HackerRank compare two linked lists

file.cpp

/*
  Compare two linked lists A and B
  Return 1 if they are identical and 0 if they are not. 
  Node is defined as 
  struct Node
  {
     int data;
     struct Node *next;
  }
*/
int CompareLists(Node *headA, Node* headB)
{
    Node *a = headA, *b = headB;
    while( a && b && ( a->data == b->data ) ) {
        a = a->next;
        b = b->next;
    }
    
    return a == b; //both are null pointers
}