输入8个字符（数目可以自己设定，需要改动程序中N的值），注意空格也算字符，然后输入权值，会显示构造的霍夫曼树及每个字符的编码-Encode：enter 8 characters，then enter 8 numbers，this program will print the huffman tree and each char s code.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001352s ]
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:0.090170s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001233s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001870s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001192s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003711s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001058s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003199s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015966s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001430s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 307957 [ RunTime:0.001333s ]
