劍指Offer-Java-鏈表中倒數第k個結點

package com.hlq.test;

/**
 * @author helongqiang
 * @date 2020/5/16 22:04
 */

/**
 * 輸入一個鏈表，輸出該鏈表中倒數第k個結點。
 */

public class Solution {

    public ListNode FindKthToTail(ListNode head,int k){
        if(head == null || k == 0){
            return null;
        }
        ListNode slow = head;
        ListNode fast = head;
        for(int i=0;i<k;i++){
            if(fast == null){
                return null;
            }
            fast = fast.next;
        }
        while (fast != null){
            slow = slow.next;
            fast = fast.next;
        }
        return slow;
    }
}