19. Remove Nth Node From End of List(删除链表中的第n个结点）

Given a linked list, remove the n-th node from the end of list and return its head.

Example:

Given linked list: 1->2->3->4->5, and n = 2.

After removing the second node from the end, the linked list becomes 1->2->3->5.

Note:

Given n will always be valid.

方法一：双指针

删除倒数第n个点，我们首先得找到倒数第n个点才行。因为链表只能从头开始找，倒数第n个点就是正数第m-n（设链表长是m）。我让第一个指针先走n个点然后和第二个指针一起走，再走n-m个点。走到链表尾端时，第二个指针就走到倒数第n个数。

时间复杂度：o（n）                   空间复杂度：o（1）

原文地址：https://www.cnblogs.com/shaer/p/10555991.html

时间： 2024-08-27 00:44:25

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