Update 22. 链表中倒数第 K 个结点.md

题目链接改为力扣中的对应题目，题目描述和代码按该题的接口调整。

notes/22. 链表中倒数第 K 个结点.md

@@ -1,6 +1,6 @@
 # 22. 链表中倒数第 K 个结点
 
-[牛客网](https://www.nowcoder.com/practice/886370fe658f41b498d40fb34ae76ff9?tpId=13&tqId=11167&tab=answerKey&from=cyc_github)
+[Leetcode](https://leetcode.cn/problems/lian-biao-zhong-dao-shu-di-kge-jie-dian-lcof/)
 
 ## 解题思路
 
@@ -9,19 +9,19 @@
 <div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/6b504f1f-bf76-4aab-a146-a9c7a58c2029.png" width="500"/> </div><br>
 
 ```java
-public ListNode FindKthToTail(ListNode head, int k) {
+public ListNode trainingPlan(ListNode head, int cnt) {
     if (head == null)
         return null;
-    ListNode P1 = head;
-    while (P1 != null && k-- > 0)
-        P1 = P1.next;
-    if (k > 0)
+    ListNode p1 = head;
+    while (p1 != null && cnt-- > 0)
+        p1 = p1.next;
+    if (cnt > 0)
         return null;
-    ListNode P2 = head;
-    while (P1 != null) {
-        P1 = P1.next;
-        P2 = P2.next;
+    ListNode p2 = head;
+    while (p1 != null) {
+        p1 = p1.next;
+        p2 = p2.next;
     }
-    return P2;
+    return p2;
 }
 ```