Merge pull request #1683 from wyzzoo/patch-1

Update 0019.删除链表的倒数第N个节点.md，修复 CPP 解法代码中的内存泄漏

problems/0019.删除链表的倒数第N个节点.md

@@ -76,6 +76,11 @@ public:
             slow = slow->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;
     }
 };