public static Node lca(Node root, int v1, int v2) {
        if (v1 > v2) {
            int temp = v1;
            v1 = v2;
            v2 = temp;
        }
        
      	while (root != null) {
            if (v2 < root.data) {
                root = root.left;
            } else if (v1 > root.data) {
                root = root.right;
            } else {
                return root;
            }
        }
        
        return null;
    }