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// @Title: 删除链表的倒数第 N 个结点 (Remove Nth Node From End of List)
// @Author: 15816537946@163.com
// @Date: 2020-10-31 10:12:22
// @Runtime: 0 ms
// @Memory: 2.2 MB
/**
* Definition for singly-linked list.
* type ListNode struct {
* Val int
* Next *ListNode
* }
*/
func removeNthFromEnd(head *ListNode, n int) *ListNode {
if head == nil {
return head
}
tmp := new(ListNode)
tmp.Next = head
lo := tmp
hi := tmp
for i := 0; i <= n; i++ {
hi = hi.Next
}
for hi != nil {
hi = hi.Next
lo = lo.Next
}
lo.Next = lo.Next.Next
return tmp.Next
}
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