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PHP实现的线索二叉树及二叉树遍历方法详解

转载 作者:qq735679552 更新时间:2022-09-28 22:32:09 27 4
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这篇CFSDN的博客文章PHP实现的线索二叉树及二叉树遍历方法详解由作者收集整理,如果你对这篇文章有兴趣,记得点赞哟.

本文实例讲述了PHP实现的线索二叉树及二叉树遍历方法。分享给大家供大家参考,具体如下:

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<?php
   require 'biTree.php' ;
   $str = 'ko#be8#tr####acy#####' ;
   $tree = new BiTree( $str );
   $tree ->createThreadTree();
   echo $tree ->threadList() . "\n" ;从第一个结点开始遍历线索二叉树
   echo $tree ->threadListReserv();从最后一个结点开始反向遍历
?>

biTree.php:

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<?
   /**
    * PHP实现二叉树
    *
    * @author zhaojiangwei
    * @since 2011/10/25 10:32
    */
   //结点类
   class Node{
     private $data = NULL;
     private $left = NULL;
     private $right = NULL;
     private $lTag = 0;
     private $rTag = 0;
     public function Node( $data = false){
       $this ->data = $data ;
     }
     //我不喜欢使用魔术方法
     public function getData(){
       return $this ->data;
     }
     public function setData( $data ){
       $this ->data = $data ;
     }
     public function getLeft(){
       return $this ->left;
     }
     public function setLeft( $left ){
       $this ->left = $left ;
     }
     public function getRight(){
       return $this ->right;
     }
     public function setRight( $right ){
       $this ->right = $right ;
     }
     public function getLTag(){
       return $this ->lTag;
     }
     public function setLTag( $tag ){
       $this ->lTag = $tag ;
     }
     public function getRTag(){
       return $this ->rTag;
     }
     public function setRTag( $tag ){
       $this ->rTag = $tag ;
     }
   }
   //线索二叉树类
   class BiTree{
     private $datas = NULL; //要导入的字符串;
     private $root = NULL; //根结点
     private $leafCount = 0; //叶子结点个数
     private $headNode = NULL; //线索二叉树的头结点
     private $preNode = NULL; //遍历线索化二叉树时保存前一个遍历的结点
     public function BiTree( $datas ){
       is_array ( $datas ) || $datas = str_split ( $datas );
       $this ->datas = $datas ;
       $this ->backupData = $this ->datas;
       $this ->createTree(TRUE);
     }
     //前序遍历创建树
     //$root 判断是不是要创建根结点
     public function createTree( $root = FALSE){
       if (emptyempty( $this ->datas)) return NULL;
       $first = array_shift ( $this ->datas);
       if ( $first == '#' ){
         return NULL;
       } else {
         $node = new Node( $first );
         $root && $this ->root = $node ;
         $node ->setLeft( $this ->createTree());
         $node ->setRight( $this ->createTree());
         return $node ;
       }
     }
     //返回二叉树叶子结点的个数
     public function getLeafCount(){
       $this ->figureLeafCount( $this ->root);
       return $this ->leafCount;
     }
     private function figureLeafCount( $node ){
       if ( $node == NULL)
         return false;
       if ( $this ->checkEmpty( $node )){
         $this ->leafCount ++;
       } else {
         $this ->figureLeafCount( $node ->getLeft());
         $this ->figureLeafCount( $node ->getRight());
       }
     }
     //判断结点是不是叶子结点
     private function checkEmpty( $node ){
       if ( $node ->getLeft() == NULL && $node ->getRight() == NULL){
         return true;
       }
       return false;
     }
     //返回二叉树深度
     public function getDepth(){
       return $this ->traversDepth( $this ->root);
     }
     //遍历求二叉树深度
     public function traversDepth( $node ){
       if ( $node == NULL){
         return 0;
       }
       $u = $this ->traversDepth( $node ->getLeft()) + 1;
       $v = $this ->traversDepth( $node ->getRight()) + 1;
       return $u > $v ? $u : $v ;
     }
     //返回遍历结果,以字符串的形式
     //$order 按遍历形式返回,前中后
     public function getList( $order = 'front' ){
       if ( $this ->root == NULL) return NULL;
       $nodeList = array ();
       switch ( $order ){
         case "front" :
           $this ->frontList( $this ->root, $nodeList );
           break ;
         case "middle" :
           $this ->middleList( $this ->root, $nodeList );
           break ;
         case "last" :
           $this ->lastList( $this ->root, $nodeList );
           break ;
         default :
           $this ->frontList( $this ->root, $nodeList );
           break ;
       }
       return implode( $nodeList );
     }
     //创建线索二叉树
     public function createThreadTree(){
       $this ->headNode = new Node();
       $this ->preNode = & $this ->headNode;
       $this ->headNode->setLTag(0);
       $this ->headNode->setLeft( $this ->root);
       $this ->headNode->setRTag(1);
       $this ->threadTraverse( $this ->root);
       $this ->preNode->setRight( $this ->headNode);
       $this ->preNode->setRTag(1);
       $this ->headNode->setRight( $this ->preNode);
     }
     //线索化二叉树
     private function threadTraverse( $node ){
       if ( $node != NULL){
         if ( $node ->getLeft() == NULL){
           $node ->setLTag(1);
           $node ->setLeft( $this ->preNode);
         } else {
           $this ->threadTraverse( $node ->getLeft());
         }
         if ( $this ->preNode != $this ->headNode && $this ->preNode->getRight() == NULL){
           $this ->preNode->setRTag(1);
           $this ->preNode->setRight( $node );
         }
         $this ->preNode = & $node ; //注意传引用
         $this ->threadTraverse( $node ->getRight());
       }
     }
     //从第一个结点遍历中序线索二叉树
     public function threadList(){
       $arr = array ();
       for ( $node = $this ->getFirstThreadNode( $this ->root); $node != $this ->headNode; $node = $this ->getNextNode( $node )){
         $arr [] = $node ->getData();
       }
       return implode( $arr );
     }
     //从尾结点反向遍历中序线索二叉树
     public function threadListReserv(){
       $arr = array ();
       for ( $node = $this ->headNode->getRight(); $node != $this ->headNode; $node = $this ->getPreNode( $node )){
         $arr [] = $node ->getData();
       }
       return implode( $arr );
     }
     //返回某个结点的前驱
     public function getPreNode( $node ){
       if ( $node ->getLTag() == 1){
         return $node ->getLeft();
       } else {
         return $this ->getLastThreadNode( $node ->getLeft());
       }
     }
     //返回某个结点的后继
     public function getNextNode( $node ){
       if ( $node ->getRTag() == 1){
         return $node ->getRight();
       } else {
         return $this ->getFirstThreadNode( $node ->getRight());
       }
     }
     //返回中序线索二叉树的第一个结点
     public function getFirstThreadNode( $node ){
       while ( $node ->getLTag() == 0){
         $node = $node ->getLeft();
       }
       return $node ;
     }
     //返回中序线索二叉树的最后一个结点
     public function getLastThreadNode( $node ){
       while ( $node ->getRTag() == 0){
         $node = $node ->getRight();
       }
       return $node ;
     }
     //前序遍历
     private function frontList( $node , & $nodeList ){
       if ( $node !== NULL){
         $nodeList [] = $node ->getData();
         $this ->frontList( $node ->getLeft(), $nodeList );
         $this ->frontList( $node ->getRight(), $nodeList );
       }
     }
     //中序遍历
     private function middleList( $node , & $nodeList ){
       if ( $node != NULL){
         $this ->middleList( $node ->getLeft(), $nodeList );
         $nodeList [] = $node ->getData();
         $this ->middleList( $node ->getRight(), $nodeList );
       }
     }
     //后序遍历
     private function lastList( $node , & $nodeList ){
       if ( $node != NULL){
         $this ->lastList( $node ->getLeft(), $nodeList );
         $this ->lastList( $node ->getRight(), $nodeList );
         $nodeList [] = $node ->getData();
       }
     }
     public function getData(){
       return $this ->data;
     }
     public function getRoot(){
       return $this ->root;
     }
   }
?>

希望本文所述对大家PHP程序设计有所帮助.

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