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: In Python, floor division (//) always rounds down towards negative infinity, turning -3.5 into -4.
The fix: Use int(a / b) to truncate fractional digits toward zero: int(a / b)
Remember: In Python, // rounds down toward -Infinity, while int() truncates toward 0.
The pattern behind it: logic errors.
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