Solving Reverse Linked List using Iteration/recursion.

Problem

Reverse singly linked list.

Pattern

This problem demonstrates the Iteration/recursion pattern.

Approach

Iterative with three pointers.

Solution 

  // Solution for Reverse Linked List
// Pattern: Iteration/recursion
// O(n) time, O(1) space

Complexity

O(n) time, O(1) space

Best Practices

  • Identify the pattern before coding — pattern recognition saves time
  • Handle edge cases: empty input, single element, duplicates
  • Use descriptive variable names even in timed interviews
  • Test with the provided examples plus one custom case