标签:tmp type init sel 头结点 并且 ext from col
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。
# Definition for singly-linked list. class ListNode: def __init__(self, x): self.val = x self.next = None class Solution: def removeNthFromEnd(self, head, n): """ :type head: ListNode :type n: int :rtype: ListNode """ tmp = head cnt = 0 while tmp: cnt+=1 tmp = tmp.next # print(cnt) ans = ListNode(-1) tmp = ans for _ in range(cnt-n): tmp.next = ListNode(head.val) tmp = tmp.next head = head.next head = head.next while head: tmp.next = ListNode(head.val) tmp = tmp.next head = head.next return ans.next
标签:tmp type init sel 头结点 并且 ext from col
原文地址:https://www.cnblogs.com/TreeDream/p/10303148.html