求解任意两个多边形的并集，交集，差集，要求是简单多边形，可以是凸多边形和凹多边形-solving arbitrary polygon and two sets, intersection, difference, the request is a simple polygon, it is concave and convex polygon Polygon
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001764s ]
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:0.108698s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001852s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001222s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000974s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003188s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000997s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003959s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014923s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001134s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 124217 [ RunTime:0.012832s ]
