May 30, 2022 · May 11, 2022 · May 11, 2022 · May 11, 2022 · May 12, 2022 · May 12, 2022
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
Original file line number	Diff line number	Diff line change
Expand Up		@@ -289,6 +289,28 @@ func removeNthFromEnd(_ head: ListNode?, _ n: Int) -> ListNode? {
		return dummyHead.next
		}
		```

	Scala:
	```scala
	object Solution {
	def removeNthFromEnd(head: ListNode, n: Int): ListNode = {
	val dummy = new ListNode(-1, head) // 定义虚拟头节点
	var fast = head // 快指针从头开始走
	var slow = dummy // 慢指针从虚拟头开始头
	// 因为参数 n 是不可变量,所以不能使用 while(n>0){n-=1}的方式
	for (i <- 0 until n) {
	fast = fast.next
	}
	// 快指针和满指针一起走,直到fast走到null
	while (fast != null) {
	slow = slow.next
	fast = fast.next
	}
	// 删除slow的下一个节点
	slow.next = slow.next.next
	// 返回虚拟头节点的下一个
	dummy.next
	}
	}
	```
		-----------------------
		<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>