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.

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Traverse an Org Chart by Level
You are given an organization's reporting structure as a flat list of employee-manager relationships. Exactly one employee is the root (the CEO) and h...
Return Top K Open Businesses
You are given a list of business candidates. Each candidate has at least the following fields: - score: a numeric relevance score - distance: a numeri...
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...
Answer suffix maximum-frequency queries
You are given: - An integer array nums of length n. - An integer array queries of length m, where each queries[k] is an index i (0-based) into nums. F...
Fill rooms with nearest-gate distance
You are given an m×n grid representing a building floor plan: - -1 = wall/blocked cell - 0 = gate - A large positive number (e.g., INF = 2^31-1) = emp...
Retain Top K Elements
Given a list of integers nums and an integer k, return a new list formed from the original list after removing every element except the k largest elem...
Build a CSV Query Engine
Implement a small in-memory CSV query engine. You are given CSV text where the first line contains column headers and each remaining line contains one...
Assemble DNA payload strings from tagged fragments
You are given a list of DNA-like fragments. Each fragment is a tuple: - start_tag: string - end_tag: string - payload: string A valid DNA chain is for...
Implement four data-structure/string geometry tasks
Problem A — Multiply two non-negative integer strings You are given two strings num1 and num2 representing non-negative integers in base-10. - Return ...
Find minimum cycle cost per node
Problem You are given a weighted directed graph with n nodes labeled 0..n-1 and m directed edges. Each edge is (u, v, w) meaning you can go from u to ...
Find Top K Largest Numbers
Given an unsorted array of integers nums and an integer k, return the k largest numbers in the array. The solution should use a heap rather than sorti...
Group GPUs by node and partition by links
Problem: GPU graph grouping and link-maximizing partition You are given a cluster of GPUs represented as a graph: - Each GPU has a unique gpuId and be...
Find minimum moves to solve the 15-puzzle
Problem Given a 4×4 sliding puzzle (the classic 15-puzzle), compute the minimum number of moves required to reach the solved state, or return -1 if it...
Compute and plot a precision–recall curve
You are given model outputs for a binary classifier: - y_true: an array of 0/1 ground-truth labels of length n. - y_score: an array of predicted score...
Assemble async stream reads into objects
You are implementing a parser in C# that reads a binary stream containing a sequence of records. An interviewer provides these helper functions (you m...
Find Top K Largest Elements
Given an unsorted integer array nums of length N and an integer k such that 1 <= k <= N, return the k largest elements in the array. If a value appear...
Implement rotated array binary search with duplicates
Given an integer array nums that is a non-decreasing array rotated an unknown number of times. Duplicates may exist. Implement a function that returns...
Solve cache, grid path, and substring problems
You are given three independent coding tasks. 1) Bounded cache with eviction Design a data structure that stores key–value pairs with a fixed capacity...
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); ...
Find pairs with the minimum absolute difference
Given an integer array (not necessarily sorted), find the minimum absolute difference between any two distinct elements. Return all pairs of values th...