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Coding Interview Patterns
Array and Number Patterns
Prefix Sums

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Q 01/ 04IntermediateQuestion 1 of 4. 0 correct, 0 incorrect.

A prefix array p has length n + 1 with p[0] = 0. Which expression gives the sum of a[i] to a[j] inclusive?

p[j] − p[i]

p[j + 1] − p[i]

p[j] − p[i − 1]

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For Hugin I fear lest he come not home, But for Munin my care is more.

Grímnismál 20 · tr. Bellows, 1923

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