Microsoft Online Assessment (OA) Questions

Q: How many OA questions does Microsoft ask?

AceOffer has reconstructed 6 distinct Microsoft OA interview questions from 13 verified candidate reports, each with the follow-ups candidates reported and a last-reported date.

Q: When does Microsoft send its online assessment?

The Microsoft OA reports AceOffer has run from October 2025 to October 2026; the most recent is from October 2026. Timing within a hiring cycle varies by role, so check each question page for its own dates.

Q: Which platform does Microsoft use for the OA?

5 of the 6 Microsoft OA question pages mention HackerRank, from candidate reports. Other reports do not name the platform.

Q: How long is the Microsoft OA?

Reports mention a 90-minute limit. Each question page notes its own timing where candidates reported it.

Q: How fresh is AceOffer's Microsoft OA question data?

The catalog is refreshed monthly from new candidate reports, and every question shows when it was last reported.

These are the 6 online assessment (OA) questions Microsoft candidates reported receiving, sorted by how often each was reported. OA: Balanced Permutation (Is 1..k a Contiguous Block, for Every k) leads at 3×. Every question shows when it was last reported; the catalog refreshes monthly.

Part of the full catalog of Microsoft interview questions, covering every round.

AceOffer is not affiliated with, endorsed by, or sponsored by Microsoft. Questions are reconstructed from interview experiences candidates shared, not from Microsoft materials.

Key facts

•6 distinct OA questions indexed
•13 candidate reports across those questions
•Most reported: OA: Balanced Permutation (Is 1..k a Contiguous Block, for Every k) — 3× (last seen March 2026)
•OA reports span October 2025 – October 2026
•5 of 6 question pages mention HackerRank
•Time limit mentioned: 90 minutes
•Refreshed monthly · last updated October 2026

Which Microsoft rounds ask OA questions?

The Microsoft rounds below are where these questions come up. Counts are distinct questions, not times asked.

Two HackerRank problems: a balanced permutation check, the maximum XOR product, counting non-decreasing arrays with given digit sums, the cheapest trip with fuel prices by city, the most frequent substring within limits, and picking k non-adjacent servers.6 questions

Most reported: OA: Balanced Permutation (Is 1..k a Contiguous Block, for Every k) — 3×

Which Microsoft OA questions get asked most?

Sorted by candidate-report frequency. Click any question for the full breakdown.

Question	Round	Reported	Last seen
OA: Balanced Permutation (Is 1..k a Contiguous Block, for Every k)	OA	3×	March 2026
OA: Maximise (A xor X) * (B xor X) for X < 2^N, Modulo 1e9+7	OA	2×	July 2026
OA: Count Non-Decreasing Arrays with Given Digit Sums	OA	2×	October 2026
OA: Cheapest Trip When Fuel Price Differs by City (Dijkstra with State)	OA	2×	August 2026
OA: Most Frequent Substring Within Length and Unique-Letter Limits	OA	2×	October 2026
OA: Pick K Non-Adjacent Servers, Minimise the Largest Pick	OA	2×	October 2026

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FAQ

How many OA questions does Microsoft ask?▾

AceOffer has reconstructed 6 distinct Microsoft OA interview questions from 13 verified candidate reports, each with the follow-ups candidates reported and a last-reported date.

What is the most common Microsoft OA interview question?▾

OA: Balanced Permutation (Is 1..k a Contiguous Block, for Every k) — reported 3 times, last seen March 2026.

When does Microsoft send its online assessment?▾

The Microsoft OA reports AceOffer has run from October 2025 to October 2026; the most recent is from October 2026. Timing within a hiring cycle varies by role, so check each question page for its own dates.

Which platform does Microsoft use for the OA?▾

5 of the 6 Microsoft OA question pages mention HackerRank, from candidate reports. Other reports do not name the platform.

How long is the Microsoft OA?▾

Reports mention a 90-minute limit. Each question page notes its own timing where candidates reported it.

How fresh is AceOffer's Microsoft OA question data?▾

The catalog is refreshed monthly from new candidate reports, and every question shows when it was last reported.

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