Difficulty: 中等
给定一个链表,删除链表的倒数第 _n _个节点,并且返回链表的头结点。
示例:
给定一个链表: 1->2->3->4->5, 和 n = 2.
当删除了倒数第二个节点后,链表变为 1->2->3->5.
说明:
给定的 n 保证是有效的。
进阶:
你能尝试使用一趟扫描实现吗?
Language: ****
# Definition for singly-linked list.
# class ListNode:
# def __init__(self, val=0, next=None):
# self.val = val
# self.next = next
class Solution:
def removeNthFromEnd(self, head: ListNode, n: int) -> ListNode:
if not head: return None
slow = head
tmp = head
for _ in range(n):
fast = tmp.next
tmp = tmp.next
if fast:
while fast.next:
fast = fast.next
slow = slow.next
slow.next = slow.next.next
else:
head = head.next
return head
原文:https://www.cnblogs.com/swordspoet/p/14163172.html