视频讲解  http://v.youku.com/v_show/id_XMTY1MTMzNjAyNA==.html

(1)定义两个指针

ListNode fast = head;

ListNode slow = head;

(2)将快指针向前移动N步

(3.1)判断此时快指针是否已经到达尽头,如果是,头节点就是要删除的节点,返回head.next。

(3.2)将快慢两个指针同时以相同的速度往前移动,当快指针走到尽头的时候,慢指针的下一个位置就是倒数第N个节点,将慢指针next指向next.next.

public class Solution {
public ListNode removeNthFromEnd(ListNode head, int n) { ListNode fast = head;
ListNode slow = head; for(int i=0;i<n;i++){
fast = fast.next;
} if(fast == null){
head = head.next;
return head;
} while(fast.next != null){
fast = fast.next;
slow = slow.next;
} slow.next = slow.next.next;
return head;
}
}

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