判断两个二叉树是否相等，就是当根节点相等时两数的左右子树对应相等或互换后相等，应使用递归来解

#include "stdafx.h"
#include <conio.h>
#include <iostream>
#include <stdio.h>
using namespace std;

typedef struct TreeNode
{
	char data;
	TreeNode *leftchild;
	TreeNode *rightchild;
};

bool CmpTree(TreeNode *Tree1,TreeNode *Tree2)
{
	if (NULL == Tree1 && NULL == Tree2)
	{
		return true;
	}
	else if (NULL != Tree1 && NULL != Tree2)
	{
		return IsTreeCoreEqual(Tree1,Tree2);
	}
	else
	{
		return false;
	}
}

bool IsTreeCoreEqual(TreeNode *Tree1,TreeNode *Tree2)
{
	if (Tree1->data == Tree2->data)
	{
		if (NULL == Tree1->leftchild && NULL == Tree2->leftchild && NULL == Tree1->rightchild && NULL == Tree2->rightchild)
			return true;
		else
			return(IsTreeCoreEqual(Tree1->leftchild,Tree2->leftchild) && IsTreeCoreEqual(Tree1->rightchild,Tree2->rightchild) ||
			IsTreeCoreEqual(Tree1->leftchild,Tree2->rightchild) && IsTreeCoreEqual(Tree1->rightchild,Tree2->leftchild));
	}
	else
	{
		return false;
	}
}