2． 设计一个启发式函数（最好是A*搜索函数）并编程实现，设计报告中必须给出函数的具体形式并说明设计思想（或分析为什么是A*算法）-2. Design a heuristic function (A* is the best search function), and Programming, design report must be given to the specific function and state forms design (or analyze why is A* algorithm)
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001020s ]
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:0.091853s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000954s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001114s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001095s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003109s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000940s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003933s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.022112s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001025s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 124699 [ RunTime:0.015745s ]
