题解 | #链表中倒数最后k个结点#

import java.util.*;

/*
 * public class ListNode {
 *   int val;
 *   ListNode next = null;
 *   public ListNode(int val) {
 *     this.val = val;
 *   }
 * }
 */

public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     *
     * @param pHead ListNode类
     * @param k int整型
     * @return ListNode类
     */
   public ListNode FindKthToTail (ListNode pHead, int k) {
        // write code here
        int length = 0;
        ListNode head = pHead;
        while(head!=null){
            length ++;
            head =head.next;
        }
        if(length >=k){
            for(int  i =0;i<length -k ;i++){
                pHead = pHead.next;
            } 
            return pHead;
        }
        return null;
    }
}