Why is a dummy node useful?
Practice this question from Merge Two Sorted Lists - Dummy node Pattern Practice Quiz, with options and an explanation.
Question
Why is a dummy node useful?
Option A — Correct answer
It avoids special-casing the merged head
Option B
It sorts all nodes
Option C
It detects loops
Option D
It stores all values in a hash set
Explanation
It avoids special handling for the first node in the merged list.