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package leetcode._19_;

import leetcode.common.ListNode;

/**

* Definition for singly-linked list.

* public class ListNode {

* int val;

* ListNode next;

* ListNode(int x) { val = x; }

* }

*/

class Solution {

public ListNode removeNthFromEnd(ListNode head, int n) {

ListNode node1 = head;

ListNode node2 = head;

// 由于题目中说到 n 永远有效，所以不做 nodeList 长度不足n的判断

for (int i = 0; i < n; i++) {

node1 = node1.next;

}

if (node1 == null) {

return head.next;

}

node1 = node1.next;

while (node1 != null) {

node1 = node1.next;

node2 = node2.next;

}

node2.next = node2.next.next;

return head;

}

}