problem19

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19. Remove Nth Node From End of List (Medium)

Given the head of a linked list, remove the nth node from the end of the list and return its head.

Follow up: Could you do this in one pass?

 

Example 1:

Input: head = [1,2,3,4,5], n = 2
Output: [1,2,3,5]

Example 2:

Input: head = [1], n = 1
Output: []

Example 3:

Input: head = [1,2], n = 1
Output: [1]

 

Constraints:

• The number of nodes in the list is sz.
• 1 <= sz <= 30
• 0 <= Node.val <= 100
• 1 <= n <= sz

Related Topics

[Linked List] [Two Pointers]

Hints

Hint 1

Maintain two pointers and update one with a delay of n steps.

Documentation

Index

• type ListNode

Types

type ListNode

type ListNode = kit.ListNode

ListNode - Definition for singly-linked list.