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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Extract stream prefix before stop token
This question evaluates streaming string processing, incremental substring detection across chunk boundaries, and memory-efficient algorithm design fo...
Build a CSV Query Engine
This question evaluates proficiency in text parsing, data modeling, and implementing in-memory query semantics, including CSV parsing rules, type infe...
Compute distance of each node to a cycle
This question evaluates proficiency in graph algorithms, including understanding unicyclic graph structure, cycle identification, and computing minimu...
Validate a JSON-like string
This question evaluates parsing and string-processing skills, focusing on structural validation of JSON-like text including matching and nesting of br...
Check palindrome and find next larger palindrome
This question evaluates proficiency in string and numeric manipulation, specifically palindrome detection and generation of the next strictly larger n...
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...
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...
Find lowest common ancestor in tree
You are given the root of a binary search tree (BST) and two distinct nodes p and q that are guaranteed to exist in the tree. Task (BST case): - Find ...
Count integer pairs satisfying 1/x + 1/y = 1/N
You are given a positive integer N (\(1 \le N \le 10^6\)). Consider the Diophantine equation: \[ \frac{1}{x} + \frac{1}{y} = \frac{1}{N}, \] where x a...
Find shortest substring with n unique letters
Problem You are given a string s consisting of lowercase English letters and an integer n (1 ≤ n ≤ 26). Find the length of the shortest contiguous sub...
Merge multiple sorted arrays using min-heap
Problem You are given k sorted arrays of integers: - arrays[0], arrays[1], ..., arrays[k-1] - Each arrays[i] is sorted in non-decreasing order. - The ...
Reverse linked list in fixed-size groups
Problem You are given the head of a singly linked list and an integer k (k >= 1). Reverse the nodes of the list in-place in groups of size k: - The no...
Design cache with least-recently-used eviction
You are asked to design an in-memory key–value cache that supports a least-recently-used (LRU) eviction policy. The cache must support the following o...
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 ...
Reverse a list in-place
Coding Task: Reverse a List In-Place (Python) Context You're implementing a utility function during a technical screen. The function must reverse a Py...
Solve load balancing and perfect pairs
1) Contiguous load balancing: You have n identical resources (servers) and m ordered tasks with processing times burstTime[0..m-1]. Each server must b...
Count k for consecutive-sum generator
An array generator service produces a consecutive-integers array starting at a positive integer k: [k, k+1, ..., k+m−1] for some m ≥ 1. The service re...
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...
Solve binary-search knapsack & graph shortest path
Question Given a sorted list of items, design an efficient solution (using binary search) to achieve the target objective instead of a dynamic-program...
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...