求解最短哈密顿回路，先用贪心方法求解一个路径及权值，以此作为回溯剪枝界。-Solving the shortest Hamiltonian circuit, first with the greedy method to solve a path and weight, as a back pruning sector.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001192s ]
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:0.089820s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001266s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001965s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001226s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003651s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001101s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003190s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014771s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001386s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 173983 [ RunTime:0.001298s ]
