Grokking the Coding Interview: Patterns for Coding Questions
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Remove Nth Node From End of List (medium)
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Problem Statement

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

Example 1:

  • Input: list = 1 -> 2 -> 3 -> 4 -> 5, n = 2
  • Expected Output: 1 -> 2 -> 3 -> 5
  • Justification: The 2nd node from the end is "4", so after removing it, the list becomes [1,2,3,5].

Example 2:

  • Input: list = 10 -> 20 -> 30 -> 40, n = 4
  • Expected Output: 20 -> 30 -> 40
  • Justification: The 4th node from the end is "10", so after removing it, the list becomes [20,30,40].

Example 3:

  • Input: list = 7 -> 14 -> 21 -> 28 -> 35, n = 3
  • Expected Output: 7 -> 14 -> 28 -> 35
  • Justification: The 3rd node from the end is "21", so after removing it, the list becomes [7,14,28,35].

Constraints:

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

Try it yourself

Try solving this question here:

Python3
Python3
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