Kth To Last Elem

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Introduction

This Python challenge is about finding the kth to last element of a linked list. It is a common problem in computer science and requires a good understanding of linked lists.


Skills Graph

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Kth To Last Elem

Problem

Given a non-circular, singly linked list, the task is to find the kth to last element of the list. If k is 0, the last element should be returned. If k is greater than or equal to the length of the linked list, None should be returned. No additional data structures can be used, and it is assumed that a linked list class is already available.

Requirements

To solve this problem, the following requirements must be met:

  • The linked list is non-circular and singly linked.
  • k is a valid integer.
  • If k is 0, the last element should be returned.
  • If k is greater than or equal to the length of the linked list, None should be returned.
  • No additional data structures can be used.
  • A linked list class is already available.

Example Usage

The following scenarios can be used to test the solution:

  • An empty list should return None.
  • If k is greater than or equal to the length of the linked list, None should be returned.
  • If the linked list has only one element and k is 0, the element should be returned.
  • For a general case with many elements, where k is less than the length of the linked list, the kth to last element should be returned.

Summary

In summary, this Python challenge requires finding the kth to last element of a non-circular, singly linked list. The solution must meet the requirements stated above, and the example scenarios can be used to test the solution.

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