一辆汽车加满油后可行驶n km，有若干加油站，设计有效地算法，指出应在那些站加油，是得加油次数最少-Fill up the car after driving an n km, there are a number of gas stations, design and effective method that should be in those refueling stations, is the least number of very filling
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001248s ]
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:0.088452s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001212s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001877s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001215s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003598s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001133s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003229s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014956s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001368s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 196692 [ RunTime:0.002388s ]
