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Data Structures for Coding Interviews in Python

Challenge: Reverse Linked List

Explore how to reverse a singly linked list by manipulating nodes and pointers in Python. This lesson helps you understand linked list operations and implement your own solution to reverse the list efficiently, reinforcing core data structure concepts essential for coding interviews.

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Statement

Given the head of a singly linked list, reverse the linked list and return its updated head.

Constraints:

Let n be the number of nodes in a linked list.

  • 1≤1 \leq n ≤5×102\leq 5\times10^2
  • −5×103≤-5\times10^3 \leq Node.value ≤5×103\leq 5\times10^3

Examples

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Try it yourself

Implement your solution in the following coding playground.

Python
usercode > main.py
from ds_v1.LinkedList.LinkedList import LinkedListNode



# class LinkedListNode:

#     def __init__(self, data):

#         self.data = data

#         self.next = None



def reverse(head):



    # Replace this placeholder return statement with your code

    return head
Reverse Linked List