题解 | #删除链表的倒数第n个节点#

public class Solution {
    /**
     * 
     * @param head ListNode类 
     * @param n int整型 
     * @return ListNode类
     */
    public ListNode removeNthFromEnd (ListNode head, int n) {
        // write code here
        ListNode slow = head;
        ListNode fast = head;
        for(int i=0;i<n;i++){
            fast = fast.next;
        }
        while(fast!=null && fast.next!=null){
            fast = fast.next;
            slow = slow.next;
        }
        if(fast == null){
            return slow.next;
        }
        slow.next = slow.next.next;
        return head;
    }
}