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/**
* ¶þ²æÊ÷¹¹ÔìËã·¨
* ¶þ²æÊ÷¶¨Ò壺ÊǶÈΪ2µÄÓÐÐòÊ÷£¬ËüµÄÌØµãÊÇÿ¸ö½ÚµãÖÁ¶àÓÐÁ½¿Ã×ÓÊ÷
* ÎÒÃǵÄËã·¨¾ÍÊǸù¾Ý¶þ²æÊ÷µÄµÝ¹é¶¨Òå¶øÀ´£¬ÏÂÃæÊǶþ²æÊ÷µÄµÝ¹é¶¨Ò壺
* n(n>=0)¸ö½ÚµãµÄÓÐÏÞ¼¯¡£Ëü»òÕßÊǿռ¯(n=0)£¬»òÕßͬʱÂú×ãÒ»ÏÂÁ½¸öÌõ¼þ£º
* (1) ÓÐÇÒ½öÓÐÒ»¸ö¸ù½Úµã
* (2) ÆäÓàµÄ½Úµã·Ö³ÉÁ½¿Ã»¥²»ÏཻµÄ×ó×ÓÊ÷ºÍÓÒ×ÓÊ÷
*
* ×¢£ºÓôËËã·¨¹¹ÔìµÄ¶þ²æÊ÷µÄÔªËØ±ØÐëʵÏÖComparable½Ó¿Ú
*
* @author Liangliang Zhang
*
*/
public class BinaryTree<E extends Comparable<E>> {
//½ÚµãÀà£ºÔªËØ£¬×ó×ÓÊ÷£¬ÓÒ×ÓÊ÷
private static class Node<E extends Comparable<E>>{
private E data;
private Node<E> left;
private Node<E> right;

//½Úµã¹¹Ôì·½·¨£¬¿ÉÀí½âΪҶ×Ó½Úµã
public Node(E data){
this.data = data;
this.left = null;
this.right = null;
}
}

//¸ù½Úµã
private Node<E> root;

//¿Õ¶þ²æÊ÷¹¹Ôì·½·¨
public BinaryTree(){
root = null;
}

/**
* ¸ù¾Ý½Úµã¼°±»ÔªËصݹé²éÕÒÔªËØÊÇ·ñÊôÓÚ´ËÊ÷
* @param node ½Úµã
* @param searchData ±»²éÕÒµÄÔªËØ
* @return ÕÒµ½·µ»Øtrue
*/
public boolean lookup(Node<E> node, E searchData){
if(searchData == null){
return false;
}
if(node.data.equals(searchData)){
return true;
}
if(searchData.compareTo(node.data) == -1){
return lookup(node.left, searchData);
}else{
return lookup(node.right, searchData);
}

}

public boolean lookup(E searchData){
return lookup(root, searchData);
}

/**
* ¸ù¾ÝËù¸ø½Úµã£¬ÔªËØ£¬½«ÔªËصݹé²éÕÒºÏÊÊλÖò¢½«ÔªËزåÈëµ½¶þ²æÊ÷ÖÐ
* @param node Ëù¸ø½Úµã
* @param insertData Ðè²åÈëÔªËØ
* @return Ðè²åÈëÔªËØµÄËùÔÚ½Úµã
*/
public Node<E> insert(Node<E> node, E insertData){
if(insertData == null ){
return node;
}
if(node == null){
node = new Node<E>(insertData);
}else{
if(insertData.compareTo(node.data) == -1){
node.


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