基于二叉链表的二叉树结构相等判断（c++)

#include<iostream>
using namespace std;
typedef struct BiTNode
{
	char data;
	struct BiTNode* lchild, * rchild;
}BiTNode, * BiTree;
int flag;
void CreatBitree(BiTree& T, char s[], int& i)
{
	if (s[i] == '0')
		T = NULL;
	else
	{
		T = new BiTNode;
		T->data = s[i];
		CreatBitree(T->lchild, s, ++i);
		CreatBitree(T->rchild, s, ++i);
	}
}
void Judge(BiTree T1, BiTree T2)
{
	if (T1 && !T2 || !T1 && T2)
		flag = 0;
	if (T1 && T2)
	{
		if (T1->data != T2->data)
			flag = 0;
		Judge(T1->lchild, T2->lchild);
		Judge(T1->rchild, T2->rchild);
	}
}
int main()
{
	char s1[100], s2[100];
	BiTree T1, T2;
	while (cin >> s1 && s1[0] != '0')
	{
		int i = -1, j = -1;
		cin >> s2;
		CreatBitree(T1, s1, ++i);
		CreatBitree(T2, s2, ++j);
		flag = 1;
		Judge(T1, T2);
		if (flag)
			cout << "相等" << endl;
		else
			cout << "不相等" << endl;
	}
	return 0;
}