通俗易懂
http://m.blog.csdn.net/blog/qiankun1993/6782838
牛http://nano9th.wordpress.com.cn/2009/02/17/%e7%bd%91%e7%bb%9c%e6%b5%81%e5%9f%ba%e7%a1%80%e7%af%87-edmond-karp%e7%ae%97%e6%b3%95/