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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Implement Memory Allocation and In-Memory Records
Solve the following two implementation problems. Problem A: First-Fit Memory Allocator You are given a contiguous block of memory containing n units, ...
Return a topological ordering of a graph
Problem: Output a topological ordering Given a directed graph with n nodes labeled 0..n-1 and a list of directed edges edges, return a topological ord...
Rotate a 3×3 digit grid by 180°
Problem You are given a 3×3 grid of digits (characters '0'–'9'), represented as an array of 3 strings of length 3. When the entire grid is rotated by ...
Implement lower_bound on unknown-size sorted array
Lower Bound in Unknown-Length Nondecreasing Array via API Setup You are given a non-decreasing integer array A of unknown length n. You cannot access ...
Implement SQL Table and DNA Ordering
Two independent coding exercises were asked. Solve both. Problem A: CSV-backed in-memory table Build a tiny in-memory relational table initialized fro...
Decode a JWT string without libraries
Implement a function that decodes (but does not necessarily verify) a JWT token. A JWT is a string of the form: ` <base64url(header)>.<base64url(paylo...
Compute product of array except self
Problem Given an integer array nums of length n, return an array ans of length n where: - ans[i] = (nums[0] nums[1] ... nums[i-1] nums[i+1] ... ...
Implement a calendar with non-overlapping bookings
Problem Design a calendar booking system that stores half-open time intervals [start, end) (inclusive of start, exclusive of end). Implement a class w...
Check palindrome number and next palindrome
Problem You are given a non-negative integer n. 1. Determine whether n is a palindrome in base-10 (it reads the same forward and backward). 2. Follow-...
Design a Versioned Key-Value Store
Implement a data structure for storing values by key over time. The structure should support these operations: - put(key, value, timestamp): Store the...
Solve four classic algorithm problems
You are given four independent coding tasks. For each task, implement the required function. --- Problem 1: Zigzag level-order traversal of a binary t...
Implement idempotent request handling with idempotency keys
Problem You are implementing an API endpoint (e.g., POST /charge) that must be idempotent using an Idempotency-Key. Design and implement an in-memory ...
Maximize profit with bounded sell window
Given an array prices[0..n-1] of daily stock prices and an integer D ≥ 1, you may perform at most one transaction (buy then sell). The sell day j must...
Answer common graph, grid, and array tasks
Problem 1: Largest continuous island after filling sea (1D) Humans can convert ocean cells into land by filling them. Input - islands: a 1D array of l...
Implement K-Means and Detect Divisible Subarrays
Solve both coding tasks. Part A: Implement K-Means Clustering Implement K-means clustering for a set of points. Given: - points: a list of n points, w...
Sort Three Categories In Place
You are given an array items containing only the values 0, 1, and 2, where each value represents a category. Rearrange the array in-place so that all ...
Solve Throughput, Rate Limiting, and LFU
The interview included the following coding tasks: 1. Minimum processing speed: You are given an array piles, where piles[i] is the size of the ith pi...
Implement Calendar, Tokenizer, and Meeting Optimizer
Implement the following three coding tasks. 1. Calendar insertion check You are given a list of existing calendar events, where each event is a hal...
Implement SFT Sample Packing
Implement a preprocessing function for supervised fine-tuning data for an autoregressive language model. You are given a list of tokenized training sa...
Remove duplicates in-place from unsorted array
Problem You are given an array nums of unsorted integers. Write a method that removes duplicates in-place (i.e., without using any additional data str...