【二叉树遍历】中序------非递归

最新推荐文章于 2024-04-19 18:14:57 发布

bxyill

最新推荐文章于 2024-04-19 18:14:57 发布

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分类专栏：二叉树文章标签： null include struct

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#include <iostream>
#include <stack>
using namespace std;

//树结构
struct BTreeNode
{
	int m_nValue;
	BTreeNode *m_pLeft;
	BTreeNode *m_Right;
};
void visit(BTreeNode *n)
{
	cout<< n->m_nValue<<" ";
}
//非递归中序遍历，利用栈实现
void InOrder(BTreeNode *root)
{
	stack<BTreeNode *> s;
	while(root != NULL || !s.empty())
	{
		while(root != NULL)
		{
			s.push(root);
			root = root->m_pLeft;
		}
		if(!s.empty())
		{
			root = s.top();
			s.pop();
			visit(root);
			root = root->m_Right;
		}
	}
}

//按照先序创建二叉树,0表示空  
BTreeNode *CreateTree()  
{  
    int ch;  
    cin>> ch;  
    if(ch == 0)  
    {  
         return NULL;  
    }  
    else  
    {  
         BTreeNode *root = new BTreeNode();  
         root->m_nValue = ch;  
         root->m_pLeft = CreateTree();  
         root->m_Right = CreateTree();  
         return root;  
    }  
}  
  
void main()
{
	BTreeNode *root = NULL;
	cout <<"创建树：";
	root = CreateTree();

	cout << "非递归先序遍历：";
	InOrder(root);
	cout << endl;
}

//运行结果
//创建树：1 2 4 0 0 5 0 0 3 6 0 0 7 0 0
//非递归先序遍历：4 2 5 1 6 3 7
//Press any key to continue