使用链式存储实现一元多项式的以下运算：
实现多项式的加法、减法、求导。
-Used to achieve a dollar store chain polynomial of the following operations: the realization of polynomial addition, subtraction, derivation.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001044s ]
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:0.105673s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001143s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001880s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001187s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003666s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001010s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003427s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016328s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001253s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 259271 [ RunTime:0.001030s ]
