{"id":756,"date":"2014-12-01T06:53:10","date_gmt":"2014-12-01T04:53:10","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=756"},"modified":"2014-12-27T21:44:55","modified_gmt":"2014-12-27T19:44:55","slug":"acronimos","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/acronimos\/","title":{"rendered":"Acr\u00f3nimos"},"content":{"rendered":"<h4>Introducci\u00f3n<\/h4>\n<p>A partir de una palabra de puede formar un acr\u00f3nimo uniendo un prefijo de la primera con un sufijo de la segunda. Por ejemplo,<\/p>\n<ul>\n<li>\u00abofim\u00e1tica\u00bb   es un acr\u00f3nimo de \u00aboficina\u00bb e \u00abinform\u00e1tica\u00bb<\/li>\n<li>\u00abinform\u00e1tica\u00bb es un acr\u00f3nimo de \u00abinformaci\u00f3n\u00bb y \u00abautom\u00e1tica\u00bb<\/li>\n<li>\u00abtele\u00f1eco\u00bb    es un acr\u00f3nimo de \u00abtelevisi\u00f3n\u00bb y \u00abmu\u00f1eco\u00bb<\/li>\n<\/ul>\n<h4>Enunciado<\/h4>\n<pre lang=\"text\">\n-- Definir la funci\u00f3n\n--    esAcronimo :: String -> String -> String -> Bool\n-- tal que (esAcronimo xs ys zs) se verifica si xs es un acr\u00f3nimo de ys\n-- y zs. Por ejemplo,\n--    esAcronimo \"ofimatica\" \"oficina\" \"informatica\"       ==  True\n--    esAcronimo \"informatica\" \"informacion\" \"automatica\"  ==  True\n<\/pre>\n<pre lang=\"haskell\">\nimport Data.List\nimport Test.QuickCheck\n\n-- 1\u00aa definici\u00f3n\n-- =============\n\nesAcronimo1 :: String -> String -> String -> Bool\nesAcronimo1 xs ys zs =\n    xs `elem` acronimos ys zs\n\n-- (acronimos xs ys) es la lista de acr\u00f3nimos de xs e ys. Por ejemplo,\n--    ghci> acronimos \"ab\" \"cde\"\n--    [\"cde\",\"de\",\"e\",\"\",\"acde\",\"ade\",\"ae\",\"a\",\"abcde\",\"abde\",\"abe\",\"ab\"]\nacronimos :: String -> String -> [String]\nacronimos xs ys =\n    [us++vs | us <- inits xs, vs <- tails ys]\n\n-- 2\u00aa definici\u00f3n\n-- =============\n\nesAcronimo2 :: String -> String -> String -> Bool\nesAcronimo2 xs ys zs = \n    or [isPrefixOf us ys && isSuffixOf vs zs | \n        (us,vs) <- [splitAt n xs | n <- [0..length xs]]]\n\n-- Verificaci\u00f3n de equivalencia\n-- ============================\n\n-- La propiedad es\nprop_esAcronimo :: String -> String -> String -> Bool\nprop_esAcronimo xs ys zs =\n    esAcronimo1 xs ys zs == esAcronimo2 xs ys zs\n\n-- La comprobaci\u00f3n es\n--    ghci> quickCheck prop_esAcronimo\n--    +++ OK, passed 100 tests.\n\n-- Comparaci\u00f3n de eficiencia\n-- =========================\n\n-- La comparaci\u00f3n es\n--    ghci> let r = replicate\n--    \n--    ghci> let n = 500 in esAcronimo1 (r n 'a' ++ r n 'b') (r n 'a') (r n 'b')\n--    True\n--    (3.76 secs, 1779334696 bytes)\n--    \n--    ghci> let n = 500 in esAcronimo2 (r n 'a' ++ r n 'b') (r n 'a') (r n 'b')\n--    True\n--    (0.04 secs, 16715376 bytes)\n--\n-- La 2\u00aa definici\u00f3n es m\u00e1s eficiente\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Introducci\u00f3n A partir de una palabra de puede formar un acr\u00f3nimo uniendo un prefijo de la primera con un sufijo de la segunda. Por ejemplo, \u00abofim\u00e1tica\u00bb es un acr\u00f3nimo de \u00aboficina\u00bb e \u00abinform\u00e1tica\u00bb \u00abinform\u00e1tica\u00bb es un acr\u00f3nimo de \u00abinformaci\u00f3n\u00bb y \u00abautom\u00e1tica\u00bb \u00abtele\u00f1eco\u00bb es un acr\u00f3nimo de \u00abtelevisi\u00f3n\u00bb y \u00abmu\u00f1eco\u00bb Enunciado &#8212; Definir la funci\u00f3n &#8211;&#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":[4],"tags":[35,8,26,74,170,171,169,73,75],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/756"}],"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=756"}],"version-history":[{"count":6,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/756\/revisions"}],"predecessor-version":[{"id":869,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/756\/revisions\/869"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=756"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=756"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=756"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}