diff --git a/problems/0019.删除链表的倒数第N个节点.md b/problems/0019.删除链表的倒数第N个节点.md
index b9859968..f84e334e 100644
--- a/problems/0019.删除链表的倒数第N个节点.md
+++ b/problems/0019.删除链表的倒数第N个节点.md
@@ -75,7 +75,12 @@ public:
             fast = fast->next;
             slow = slow->next;
         }
-        slow->next = slow->next->next;
+        slow->next = slow->next->next; 
+        
+        // ListNode *tmp = slow->next;  C++释放内存的逻辑
+        // slow->next = tmp->next;
+        // delete nth;
+        
         return dummyHead->next;
     }
 };