题解 | #链表中倒数最后k个结点#

using System;
using System.Collections.Generic;

class Solution {
    public ListNode FindKthToTail (ListNode head, int k) {
        // write code here
        if(head == null) return null;
        ListNode slow = head;
        ListNode fast = head;
        int len = 0;
        while(fast != null){
            fast = fast.next;
            len++;
            if(len > k) slow = slow.next;
        }
        return k > len ? null : slow;
    }
}

逆天啊为什么我的oj时间这么久，复制别人的也久的离谱