Prefix Sums Interview Questions
3 interview questions in our bank cover Prefix Sums, most of them Coding Questions. They average 3.0/5 difficulty — medium — and each one was reported by a candidate after a real interview. Companies known to ask about Prefix Sums: LinkedIn, Amazon, OpenAI.
Practice these on the problems board →Companies that ask about Prefix Sums
Question mix
- Coding Questions3
Difficulty
- 3/5 — medium3
Questions tagged Prefix Sums
Skew Metrics for a Connection-Count Histogram
3/5A coding question on summarising a heavily skewed distribution of connection counts, where a few accounts hold most links and the typical one holds few. From a compressed frequency table, compute a handful of statistics and a one-line takeaway, in time proportional to the table size, with exact rounding and degenerate inputs handled.
Coding QuestionsLinkedInLongest Run of Healthy Servers After One Fixed-Length Repair
3/5A coding question on a log of working and broken machines in a row, where one repair of a fixed length can be applied or skipped. The task is to find the longest unbroken stretch that can be achieved.
Coding QuestionsAmazonBalanced Sequence Generation for (AI, Human, Task) Tags with Prefix Constraints
3/5Construct a sequence of daily tag pairs so that no prefix of the schedule ever drifts out of balance between the three tags involved. Posed at OpenAI, this constructive problem has a greedy answer that is easy to write and hard to justify, and the follow-up constraint rules out the first rule most candidates reach for. You will track running counts per tag, prove the invariant holds at every prefix length, and recognise the lengths for which no valid sequence exists. Subscribers can read the full problem and the constructive proof.
Coding QuestionsOpenAI
Prefix Sums interview FAQ
- How many Prefix Sums interview questions are there?
- 3 reported questions, mostly Coding Questions.
- Which companies ask Prefix Sums questions?
- LinkedIn (1), Amazon (1), OpenAI (1).
- How hard are Prefix Sums questions?
- They average 3.0 out of 5: 3 at 3/5.