&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"footnotes":"","_jetpack_memberships_contains_paid_content":false},"categories":[2],"tags":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/6232"}],"collection":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/comments?post=6232"}],"version-history":[{"count":2,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/6232\/revisions"}],"predecessor-version":[{"id":6272,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/6232\/revisions\/6272"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=6232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=6232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=6232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}