Solving Merge Two Sorted Lists using Merge.

Problem

Merge two sorted linked lists.

Pattern

This problem demonstrates the Merge pattern.

Approach

Dummy head node technique.

Solution 

  // Solution for Merge Two Sorted Lists
// Pattern: Merge
// O(n+m) time

Complexity

O(n+m) time

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