Coding & Algorithms Interview Questions
Practice 3,469 real Coding & Algorithms interview questions for 2026. Covers companies like Meta, Amazon, Google, Uber, and Microsoft. Real questions from actual interviews with detailed solutions — ideal for focused interview preparation. Coding & Algorithms interview questions are the single most common technical gate for software engineering roles and are used to evaluate problem framing, algorithm selection, complexity trade-offs, correctness, edge-case reasoning, and clear communication under time pressure. Expect this category to appear in early technical screens and repeatedly across onsite loops at companies that weight it heavily (notably Meta, Google, and Amazon). Interviews will test arrays and strings, trees and graphs, dynamic programming, hashing and two‑pointer techniques, and the candidate’s ability to test and optimize code in a shared editor. Prepare with timed mock interviews, practice in the same editor you’ll use live, and build a progressive schedule that moves from fundamentals to medium/hard problems; typical candidates invest several weeks to a few months of focused practice depending on seniority and target company.
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"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Implement Text Layout and Query Parsing
This question evaluates string-processing and parsing competencies, covering tokenization, constrained line-wrapping and layout decisions (including p...
Analyze sales with groupby
You are given three pandas DataFrames representing a food delivery marketplace: - orders(order_id, product_id, quantity, unit_price, status) - product...
Infer Generic Return Types
This question evaluates understanding of type systems, generic unification, recursive data structures, substitution mechanics, and robust error handli...
Decode an anagram sentence using vocabulary constraints
You are given: - vocab: a list of lowercase words (the "dictionary") - s: a string containing space-separated scrambled words Each scrambled word in s...
Compute buffet revenue with capacity and waiting
A casino buffet has a maximum capacity capacity (number of customers that can be seated at once). You are given: 1) prices: an array where prices[i] i...
Decrypt a twice-encrypted message using known pairs
Three people pass notes A → B → C → A. Notes are encrypted using a character-substitution cipher (a one-to-one mapping per character). You are given t...
Return dictionary words matching a prefix
You are given a list of strings words (a dictionary) and a string prefix. Return all words in words that start with prefix. Clarifications/constraints...
Compute Driver Pay with Double-Pay Windows
You are building payroll logic for a delivery platform. Given a list of order records for one delivery driver, compute the total amount the driver sho...
Implement a News Publishing System with Topic Subscriptions and Delivery Limits
You are building the core delivery engine for a news publishing service. The service continuously receives news items, stores them, and — whenever a p...
Simulate Uniform(0,1) from random bits
Assume you have access to a function rand_bit() that returns 0 or 1 with equal probability and independent across calls. How would you generate a rand...
Aggregate loans and match repayments
This question evaluates the ability to aggregate transactional loan records and match repayment transactions to outstanding loans, testing competencie...
Board Simulation: Bottom-Insert Pieces with Uniform Row and Column Detection
Board Simulation: Bottom-Insert Pieces with Uniform Row and Column Detection You must simulate a 2-D game board with R rows and C columns. Each cell i...
Return Words Matching a Typed Prefix
Given words and a query prefix, return all words starting with that prefix in lexicographic order. Implement: `python def prefix_matches(words: list[s...
Implement Interview Coding Problems
Solve the following independent coding tasks from a new-grad software engineering interview. 1. Implement a hash map from scratch. - Support integer k...
Find safe travel intervals between planet influences
You are planning a space route along a one-dimensional line (the x-axis). You are given a list of planets. Each planet is represented by an integer pa...
Process Transactions and Compute Balances
This question evaluates a candidate's ability to implement stateful transaction processing, accurate integer bookkeeping across accounts and currencie...
Count Nodes Using Asynchronous Messages
You are given the identifier of a root node in a distributed network. Each node represents a separate machine. A node cannot directly inspect another ...
Find the First Unique Log
This question evaluates a candidate's ability to analyze and implement efficient data-processing and frequency-detection strategies on ordered string ...
Solve several coding interview problems
This set of problems evaluates proficiency in string processing and combinatorial parsing, arbitrary-precision arithmetic using string representations...
Implement lexicographically smallest Two Sum
You are given an unsorted integer array nums and an integer target. Return the indices [i, j] (0-based) such that i < j and nums[i] + nums[j] == targe...