剑指offer_链表_删除链表的结点

思路：链表基本操作。

# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None
#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param head ListNode类 
# @param val int整型 
# @return ListNode类
#
class Solution:
    def deleteNode(self , head: ListNode, val: int) -> ListNode:
        # write code here
        newhead = ListNode(-1)
        p = newhead
        while head:
            if head.val == val:
                head = head.next
            else:
                p.next = head
                p = p.next
                head = head.next
        return newhead.next