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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Count non-decreasing arrays by digit sums
You are given an array required_sums of length n. Count how many non-decreasing arrays result[1..n] of integers satisfy all of the following: ( 1) for...
Build a time-based key-value store
Problem Design a data structure that stores multiple values for the same key at different timestamps, and can retrieve the most recent value as of a g...
Solve two-pointer, sliding-window, and string tasks
Solve the following three coding tasks: 1) Two-pointer in-place de-duplication: Given a non-decreasing integer array nums and an integer k >= 1, modif...
Find longest substring without repeating characters
Problem Given a string s, return the length of the longest contiguous substring that contains no repeated characters. Input - s: a string (may contain...
Merge overlapping intervals
You are given an array of intervals, where each interval is represented as a pair of integers [start, end] with start <= end. The intervals may be uns...
Compute distance of each node to a cycle
Problem You are given an undirected graph with n nodes labeled 0..n-1 and a list of edges. The graph is connected and contains exactly one simple cycl...
Determine most popular concert city
Determine most popular concert city Given a set of concert venue vote records, determine which city is the most popular. How would you normalize city ...
Compute sum of longest positive subarray
Compute sum of longest positive subarray Given an integer array that may contain positive and negative numbers, find the sum of the longest contiguous...
Implement a generic tree Node class
Design and implement a Node class for a mutable rooted tree. Requirements: store value, parent, and ordered children; support add_child, remove, move_...
Compute discounted prices and full-price indices
You are given an array prices of length \(n\). Items are sold from left to right, and each item’s final selling price is computed as follows: For item...
Implement interval room counter and token manager
You are given two coding questions. 1) Minimum number of rooms for time intervals You are given a list of meetings, where each meeting is an interval ...
Extract stream prefix before stop token
You are consuming a text stream delivered as an iterator/generator of string chunks (each chunk may be any length, including empty). You are also give...
Solve budget queries and shortest path
1) Budgeted purchases with sorted array: You are given an array prices of n positive integers and q budget queries. For each budget B, you may buy ite...
Solve power jumps and graph tour
This online assessment contained two coding problems: 1. Minimum operations using signed powers of two Given an integer n, you want to make it equal...