4个数，加符号算出结果24的游戏，微软曾经面试题，用计算机求解，又详细过程。-Number 4, plus 24 symbols calculated results of the game, Microsoft face questions and use computers to solve. Also detailed process.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001366s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.091380s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001241s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001212s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003652s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001070s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014448s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001309s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 167769 [ RunTime:0.001360s ]
