Question
You are asked to implement a feature that requires
storing unique items and quickly checking for the existence of an item. Which data structure would be the most efficient for this?Solution
A Set data structure is specifically designed to store unique elements and provides very efficient (average O(1)) operations for adding elements and checking for membership (existence). Arrays and linked lists would require O(N) for checking uniqueness, and stacks/queues are not suitable for this purpose.
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