From 09c1bd818abf8da2c1c426a06e46f2063b0089b0 Mon Sep 17 00:00:00 2001
From: Aaron-Lin-74 <84072071+Aaron-Lin-74@users.noreply.github.com>
Date: Fri, 4 Mar 2022 11:12:33 +1100
Subject: [PATCH] =?UTF-8?q?Update=200203.=E7=A7=BB=E9=99=A4=E9=93=BE?=
 =?UTF-8?q?=E8=A1=A8=E5=85=83=E7=B4=A0.md?=
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Creating a dummy head variable makes the logic clear.
---
 problems/0203.移除链表元素.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/problems/0203.移除链表元素.md b/problems/0203.移除链表元素.md
index 4e7bdd34..d2ba1ae8 100644
--- a/problems/0203.移除链表元素.md
+++ b/problems/0203.移除链表元素.md
@@ -342,14 +342,14 @@ function removeElements(head: ListNode | null, val: number): ListNode | null {
 
 ```typescript
 function removeElements(head: ListNode | null, val: number): ListNode | null {
-    head = new ListNode(0, head);
-    let pre: ListNode = head, cur: ListNode = head.next;
+    let dummyHead = new ListNode(0, head);
+    let pre: ListNode = dummyHead, cur: ListNode | null = dummyHead.next;
     // 删除非头部节点
     while (cur) {
         if (cur.val === val) {
             pre.next = cur.next;
         } else {
-            pre = pre.next;
+            pre = cur;
         }
         cur = cur.next;
     }