update leetcode

xiaobinqt · Sep 6, 2023 · 5bee2e8 · 5bee2e8
1 parent ba7d321
commit 5bee2e8
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/book.leetcode/docs/medium/19.md b/book.leetcode/docs/medium/19.md
@@ -54,8 +54,7 @@ func removeNthFromEnd(head *ListNode, n int) *ListNode {
 		tmpc = tmpc.Next
 	}
 
-	//fmt.Println("长度为...", length)
-
+	// 需要有虚拟头结点是因为，可能删除的是最后的节点，也就是头结点，用虚拟头结点可以统一处理
 	dummy := &ListNode{
 		Val:  0,
 		Next: head,