{"id":349,"date":"2014-06-25T07:00:38","date_gmt":"2014-06-25T05:00:38","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=349"},"modified":"2014-11-29T12:23:53","modified_gmt":"2014-11-29T10:23:53","slug":"n-gramas","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/n-gramas\/","title":{"rendered":"N gramas"},"content":{"rendered":"<p>Un <a href=\"http:\/\/es.wikipedia.org\/wiki\/N-grama\">n-grama<\/a> de una sucesi\u00f3n es una subsucesi\u00f3n de n elementos.<\/p>\n<h4>Enunciado<\/h4>\n<pre lang=\"text\">\n-- Definir la funci\u00f3n\n--    nGramas :: Int -> [a] -> [[a]]\n-- tal que (nGramas k xs) es la lista de los n-gramas de xs de longitud\n-- k. Por ejemplo,\n--    nGramas 0 \"abcd\"  ==  [\"\"]\n--    nGramas 1 \"abcd\"  ==  [\"a\",\"b\",\"c\",\"d\"]\n--    nGramas 2 \"abcd\"  ==  [\"ab\",\"ac\",\"ad\",\"bc\",\"bd\",\"cd\"]\n--    nGramas 3 \"abcd\"  ==  [\"abc\",\"abd\",\"acd\",\"bcd\"]\n--    nGramas 4 \"abcd\"  ==  [\"abcd\"]\n--    nGramas 5 \"abcd\"  ==  []\n<\/pre>\n<h4>Soluciones<\/h4>\n<pre lang=\"haskell\">\nnGramas :: Int -> [a] -> [[a]]\nnGramas 0 xs     = [[]]\nnGramas n []     = []\nnGramas n (x:xs) = [x:ys | ys <- nGramas (n-1) xs] ++ nGramas n xs\n<\/pre>\n<h4>Referencia<\/h4>\n<p>El ejercicio est\u00e1 basado en el <a href=\"http:\/\/bit.ly\/1pdxx8l\">problema del 3 de junio<\/a> de <a href=\"https:\/\/twitter.com\/1HaskellADay\">1HaskellADay<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un n-grama de una sucesi\u00f3n es una subsucesi\u00f3n de n elementos. Enunciado &#8212; Definir la funci\u00f3n &#8212; nGramas :: Int -> [a] -> [[a]] &#8212; tal que (nGramas k xs) es la lista de los n-gramas de xs de longitud &#8212; k. Por ejemplo, &#8212; nGramas 0 \u00ababcd\u00bb == [\u00ab\u00bb] &#8212; nGramas 1 \u00ababcd\u00bb ==&#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":[7],"tags":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/349"}],"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=349"}],"version-history":[{"count":10,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/349\/revisions"}],"predecessor-version":[{"id":680,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/349\/revisions\/680"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}