链表专题更新cpp代码

animation-simulation/链表篇/面试题 02.03. 链表中间节点.md

@@ -48,6 +48,10 @@
 
 ![在这里插入图片描述](https://img-blog.csdnimg.cn/20210321131249789.gif)
 
+**题目代码**
+
+Java Code:
+
 ```java
 class Solution {
     public ListNode middleNode(ListNode head) {
@@ -64,3 +68,21 @@ class Solution {
 }
 ```
 
+C++ Code:
+
+```cpp
+public:
+    ListNode* middleNode(ListNode* head) {
+        ListNode * fast = head;//快指针
+        ListNode * slow = head;//慢指针
+        //循环条件，思考一下跳出循环的情况
+        while (fast != nullptr && fast->next != nullptr) {
+            fast = fast->next->next;
+            slow = slow->next;
+        }
+        //返回slow指针指向的节点
+        return slow;             
+    }
+};
+```
+