java用于解决数独问题，这是一个设置一个矩阵的方法，当然核心依然是穷举。-Sudoku java be used in resolving the issue, this is a way to set up a matrix, of course, the core is still exhaustive.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002030s ]
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:0.097002s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002364s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001927s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002295s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003675s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002033s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003235s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014616s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002449s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 48851 [ RunTime:0.001210s ]
