#include <iostream>  
using namespace std;  
typedef int Data;  
  
struct Node  
{  
    Node(Data d):data(d){left = right = NULL;};  
    Data data;  
    Node* left;  
    Node* right;
    Node* parent; 
};
  
class Tree  
{  
public:  
    Tree():root(NULL){};  
    Node* root;
    bool contains(Tree dst)
    {
        return subTree(root, dst.root); 
    };
private:    
    bool matchTree(Node* a, Node* b)
    {
        if(a == NULL && b == NULL)
            return true;
        if(a != NULL && b != NULL && a->data == b->data)
            return matchTree(a->left, b->left) && matchTree(a->right, b->right);
        return false;
    }; 
    
    bool subTree(Node* a, Node* b)
    {
        if(b == NULL)
            return true;
        if(a == NULL)
            return false;
        if(a->data == b->data)
        {
            return matchTree(a, b);
        } else {
            return subTree(a->left, b) || subTree(a->right, b);
        }
        
    };
};

int main()  
{  
    Tree tree;
    tree.root = new Node(5);
    tree.root->left = new Node(1);
    tree.root->right = new Node(7);
    tree.root->left->right = new Node(4);
    tree.root->left->right->left = new Node(3);
    Tree tree2;
    tree2.root = new Node(4);
    tree2.root->left = new Node(3);
    cout<<boolalpha<<tree.contains(tree2);
    system("pause");  
};