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 9e180f75..4a973edb 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 @@ -22,10 +22,12 @@ 输入:head = [1,2,3,4,5], n = 2 输出:[1,2,3,5] + 示例 2: 输入:head = [1], n = 1 输出:[] + 示例 3: 输入:head = [1,2], n = 1 @@ -193,16 +195,18 @@ func removeNthFromEnd(head *ListNode, n int) *ListNode { * @param {number} n * @return {ListNode} */ -var removeNthFromEnd = function(head, n) { - let ret = new ListNode(0, head), - slow = fast = ret; - while(n--) fast = fast.next; - while (fast.next !== null) { - fast = fast.next; - slow = slow.next - }; - slow.next = slow.next.next; - return ret.next; +var removeNthFromEnd = function (head, n) { + // 创建哨兵节点,简化解题逻辑 + let dummyHead = new ListNode(0, head); + let fast = dummyHead; + let slow = dummyHead; + while (n--) fast = fast.next; + while (fast.next !== null) { + slow = slow.next; + fast = fast.next; + } + slow.next = slow.next.next; + return dummyHead.next; }; ``` ### TypeScript: