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DELETE FROM huoyue_useronline WHERE user_ip = '54.161.118.57' OR timestamp < DATE_SUB('2019-07-24 08:03:12', INTERVAL 300 SECOND)

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REPLACE INTO `huoyue_useronline` (`timestamp`,`user_type`,`user_id`,`user_name`,`user_ip`,`user_agent`,`page_title`,`page_url`,`referral`) VALUES ('2019-07-24 08:03:12','guest','0','Guest','54.161.118.57','CCBot/2.0 (https://commoncrawl.org/faq/)','火跃工作室 &raquo; 双偶数阶幻方-火跃工作室','/tag/%E5%8F%8C%E5%81%B6%E6%95%B0%E9%98%B6%E5%B9%BB%E6%96%B9','')

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SELECT COUNT( * ) FROM huoyue_useronline

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标签类目:双偶数阶幻方

2015-04-18 11:32
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幻方常规解法汇总

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没法,组合数学还考幻方构造。这东西不看解法真不会写,虽然没见有啥用,但还是记录下,免得日后再找。按目前填写幻方的方法,是把幻方分成了三类,即奇数阶幻方双偶阶幻方单偶阶幻方。下面按这三类幻方,列出最常用解法(考试用,不求强大,只求有效!)。

 

奇数阶幻方(罗伯法)

奇数阶幻方[......]

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