Difficulty: How hard are Coding & Algorithms interview questions at top tech companies in 2026?

Coding & Algorithms questions span a wide range from quick easy problems to multi-stage hard puzzles; at big tech companies most live coding rounds land in the medium-to-hard band. Interviewers expect clean, correct solutions first, followed by optimized versions and rigorous complexity analysis. Depth matters: you’ll face follow-ups that push asymptotic limits, worst-case behavior, and space trade-offs. For senior levels expect novel combinations of data structures, proofs of correctness, and design-for-scale reasoning. Recent trends add AI-aware constraints—being able to use tools sensibly while demonstrating algorithmic intuition separates strong candidates from average ones.

Process and where this category appears: When and how is Coding & Algorithms evaluated, and which companies emphasize it?

Coding & Algorithms shows up at multiple stages: recruiter screens, timed online assessments, remote pair-coding rounds, and onsite loops. Companies you’re most likely to see heavy coding rounds at include Meta, Amazon, Google, Uber, and TikTok, though the exact format and emphasis vary. Google and Amazon traditionally keep a high DSA bar in early loops, Meta pilots AI-assisted coding rounds, Uber often uses competitive-programming-style problems, and TikTok favors speed plus practical constraints. Expect coding questions to gate progression early for IC roles, while cross-functional or product-heavy roles may move algorithm interviews later or weight them differently.

Preparation timeline: How should I plan my study schedule to cover 3,013 Coding & Algorithms questions effectively before interviews?

Treat 3,013 questions as a catalog, not a checklist. Build a focused 8–12 week plan that cycles between learning patterns, deliberate practice, and mock interviews. Start with core patterns and data structures for three weeks, practicing medium problems daily and reviewing solutions. Months two and three should include timed problem sets, mixed-topic mocks, and targeted weak-spot remediation, plus at least one weekly pair interview. Reserve final weeks for systematizing complexity analysis, writing clean code under time pressure, and rehearsing follow-ups. Regularly review incorrect solutions and categorize mistakes; quality of reflection beats raw question count.

Key subtopics: Which algorithm and data-structure areas are most often tested within Coding & Algorithms?

Expect questions across arrays and strings, hash tables, two-pointers, sliding windows, stacks and queues, heaps, trees and tries, graphs (BFS/DFS, shortest paths), dynamic programming, greedy algorithms, and union-find. Advanced topics include segment trees, suffix arrays, bit manipulation, amortized analysis, and probabilistic reasoning. Equally important are complexity trade-offs, memory constraints, and edge-case handling like NULL/empty inputs and integer overflow. Interviewers also evaluate pattern recognition—mapping a problem to a known technique—and the ability to generalize a working solution into optimized variants or proofs of correctness.

Standout tips and common pitfalls: What separates strong performers from weak ones in Coding & Algorithms interviews?

Top performers clarify requirements up front, outline a plan, and deliver a correct, readable solution before optimizing. They articulate time/space complexity, defend trade-offs, and handle tricky edge cases and tests. Use consistent naming, incremental testing, and explain how you’d scale or adapt the approach. Common pitfalls include premature optimization before correctness, ignoring input constraints, poor communication, skipping tests, and getting stuck on implementation details without stepping back. Over-reliance on memorized templates or blindly trusting AI-generated code without verification also costs candidates time and credibility in 2026 interviews.

Coding & Algorithms Interview Questions (Updated 2026) — Page 81

Coding & Algorithms Interview Questions

Practice 3,013 real Coding & Algorithms interview questions for 2026. Coding & Algorithms interview questions for top tech firms like Meta, Amazon, Google, Uber, and TikTok — real questions from actual interviews with detailed solutions — to power your interview preparation. This collection is sharply focused on algorithmic patterns (arrays, strings, sliding windows, trees/graphs, dynamic programming, greedy, two-pointers, and hashing), clean, review-ready code, and the explanation skills that distinguish hires. In 2026 expect familiar medium-to-hard problems plus newer twists: AI-enabled or multi-file coding rounds at some companies, more emphasis on explainability and edge-case reasoning, and occasional real-world performance constraints (streaming, concurrency, memory limits). Interviewers evaluate problem framing, algorithm choice, complexity trade-offs, test-case thinking, and communication under time pressure. Best prep mixes pattern-based practice, timed mock interviews, code-review style polishing, and rehearsed explanations of complexity and tradeoffs. Focus your last-mile prep on writing correct, readable code quickly and on explaining why your solution is robust and efficient for production scenarios.

Questions

3.0k

Companies

340

Updated

06.24.2026

3.0k Questions 340 Companies06.24.2026

PLTCHK

"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"

_The_TaNk_

"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"

ChrisSenior SWE, LinkedIn

"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."

sleepy33

"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."

JakeSenior ML Engineer, Lyft

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

nuggetlord

"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

AndySWE-II, Google

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

couchpotato99

"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."

ShrutiData Engineer, Salesforce

"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."

midnightramen

"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."

BiancaFrontend Eng, Figma

"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."

tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa

"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."

PLTCHK

_The_TaNk_

ChrisSenior SWE, LinkedIn

"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."

sleepy33

"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."

JakeSenior ML Engineer, Lyft

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

nuggetlord

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

AndySWE-II, Google

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

couchpotato99

"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."

ShrutiData Engineer, Salesforce

"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."

midnightramen

"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."

BiancaFrontend Eng, Figma

"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."

tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa

"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."

Showing 20 results

Role

Databricks

Medium

Software Engineer

Implement run-length encoding and decoding

You are given a string consisting of lowercase English letters. You need to implement run-length encoding (RLE) and its corresponding decoding. 1. Enc...

Coding & Algorithms Interview Questions

Implement run-length encoding and decoding

Find Highest Product Segment

Return top-k subset sums in descending order

Count numbers with same popcount up to all-ones bound

Build Friend Recommendations

Return Top K Relevant Apps

Expand algebraic expression with distribution

Implement Card Validation and Recovery System

Identify Overlapping Sessions and Optimize Coverage

Find largest digit-sharing subset

Parse API JSON and print org chart

Answer four array/time/grid query questions

Add two integer strings using digit-adder

Calculate transaction fees from CSV records

Minimize travel time with optional meeting point

Apply commands to transform a matrix

Design late-tolerant streaming window aggregator

Solve stock, BFS path, and merge intervals

Solve subset-count and kth-factor problems

Implement streaming CTR with deduplication

Frequently Asked Questions