{"id":1904,"date":"2015-12-24T06:00:53","date_gmt":"2015-12-24T04:00:53","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=1904"},"modified":"2015-12-31T07:53:41","modified_gmt":"2015-12-31T05:53:41","slug":"arbol-de-navidad","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/arbol-de-navidad\/","title":{"rendered":"\u00c1rbol de Navidad"},"content":{"rendered":"<p>Definir el procedimiento<\/p>\n<pre lang=\"text\">\n   arbol :: Int -> IO ()\n<\/pre>\n<p>tal que (arbol n) dibuja el \u00e1rbol de Navidad con una copa de altura n y un tronco de altura la mitad de n. Por ejemplo,<\/p>\n<pre lang=\"text\">\n   \u03bb> arbol 5\n   \n        X\n       XXX\n      XXXXX\n     XXXXXXX\n    XXXXXXXXX\n        X\n        X\n   \n   \u03bb> arbol 6\n   \n         X\n        XXX\n       XXXXX\n      XXXXXXX\n     XXXXXXXXX\n    XXXXXXXXXXX\n         X\n         X\n         X\n   \n   \u03bb> arbol 7\n   \n          X\n         XXX\n        XXXXX\n       XXXXXXX\n      XXXXXXXXX\n     XXXXXXXXXXX\n    XXXXXXXXXXXXX\n          X\n          X\n          X\n\n<\/pre>\n<h4>Soluciones<\/h4>\n<pre lang=\"haskell\">\narbol :: Int -> IO ()\narbol n = do\n  putStrLn \"\"\n  sequence_ [putStrLn c | c <- triangulo n]\n  sequence_ [putStrLn c | c <- rectangulo n]\n  putStrLn \"\"\n\ntriangulo :: Int -> [String]\ntriangulo n =\n    [replicate (n-k) ' ' ++ replicate (1+2*k) 'X' | k <- [0..n-1]]\n\nrectangulo :: Int -> [String]\nrectangulo n =\n    [replicate n ' ' ++ \"X\" | _ <- [1..n `div` 2]]\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Definir el procedimiento arbol :: Int -> IO () tal que (arbol n) dibuja el \u00e1rbol de Navidad con una copa de altura n y un tronco de altura la mitad de n. Por ejemplo, \u03bb> arbol 5 X XXX XXXXX XXXXXXX XXXXXXXXX X X \u03bb> arbol 6 X XXX XXXXX XXXXXXX XXXXXXXXX XXXXXXXXXXX X&#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":[8,311,312,19,313],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/1904"}],"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=1904"}],"version-history":[{"count":4,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/1904\/revisions"}],"predecessor-version":[{"id":1940,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/1904\/revisions\/1940"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=1904"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=1904"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=1904"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}