void levelOrder(Node * root){
	//Write your code here
	queue<Node*> q;
	if(root != NULL){
		q.push(root);
		while(q.size()){
			cout << q.front()->data << " ";
			if(q.front()->left != NULL)
				q.push(q.front()->left);
			if(q.front()->right != NULL)
				q.push(q.front()->right);
			q.pop();
		}
	}
}