give root binary tree return sum value node evenvalue grandparent if node evenvalue grandparent return 0A grandparent node parent parent exist Example 1input root 67827139null14nullnullnull5output 18explanation the red node nod evenvalue grandparent blue node evenvalue grandparentsExample 2input root 1output 0 ConstraintsThe number nod tree range 1 1041 Nodeval 100