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	public static void zigzagTraversal(Node root){
	    Stack<Node> st1 = new Stack<>();
	    Stack<Node> st2 = new Stack<>();
	    
	    st1.push(root);
	    boolean flag = true;
	    
	    while(!st1.isEmpty()){
	        Node temp = st1.pop();
	        System.out.println(temp.data);
	        if(flag) {
	            if(temp.left != null){
	                st2.push(temp.left);
	            }  if(temp.right != null){
	                st2.push(temp.right);
	            }
	        } else {
	            if(temp.right != null) {
	                st2.push(temp.right);
	            }
	            if (temp.left != null){
	                st2.push(temp.left);
	            }
	        } 
	        
	        
	        if(st1.isEmpty()){
	            flag = !flag;
	    
	             Stack<Node> temp1 = st1;
	             st1 = st2;
	             st2 = temp1;
	        }
	    }
    }