链表专题更新cpp代码

animation-simulation/链表篇/leetcode141环形链表.md

@@ -72,3 +72,24 @@ var hasCycle = function(head) {
     return false;
 };
 ```
+
+C++ Code:
+
+```cpp
+class Solution {
+public:
+    bool hasCycle(ListNode *head) {
+         ListNode * fast = head;
+         ListNode * low = head;
+         while (fast != nullptr && fast->next != nullptr) {
+             fast = fast->next->next;
+             low = low->next;
+             if (fast == low) {
+                 return true;
+             }
+         }
+         return false;
+    }
+};
+```
+