<img src=http://www.mamicode.com/"http://img.blog.csdn.net/20141011162525042?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvUl9NaXNheWE=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />#include>

 
SDUTOJ 2054  双向链表