C Sharp (C#) - Collections
What happens if you try to add a duplicate element to a
HashSet<int> in C#?What happens if you try to add a duplicate element to a HashSet<int> in C#?
easy🧠 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Understand HashSet behavior on duplicates
A HashSet stores unique elements and ignores duplicates when adding.Step 2: Check what happens on adding a duplicate
Adding a duplicate element does not change the set and no error occurs.Final Answer:
The duplicate element is ignored and not added. -> Option BQuick Check:
HashSet duplicate add = ignored [OK]
Quick Trick: HashSet ignores duplicates silently when adding [OK]
Common Mistakes:
MISTAKES- Thinking duplicates replace existing elements
- Expecting an exception on duplicates
- Assuming HashSet clears before adding duplicates
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