Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the logic errors pattern
The wrong operator, an inverted condition, a formula the right way round but backwards.
What went wrong: std::remove does not actually remove elements from the container; it only shifts non-removed elements to the beginning and returns an iterator to the new end.
The fix: Use container.erase with the iterator returned by std::remove to actually remove elements.
Remember: Always follow std::remove with container.erase to truly remove elements from a container.
The pattern behind it: logic errors.
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