{"id":17458,"date":"2022-10-24T19:57:15","date_gmt":"2022-10-24T14:27:15","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-the-code-isnt-efficient\/"},"modified":"2022-10-24T19:57:15","modified_gmt":"2022-10-24T14:27:15","slug":"solved-the-code-isnt-efficient","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-the-code-isnt-efficient\/","title":{"rendered":"[Solved] The code isn&#8217;t efficient"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-31240911\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"31240911\" data-parentid=\"31238375\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>There are a few tricks you can use to speed this up.<\/p>\n<p>The <code>n<\/code>th triangle number is <code>n*(n+1)\/2<\/code>.<\/p>\n<p>For all integers <code>n<\/code>, <code>n<\/code> and <code>n+1<\/code> are co-prime. This means that the number of divisors of <code>n*(n+1)<\/code> is the number of divisors <code>n<\/code> multiplied by the number of divisors of <code>n+1<\/code>.<\/p>\n<p>For an even number <code>k<\/code>, the number of divisors of <code>k\/2<\/code> is half the number of divisors of <code>k<\/code>.<\/p>\n<p>So, to compute the number of divisors of the <code>n<\/code>th triangle number, count the divisors of <code>n+1<\/code>, multiply with the number of divisors of <code>n<\/code> that you have from the previous step, and divide by two.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved The code isn&#8217;t efficient <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] There are a few tricks you can use to speed this up. The nth triangle number is n*(n+1)\/2. For all integers n, n and n+1 are co-prime. This means that the number of divisors of n*(n+1) is the number of divisors n multiplied by the number of divisors of n+1. For an even number &#8230; <a title=\"[Solved] The code isn&#8217;t efficient\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-the-code-isnt-efficient\/\" aria-label=\"More on [Solved] The code isn&#8217;t efficient\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[457,324],"class_list":["post-17458","post","type-post","status-publish","format-standard","hentry","category-solved","tag-algorithm","tag-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] The code isn&#039;t efficient - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-the-code-isnt-efficient\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] The code isn&#039;t efficient - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] There are a few tricks you can use to speed this up. The nth triangle number is n*(n+1)\/2. For all integers n, n and n+1 are co-prime. This means that the number of divisors of n*(n+1) is the number of divisors n multiplied by the number of divisors of n+1. For an even number ... 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