<LeetCode><Easy> 203 Remove Linked List Elements

Remove all elements from a linked list of integers that have value val.

Example
Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6

Return: 1 --> 2 --> 3 --> 4 --> 5

#Python2 128ms

class Solution(object):
def removeElements(self, head, val):
if not head:
return
while 1:
if not head:return
if val==head.val:
head=head.next
else:break
p=head
while 1:
if not p or not p.next:return head
if val==p.next.val:
p.next=p.next.next
if not p.next:return head
if p.next.val!=val:
p=p.next