Microsoft Coding & Algorithms Interview Questions

Microsoft Coding & Algorithms interview questions are centered on algorithmic problem solving, clear coding, and the ability to reason about complexity under time pressure. At Microsoft you’ll typically be evaluated on problem decomposition, correctness, time/space complexity, edge-case handling, and communication: interviewers want to see that you can produce a correct solution, explain your approach, and iterate when given feedback. Expect online assessments and phone screens that use collaborative coding editors, followed by a loop of focused technical interviews that mix coding problems with occasional system or design-style questions depending on level. For effective interview preparation, prioritize pattern recognition and timed practice: master arrays and strings, trees and graphs, hashing, dynamic programming, and complexity analysis, and practice explaining tradeoffs aloud. Simulate the coding environment you’ll face, write and test complete solutions, and rehearse concise, structured explanations of your thought process. Balance breadth with depth so you can move quickly between easy and medium problems while still handling harder algorithmic puzzles when required.

100 Questions 1 Company08.03.2026
Showing 20 results
Role
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Microsoft
Medium
Software Engineer Locked

Return Top K Relevant Apps

This question evaluates algorithmic problem-solving around aggregation and ranking, testing skills in computing aggregated relevance scores, determini...

Coding & Algorithms
12
0
108 people solved
Mar 16, 2026
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Microsoft
Medium
Software Engineer

Implement tree traversals, BFS, and subsets generation

1) Define a TreeNode class for a binary tree with an integer value and left/right pointers. Implement preorder, inorder, and postorder traversals: (a)...

Coding & Algorithms
5
0
75 people solved
Sep 6, 2025
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Microsoft
Medium
Software Engineer Locked

Check palindrome number and next palindrome

This question evaluates understanding of numeric and string manipulation along with algorithmic problem-solving for palindrome detection and generatio...

Coding & Algorithms
7
0
66 people solved
Jan 9, 2026
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Microsoft
Medium
Software Engineer Locked

Rotate a 3×3 digit grid by 180°

This question evaluates understanding of grid and string manipulation, coordinate transformations, spatial reasoning, and character validation in cons...

Coding & Algorithms
10
0
115 people solved
Jan 6, 2026
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Microsoft
Medium
Software Engineer Locked

Answer common graph, grid, and array tasks

This set of problems evaluates algorithmic skills across arrays, graph theory, and grid/matrix traversal—covering sliding-window and contiguous-segmen...

Coding & Algorithms
23
0
207 people solved
Mar 1, 2026
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Microsoft
Medium
Software Engineer

Solve three scheduling and array problems

In this round you are given three separate coding problems to solve. --- Problem 1: Schedule tasks with cooldown You are given: - A list of tasks, whe...

Coding & Algorithms
15
0
119 people solved
Oct 28, 2025
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Microsoft
Hard
Software Engineer Locked

Implement a sliding-window rate limiter allow()

This question evaluates understanding of sliding-window rate limiting, time-windowed counting, and per-user state management for high-throughput servi...

Coding & Algorithms
5
0
51 people solved
Feb 11, 2026
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Microsoft
Hard
Software Engineer Locked

Solve cache, grid path, and substring problems

This multipart question evaluates algorithmic problem-solving and data structure design skills, covering a capacity-bounded cache with eviction behavi...

Coding & Algorithms
3
0
45 people solved
Feb 11, 2026
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Microsoft
Hard
Software Engineer Locked

Answer suffix maximum-frequency queries

This question evaluates algorithm design skills and array-processing competency for answering repeated queries efficiently, focusing on time and space...

Coding & Algorithms
5
0
99 people solved
Feb 11, 2026
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Microsoft
Medium
Machine Learning Engineer Locked

Detect stop tokens during streaming inference

This question evaluates streaming sequence-detection and pattern-matching skills, including online buffer management and correct handling of overlappi...

Coding & Algorithms
3
0
60 people solved
Feb 11, 2026
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Microsoft
Easy
Data Engineer

Design a scalable URL shortener

Design a highly scalable URL shortening service, similar to Bitly or TinyURL. The service converts long URLs into short links and redirects short-code...

Coding & Algorithms
18
0
122 people solved
Jan 22, 2025
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Microsoft
Medium
Data Scientist Locked

Print Org Chart by Level

This question evaluates the ability to model hierarchical data, work with tree/graph data structures, select traversal strategies, and analyze time an...

Coding & Algorithms
3
0
37 people solved
Jan 16, 2026
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Microsoft
Hard
Software Engineer Locked

Solve Throughput, Rate Limiting, and LFU

This set of tasks evaluates algorithmic problem-solving, data structure design, and systems-oriented reasoning by testing throughput calculation, roll...

Coding & Algorithms
10
0
91 people solved
Mar 20, 2026
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Microsoft
Medium
Software Engineer

Implement a Snapshot Set Iterator

Implement a data structure SnapshotSet<T> with the following interface: `java interface SnapshotSet<T> { void add(T e); void remove(T e); ...

Coding & Algorithms
33
0
274 people solved
Mar 13, 2026
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Microsoft
Hard
Software Engineer

Find all balanced k in a permutation

You are given a permutation \(p\) of length \(n\) containing each integer from \(1\) to \(n\) exactly once. For each \(k\) where \(1 \le k \le n\), de...

Coding & Algorithms
26
0
202 people solved
Mar 1, 2026
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Microsoft
Medium
Software Engineer

Implement greedy decoding and beam search

You are given access to an auto-regressive language model that can score the next token based on a prefix. Assume: - next_logprobs(prefix_tokens) -> M...

Coding & Algorithms
8
0
134 people solved
Feb 15, 2026
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Microsoft
Medium
Software Engineer Locked

Implement four data-structure/string geometry tasks

This multi-part question evaluates manual big-integer string multiplication, robust parsing and tokenization of complex log formats, computational geo...

Coding & Algorithms
4
0
59 people solved
Feb 12, 2026
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Microsoft
Medium
Software Engineer Locked

Find maximum collinear points

This question evaluates understanding of planar geometry and algorithmic reasoning for identifying collinearity, including handling duplicate points a...

Coding & Algorithms
6
0
100 people solved
Feb 12, 2026
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Microsoft
Hard
Software Engineer Locked

Find minimum moves to solve the 15-puzzle

This question evaluates understanding of state-space search, heuristic reasoning, and solvability analysis for combinatorial sliding puzzles, testing ...

Coding & Algorithms
2
0
41 people solved
Feb 11, 2026
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Microsoft
Hard
Software Engineer Locked

Assemble async stream reads into objects

This question evaluates a developer's skill in asynchronous stream I/O, buffer management, and binary parsing in C#, including correctly handling part...

Coding & Algorithms
6
0
45 people solved
Feb 11, 2026

Frequently Asked Questions

How difficult are Microsoft Coding & Algorithms interview questions?
Microsoft Coding & Algorithms questions typically span easy to hard difficulty, with most technical rounds focusing on medium-to-hard problems that test algorithmic thinking under time pressure. Interviewers expect clear reasoning, correct edge-case handling, and reasonably optimized solutions; for mid-level roles you’ll often see medium problems emphasizing arrays, strings, trees, and hashing, while senior candidates face harder dynamic programming, graph, and design-of-algorithm challenges. The difficulty also depends on role level and domain: applied research or specialized teams may ask deeper algorithmic proofs or complexity trade-offs. Expect to demonstrate both correctness and thoughtfulness about performance.
Where in the Microsoft interview process do Coding & Algorithms questions appear, and how is the process structured?
Coding & Algorithms questions appear throughout Microsoft’s screening pipeline: they commonly show up in the online assessment and technical phone screen, and they dominate multiple rounds of the onsite or virtual onsite loop. A typical structure begins with a recruiter screen, then an online coding assessment or technical phone interview that evaluates problem solving in a shared editor, followed by a series of one-hour interviews where 2–4 coding rounds are interleaved with design and behavioral conversations. For senior roles, expect algorithmic depth in coding rounds and algorithmic reasoning to surface during system or design discussions.
How long should I prepare for Microsoft Coding & Algorithms interviews — what timeline works best?
A practical preparation timeline is usually 6–12 weeks of focused practice for most mid‑level candidates, with adjustments based on background and target level. Start with a diagnostic week to identify weak areas, then spend 4–6 weeks building breadth across arrays, strings, trees, graphs, and DP, followed by 1–2 weeks of timed mock interviews and editor practice to simulate real sessions. If you’re aiming for senior roles, add several weeks for advanced algorithmic problems and technical communication drills. Consistent daily practice with explanation and review beats last‑minute cramming.
What key subtopics within Coding & Algorithms should I focus on for Microsoft interviews?
Concentrate on data structures and algorithmic patterns that Microsoft interviewers commonly evaluate: arrays and strings, two‑pointer and sliding window techniques, hash maps and sets, linked lists, recursion and trees (including traversals), graph traversal and shortest paths, heaps, sorting and binary search, and dynamic programming. Equally important are complexity analysis, handling NULLs and corner cases, and writing clean, testable code in a collaborative editor without IDE aids. Practicing problem classification and translating requirements into efficient data models will help you move from a correct solution to an optimal, interview‑ready answer.
What standout tips and common pitfalls should I know when preparing for Coding & Algorithms at Microsoft?
Standout tips include always clarifying requirements and constraints before coding, proposing multiple solutions with trade‑offs, and communicating your thought process clearly while writing concise, readable code. Practice in a plain collaborative editor to mimic interview conditions and time yourself on medium and hard problems. Common pitfalls are diving into implementation without confirming edge cases, failing to analyze time and space complexity, not testing with representative inputs, and overcomplicating solutions when a simpler approach suffices. Remember to verbalize assumptions and to iterate when you get feedback from the interviewer.

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