https://leetcode.com/problems/remove-duplicates-from-sorted-list/

rm_dup_from_sorted_list.py

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None

class Solution:
    
    def deleteDuplicates(self, head: ListNode) -> ListNode:
        cur = head
        while cur:
            while cur.next and cur.val == cur.next.val:
                next_ = cur.next
                cur.next = cur.next.next
                
            cur = cur.next
            
        return head