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: The range loop invalidates the iterators of the vector being modified, leading to undefined behavior.
The fix: Use a different looping mechanism that does not rely on iterators, such as a simple for loop with indices.
Remember: Modifying a container while iterating over it using range-based for loops can lead to iterator invalidation.
The pattern behind it: logic errors.
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