text: Driver function
code: int main ( ) { Node * root = new Node ( 1 ) ; root -> left = new Node ( 2 ) ; root -> right = new Node ( 3 ) ; root -> right -> left = new Node ( 4 ) ; root -> right -> left -> right = new Node ( 5 ) ; root -> right -> left -> right -> left = new Node ( 6 ) ; cout << ( getSum ( root ) ) ; return 0 ; }