Are duplicate checks bad for performance?
No, a simple boolean check (current != max) takes a microscopic fraction of a microsecond and has zero impact on the O(N) time complexity.
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More FAQs in Handling Arrays with Duplicate Elements
If not explicitly ignored, a duplicate of the maximum value will overwrite the second largest variable, resulting in both variables holding the maximum value.
Add a logical AND condition (current != max) when evaluating whether to update the second largest variable.
It does not exist. The only distinct value is 5. Your code should recognize this and return a sentinel value like -1 or throw an exception.
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