{"id":437,"date":"2012-07-29T02:12:51","date_gmt":"2012-07-29T06:12:51","guid":{"rendered":"http:\/\/www.joshho.com\/blog\/?p=437"},"modified":"2012-09-07T16:17:36","modified_gmt":"2012-09-07T20:17:36","slug":"project-euler-problem-12","status":"publish","type":"post","link":"https:\/\/www.joshho.com\/blog\/2012\/07\/29\/project-euler-problem-12\/","title":{"rendered":"Project Euler &#8211; Problem 12"},"content":{"rendered":"<p>Problem 12: What is the value of the first triangle number to have over five hundred divisors?<br \/>\n<!--more--><br \/>\n<code><\/p>\n<pre lang='java'>\r\n\r\nclass runner\r\n{\r\n\tpublic static int numOfDivisors(int n){\r\n\t\tint result = 0;\r\n\t\t\r\n\t\tfor(int i = 1; i<= Math.floor(Math.sqrt(n));i++){\r\n\t\t\tif(n%i == 0){\r\n\t\t\t\tif(n\/i == i) result ++;\r\n\t\t\t\telse result += 2;\r\n\t\t\t}\r\n\t\t}\r\n\t\t\r\n\t\treturn result;\r\n\t}\r\n\tpublic static void main (String[] args) throws java.lang.Exception\r\n\t{\r\n\t\tlong time = System.currentTimeMillis();\r\n\t\tint i=1;int cur=0;\r\n\t\twhile(true){\r\n\t\t\tcur += i;\r\n\t\t\tint divs = numOfDivisors(cur);\r\n\t\t\tSystem.out.println(\"doing \"+cur+\" divs:\"+divs);\t\r\n\t\t\tif(divs > 500){\r\n\t\t\t\tSystem.out.println(cur + \" time: \" + (System.currentTimeMillis() - time));\r\n\t\t\t\tbreak;\r\n\t\t\t}\r\n\t\t\ti++;\r\n\t\t}\r\n\t}\r\n}\r\n<\/pre>\n<p><\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Problem 12: What is the value of the first triangle number to have over five hundred divisors?<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[56],"tags":[],"_links":{"self":[{"href":"https:\/\/www.joshho.com\/blog\/wp-json\/wp\/v2\/posts\/437"}],"collection":[{"href":"https:\/\/www.joshho.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.joshho.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.joshho.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.joshho.com\/blog\/wp-json\/wp\/v2\/comments?post=437"}],"version-history":[{"count":0,"href":"https:\/\/www.joshho.com\/blog\/wp-json\/wp\/v2\/posts\/437\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.joshho.com\/blog\/wp-json\/wp\/v2\/media?parent=437"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.joshho.com\/blog\/wp-json\/wp\/v2\/categories?post=437"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.joshho.com\/blog\/wp-json\/wp\/v2\/tags?post=437"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}