{"id":4294,"date":"2018-11-09T06:00:22","date_gmt":"2018-11-09T04:00:22","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=4294"},"modified":"2019-01-17T15:37:34","modified_gmt":"2019-01-17T13:37:34","slug":"listas-equidigitales","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/listas-equidigitales\/","title":{"rendered":"Listas equidigitales"},"content":{"rendered":"<p>Una lista de n\u00fameros naturales es equidigital si todos sus elementos tienen el mismo n\u00famero de d\u00edgitos.<\/p>\n<p>Definir la funci\u00f3n<\/p>\n<pre lang=\"text\">\n   equidigital :: [Int] -> Bool\n<\/pre>\n<p>tal que (equidigital xs) se verifica si xs es una lista equidigital. Por ejemplo,<\/p>\n<pre lang=\"text\">\n   equidigital [343,225,777,943]   ==  True\n   equidigital [343,225,777,94,3]  ==  False\n<\/pre>\n<h4>Soluciones<\/h4>\n<pre lang=\"haskell\">\n-- 1\u00aa definici\u00f3n\n-- =============\n\nequidigital :: [Int] -> Bool\nequidigital xs = todosIguales (numerosDeDigitos xs)\n\n-- (numerosDeDigitos xs) es la lista de los n\u00fameros de d\u00edgitos de\n-- los elementos de xs. Por ejemplo, \n--    numerosDeDigitos [343,225,777,943]   ==  [3,3,3,3]\n--    numerosDeDigitos [343,225,777,94,3]  ==  [3,3,3,2,1]\nnumerosDeDigitos :: [Int] -> [Int]\nnumerosDeDigitos xs = [numeroDeDigitos x | x <- xs]\n\n-- (numeroDeDigitos x) es el n\u00famero de d\u00edgitos de x. Por ejemplo,\n--    numeroDeDigitos 475  ==  3\nnumeroDeDigitos :: Int -> Int\nnumeroDeDigitos x = length (show x)\n\n-- (todosIguales xs) se verifica si todos los elementos de xs son\n-- iguales. Por ejemplo,\n--    todosIguales [3,3,3,3]    ==  True\n--    todosIguales [3,3,3,2,1]  ==  False\ntodosIguales (x:y:zs) = x == y && todosIguales (y:zs)\ntodosIguales _        = True\n\n-- 2\u00aa definici\u00f3n\n-- =============\n\nequidigital2 :: [Int] -> Bool\nequidigital2 []     = True\nequidigital2 (x:xs) = and [numeroDeDigitos y == n | y <- xs]\n    where n = numeroDeDigitos x\n\n-- 3\u00aa definici\u00f3n\n-- =============\n\nequidigital3 :: [Int] -> Bool\nequidigital3 (x:y:zs) = numeroDeDigitos x == numeroDeDigitos y &&\n                        equidigital3 (y:zs)\nequidigital3 _        = True\n<\/pre>\n<h4>Pensamiento<\/h4>\n<blockquote><p>\nSe miente m\u00e1s de la cuenta<br \/>\npor falta de fantas\u00eda:<br \/>\ntambi\u00e9n la verdad se inventa.<\/p>\n<p>Antonio Machado\n<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Una lista de n\u00fameros naturales es equidigital si todos sus elementos tienen el mismo n\u00famero de d\u00edgitos. Definir la funci\u00f3n equidigital :: [Int] -> Bool tal que (equidigital xs) se verifica si xs es una lista equidigital. Por ejemplo, equidigital [343,225,777,943] == True equidigital [343,225,777,94,3] == False Soluciones &#8212; 1\u00aa definici\u00f3n &#8212; ============= equidigital ::&#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":[5],"tags":[100,8,28,6,33],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/4294"}],"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=4294"}],"version-history":[{"count":4,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/4294\/revisions"}],"predecessor-version":[{"id":4574,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/4294\/revisions\/4574"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=4294"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=4294"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=4294"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}