added more c++ question #420
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📌 What does this PR do?
This PR expands the C++ quiz content by adding a new set of moderate to hard-level multiple-choice questions.
🔧 Type of Change
✅ How Has This Been Tested?
Reviewed all new MCQs for accuracy and clarity.
📊 Impact / Performance
User impact: Expands quiz coverage to include advanced C++ topics, improving challenge level for experienced learners.
✅ Checklist