Software Engineer Coding & Algorithms Interview Questions
Practice 2,712 real Coding & Algorithms interview questions for Software Engineer roles. From companies including Meta, Amazon, Google, Uber, Microsoft.
"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"
"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"
"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."
"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."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"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."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"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."
Compute Edit Distance
Compute Edit Distance Given two strings, return the minimum number of single-character operations needed to transform the first string into the second...
Implement string formatting and request tracking tasks
This multi-part question evaluates string manipulation, numeric formatting, character-mapping validation under 180° rotation, and event-tracking/order...
Convert Stack Samples into Trace Events
Convert Stack Samples into Trace Events The source reports converting sampled call stacks into trace events but does not provide the exact tuple forma...
Collect Pins from Reachable Boards
Collect Pins from Reachable Boards The interview report names a board-and-pin coding problem whose intended approach was breadth-first search but does...
Courier Delivery Cost Tracker
This question evaluates a candidate's ability to design a stateful, multi-part class that combines interval tracking with incremental balance accounti...
Settle debts with minimal transactions
You are given a list of debts among a set of people, expressed as triples (debtor, creditor, amount) (equivalently (payer, payee, amount)), where each...
Three Array Problems for Trading Geometry and Grouping
Problem Implement solve(prices, numbers, people, group_size) and return an object with three fields. 1. max_profit: the maximum profit from buying onc...
Group Events by an Ordered Attribute List
Group Events by an Ordered Attribute List Problem Implement groupEventCounts(fieldNames, events, groupBy) -> resultJson. Each row in events is a porta...
Compute the Median After Each Stream Insertion
Compute the median after every insertion into an integer stream without repeatedly sorting the full prefix. Practice maintaining balanced data structu...
Check Whether Two Strings Are Anagrams
Problem Implement are_anagrams(a, b). Return true exactly when a and b contain the same lowercase English letters with the same multiplicities, possib...
Implement an in-memory SQL-like table
Implement a simplified in-memory SQL-like database for a single table. You should support the following operations on a table with a fixed schema (a l...
Calculate Streaming Token Usage Costs
Calculate Streaming Token Usage Costs Implement a usage calculator for language-model API requests. Input and output tokens have different prices, and...
Detect Recent Duplicate Records with Bounded Memory
Detect Recent Duplicate Records with Bounded Memory A time-ordered stream contains records [id, text, title, timestamp]. Detect records whose exact (t...
Simulate room assignments for scheduled meetings
This question evaluates scheduling and event-simulation skills, including time-ordered processing, resource allocation with tie-breaking, and efficien...
Collapsible Code Editor: Brace Matching and Toggle
This question tests stack-based parsing and stateful data structure design through a two-part brace-matching and collapsible editor problem. It evalua...
Find A Threshold-Limited Path With Minimum Required Safety
You are given an undirected graph with n nodes, a list of weighted edges, a start node, an end node, and a safety threshold. Each edge has a safety co...
Implement buffered file writer with concurrency support
You are given a simple file writer class that writes data directly to disk: `cpp class FileWriter { public: // Append data to the file on disk imm...
Implement a Byte Pair Encoding (BPE) Tokenizer
This question evaluates practical understanding of tokenization algorithms and string processing, specifically the iterative merge-based approach used...
Count Requests Dropped by Multiple Time Windows
Count Requests Dropped by Multiple Time Windows Implement count_dropped(timestamps) for nondecreasing integer seconds. For zero-based request index i,...
Compress Consecutive Characters with Run Lengths
Compress Consecutive Characters with Run Lengths Implement compress_runs(s) and return the compressed string. The input contains ASCII letters only. S...