LeetCode：203. 移除链表元素

1、题目描述

删除链表中等于给定值 val 的所有节点。

示例:

输入: 1->2->6->3->4->5->6, val = 6
输出: 1->2->3->4->5

2、题解

2.1、解法一

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

class Solution(object):
    def removeElements(self, head, val):
        """
        :type head: ListNode
        :type val: int
        :rtype: ListNode
        """
        node = head
        prev = head
        while node:
            if node.val == val:
                if node == head:
                    head = node.next
                else:
                    prev.next = node.next
            else:
                prev = node
            node = node.next

        return head