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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"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
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"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"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."
Solve meeting-room scheduling and shortest paths
This question evaluates proficiency in interval scheduling and resource allocation as well as shortest-path computation in weighted directed graphs, e...
Design a rolling hit counter API
This question evaluates proficiency with data structures for time-window aggregation and understanding of time/space trade-offs when counting events w...
Find linked user records by weighted similarity
This question evaluates skills in similarity-based record linkage, weighted field scoring, and graph connectivity analysis within the Coding & Algorit...
Verify business accounts with progressive KYC rules
This question evaluates skills in string parsing, text normalization, rule-based validation, and token-based string matching within a KYC verification...
Solve Triangle Rows and Top Frequencies
You have 1 hour to solve both coding problems. Problem 1: Build an Additive Number Triangle Given an integer numRows, return the first numRows rows of...
Implement Concurrent Any-True Shot
This question evaluates proficiency in concurrent programming, focusing on coordination, synchronization, early termination, and best-effort cancellat...
Compute Products Excluding Each Index
You are given an integer array nums of length n. Return an array answer such that answer[i] equals the product of every element of nums except nums[i]...
Implement Buffer Parsers and Generic Map Class
This question evaluates proficiency in low-level C++ buffer parsing, memory and pointer management, safe binary deserialization, and template-based ge...
Approximate Pi from Random Points
You are given an array pts of points in the unit square. Each point is represented as an array of two numbers [x, y], where 0 <= x <= 1 and 0 <= y <= ...
Validate Bracket Sequence
This question evaluates proficiency with stack data structures, string parsing and matching logic, and the ability to reason about algorithmic time an...
Minimize maximum height along a grid path
This question evaluates algorithmic pathfinding and graph-modeling skills, specifically reasoning about grid-based route selection where the objective...
Find the Longest Palindromic Substring in Linear Time
Find the Longest Palindromic Substring in Linear Time Implement longest_palindrome(s) and return the longest contiguous palindromic substring. If seve...
Implement a CSAT Sliding Window Tracker
Design and implement a class that tracks customer satisfaction scores over a sliding time window. A customer support conversation has: - conversation_...
Implement a Batch Image Processor
This question evaluates a candidate's competency in image processing operations and parallel/concurrent programming, covering basic transformations (g...
Can board states be transformed?
This question evaluates reasoning about constrained piece movement, string transformation, and invariant-based correctness in the Coding & Algorithms ...
Schedule Ready Tasks by Deadline
You are building a workflow scheduler. Each task has: - a unique task_id - an integer deadline - an optional list of prerequisite tasks that must be c...
Implement a longest-match tokenizer
This question evaluates string-processing and algorithmic implementation skills for greedy longest-match tokenization, including handling runs of unma...
Find optimal commute mode in a city graph
You are designing a route planner that suggests the best way to commute between two points in a city using different transportation modes. The city is...
Maximum Profit from Multi-Stock Trading Records
Maximum Profit from Multi-Stock Trading Records You are given a list of stock price records collected from a trading feed. Each record is a triple: - ...
Compute longest increasing subsequence length
This question evaluates understanding of sequence analysis and algorithmic problem solving, assessing competency with subsequences, reasoning about co...