我们介绍了图形着色和应用程序在以前的帖子。正如在前面的文章中讨论，广泛用于图形着色。不幸的是，有没有高效的算法供图着色与颜色的最小数目，由于问题是一个已知的NP 完全问题。有近似算法虽然解决这个问题。以下是基本的贪婪算法来指定颜色。它并不能保证使用最低的颜色，但它保证颜色的数量上限。更多 d + 1 颜色的基本算法从不使用其中 d 是给定的图形中的一个顶点的最大程度。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001421s ]
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:0.092634s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001334s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001914s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001232s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003565s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001082s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003195s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014330s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001301s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 264800 [ RunTime:0.001607s ]
