From a1e8af39a8ab834c08ba163be920c29add7d513f Mon Sep 17 00:00:00 2001
From: lavaicer <52038323+lavaicer@users.noreply.github.com>
Date: Sat, 2 Mar 2024 01:31:30 +0000
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96=2019.=20=E5=88=A0=E9=99=A4?=
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---
 ...0019.删除链表的倒数第N个节点.md | 25 ++++++++-----------
 1 file changed, 11 insertions(+), 14 deletions(-)

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 f508b523..d04df9f3 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
@@ -165,20 +165,17 @@ class Solution:
  * }
  */
 func removeNthFromEnd(head *ListNode, n int) *ListNode {
-    dummyHead := &ListNode{}
-    dummyHead.Next = head
-    cur := head
-    prev := dummyHead
-    i := 1
-    for cur != nil {
-        cur = cur.Next
-        if i > n {
-            prev = prev.Next
-        }
-        i++
-    }
-    prev.Next = prev.Next.Next
-    return dummyHead.Next
+	dummyNode := &ListNode{0, head}
+	fast, slow := dummyNode, dummyNode
+	for i := 0; i <= n; i++ { // 注意<=，否则快指针为空时，慢指针正好在倒数第n个上面
+		fast = fast.Next
+	}
+	for fast != nil {
+		fast = fast.Next
+		slow = slow.Next
+	}
+	slow.Next = slow.Next.Next
+	return dummyNode.Next
 }
 ```