Given a pointer to the root of an N-ary tree, which has nodes with an extra pointer, gp (for grandparent), write a method that sets the grandparent of each node. Note that the root and its children’s grandparent should be null as they have none.

void SetGrandparent(Node *root)
{
    root->gp = nullptr;
    SetGrandparentHelper(root, nullptr);
}
 
void SetGrandparentHelper(Node *n, Node *parent)
{
    if (!n)
        return;
 
    for (Node *c : n->children)
    {
        c->gp = parent;
        SetGrandparentHelper(c, n);
    }
}