编译原理
1. 采用C或C++编写First和Follow函数，实现其求解过程。
（1）FIRST集合计算方法：
① 若Xàa..， 则将终结符ａ加入FIRST(X)中；
② 若Xàe，则将e加入FIRST(X)中；
③ 若XàY…，且Y属于非终结符，则将FIRST(Y){e}加入到FIRST(X)中；（注：“”表示除去e元素，即FIRST(Y)中的非
文 件 列 表
firstfollow First and Follow.doc bin firstfollow.cbp firstfollow.depend firstfollow.layout main.cpp obj
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002091s ]
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:0.140098s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.003217s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002979s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.003129s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.005948s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002403s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003401s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016891s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002773s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 56453 [ RunTime:0.001232s ]
