From dab89905adaac01f541ecb71f2a9e30980c88249 Mon Sep 17 00:00:00 2001
From: Evan Yang <kreios@qq.com>
Date: Sun, 3 Oct 2021 19:21:53 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=200206.=E7=BF=BB=E8=BD=AC?=
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---
 problems/0206.翻转链表.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/problems/0206.翻转链表.md b/problems/0206.翻转链表.md
index 4e450a1b..0c35f7d7 100644
--- a/problems/0206.翻转链表.md
+++ b/problems/0206.翻转链表.md
@@ -104,8 +104,10 @@ public:
 class Solution {
 public:
     ListNode* reverseList(ListNode* head) {
-        // 如果链表只有一个节点，返回自身
+        // 边缘条件判断
+        if(head == NULL) return NULL;
         if (head->next == NULL) return head;
+        
         // 递归调用，翻转第二个节点开始往后的链表
         ListNode *last = reverseList(head->next);
         // 翻转头节点与第二个节点的指向