Treap：
http://www.ibr.cs.tu-bs.de/courses/ss98/audii/applets/BST/Treap-Example.html

Splay：
http://www.ibr.cs.tu-bs.de/courses/ss98/audii/applets/BST/SplayTree-Example.html

更多：
http://www.ibr.cs.tu-bs.de/courses/ss98/audii/applets/BST/index.html

做得无敌了