This is my code:
> class Solution:
# @param A : head node of linked list # @return the head node in the linked list def deleteDuplicates(self, A): head = A while A and A.next: while A.val == A.next.val: A.next = A.next.next A = A.next return head
this is the error I get:
Traceback (most recent call last): File "main.py", line 181, in Z = obj.deleteDuplicates(A) File "/tmp/judge/solution.py", line 14, in deleteDuplicates while A.val == A.next.val: AttributeError: 'NoneType' object has no attribute 'val'
anyone knows why it happens? I AM checking for None after all…