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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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