Python Interview Questions · interview question
Which practice avoids a common mistake with Prefix Sums?
Multiple choiceMediumpython-interview-2026interviewpythonpitfall
Answer and explanation
Correct answer
C. Do not lose track of the zero-boundary case when turning an inclusive range query into prefix subtraction.
Why
Do not lose track of the zero-boundary case when turning an inclusive range query into prefix subtraction. This is a common failure mode in real Python code and a frequent interview follow-up.
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