Which optimized hashing pattern solves this lesson cleanly?
Practice this question from Find Duplicates - Frequency Map Pattern Practice Quiz, with options and an explanation.
Question
Which optimized hashing pattern solves this lesson cleanly?
Option A — Correct answer
Frequency map and append when count reaches 2.
Option B
Plain nested loops without stored state
Option C
Two pointers after sorting every time
Option D
Stack matching only
Explanation
Frequency map and append when count reaches 2.