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0019.remove-nth-node-from-end-of-list

题目

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

For 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:

  1. Given n will always be valid. 不存在链的长度<n的情况
  2. Try to do this in one pass.

解题思路

  1. 获取倒数第n个节点的父节点d
  2. 再根据父节点d是否为head节点,选取不同的删除方式。