83. Remove_Duplicates_from_Sorted_List.py

# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next


class Solution:
    def deleteDuplicates(self, head: Optional[ListNode]) -> Optional[ListNode]:
        cur = head

        while cur:
            while cur.next and cur.next.val == cur.val:
                cur.next = cur.next.next
            cur = cur.next

        return head