{"id":2879,"date":"2017-01-31T06:00:34","date_gmt":"2017-01-31T04:00:34","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=2879"},"modified":"2017-02-08T07:30:51","modified_gmt":"2017-02-08T05:30:51","slug":"eliminacion-de-triplicados","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/eliminacion-de-triplicados\/","title":{"rendered":"Eliminaci\u00f3n de triplicados"},"content":{"rendered":"<p>Definir la funci\u00f3n<\/p>\n<pre lang=\"text\">\n   sinTriplicados :: Eq a => [a] -> [a]\n<\/pre>\n<p>tal que (sinTriplicados xs) es la lista obtenida dejando en xs s\u00f3lo las dos primeras ocurrencias de cada uno de sus elementos. Por ejemplo,<\/p>\n<pre lang=\"text\">\n   sinTriplicados \"aaabcbccdbabdcd\"  ==  \"aabcbcdd\"\n   sinTriplicados \"xxxxx\"            ==  \"xx\"\n   sinTriplicados \"abcabc\"           ==  \"abcabc\"\n   sinTriplicados \"abcdabcaba\"       ==  \"abcdabc\"\n   sinTriplicados \"abacbadcba\"       ==  \"abacbdc\"\n   sinTriplicados \"aaabcbccdbabdcd\"  ==  \"aabcbcdd\"\n   sinTriplicados (show (5^4^3))     ==  \"54210108624757363989\"\n   sinTriplicados (show (8^8^8))     ==  \"60145207536139279488\"\n<\/pre>\n<h4>Soluciones<\/h4>\n<pre lang=\"haskell\">\nimport Data.List (delete)\n\nsinTriplicados :: Eq a => [a] -> [a]\nsinTriplicados xs = aux xs [] []\n  where aux [] _ _ = []\n        aux (x:xs) ys zs\n          | x `elem` zs = aux xs ys zs\n          | x `elem` ys = x : aux xs (delete x ys) (x:zs)\n          | otherwise   = x : aux xs (x:ys) zs\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Definir la funci\u00f3n sinTriplicados :: Eq a => [a] -> [a] tal que (sinTriplicados xs) es la lista obtenida dejando en xs s\u00f3lo las dos primeras ocurrencias de cada uno de sus elementos. Por ejemplo, sinTriplicados \u00abaaabcbccdbabdcd\u00bb == \u00abaabcbcdd\u00bb sinTriplicados \u00abxxxxx\u00bb == \u00abxx\u00bb sinTriplicados \u00ababcabc\u00bb == \u00ababcabc\u00bb sinTriplicados \u00ababcdabcaba\u00bb == \u00ababcdabc\u00bb sinTriplicados \u00ababacbadcba\u00bb == \u00ababacbdc\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":[4],"tags":[25,26,6],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/2879"}],"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=2879"}],"version-history":[{"count":3,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/2879\/revisions"}],"predecessor-version":[{"id":2912,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/2879\/revisions\/2912"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=2879"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=2879"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=2879"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}