二叉树的各种操作，包括二叉树的建立，前序、中序、后序遍历二叉树，另外还包含一个霍夫曼编码的实现。-Binary tree of various operations, including the establishment of binary tree, the former sequence, in order, after the tree traversal, and also includes the implementation of a Huffman code.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001426s ]
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:0.091918s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001258s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001904s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001252s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003596s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001159s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003252s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016117s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001502s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 140862 [ RunTime:0.001398s ]
