Software Engineer Coding & Algorithms Interview Questions
Practice 2,743 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."
Determine Whether a Word Transformation Exists
Given a beginWord, an endWord, and a list of valid words wordList, determine whether it is possible to transform beginWord into endWord. Rules: - Each...
Build a Tic-Tac-Toe App
Implement a simple Tic-Tac-Toe mobile app that can be completed in a 45-minute coding interview. Requirements: - Display a 3x3 board. - Support two lo...
Solve string transform and min-move sorting
This two-part problem evaluates string manipulation and algorithmic problem-solving competencies, specifically rule-based text transformation and comp...
Compute unique-substring length and first unique index
This question evaluates proficiency in string processing and character-frequency reasoning by combining tasks that measure longest distinct-character ...
Find k-th smallest subarray sum
This question evaluates algorithmic problem-solving skills in array processing, specifically understanding of subarray sum properties, selection and r...
Solve linked list, grid BFS, and median queries
This multi-part question evaluates proficiency in in-place linked list manipulation, reasoning about shortest connections between connected components...
Find when failures started in log stream
This question evaluates understanding of monotonic sequences and search algorithms (such as binary search), along with algorithmic reasoning about cor...
Compute nearest gate distance in grid
This question evaluates grid traversal, distance propagation, obstacle handling, and in-place matrix update competencies within the Coding & Algorithm...
Find all dictionary words in a grid
This question evaluates skills in grid traversal, string-search and pattern-matching techniques, recursive backtracking, and the efficient use of data...
Remove adjacent duplicates and handle tree input
This question evaluates string-processing and tree-construction skills, including efficient removal of adjacent or k-sized duplicate groups in strings...
Filter ads by a single rule
This question evaluates understanding of rule-based filtering for a single-rule ad filter, including set containment for locations, numeric range chec...
Solve two grid problems (islands + min-cost path)
This pair of problems evaluates grid-based algorithm competencies, specifically connected-component detection and translation-invariant shape recognit...
Find earliest time all riders become connected
This question evaluates graph connectivity and dynamic event-processing skills, testing conceptual understanding of connectivity in undirected graphs ...
Determine whether a word exists in a letter grid
This question evaluates algorithmic problem-solving and implementation skills in grid-based search, including concepts like graph traversal and backtr...
Check if one string is a subsequence of another
This question evaluates understanding of string algorithms and subsequence detection, focusing on sequence traversal, edge-case handling, and time/spa...
Count business days excluding holidays
This question evaluates proficiency in date and calendar arithmetic, handling set-based exclusions (holiday lists), and reasoning about algorithmic ef...
Compute distance-sum from every tree node
This question evaluates understanding of tree and graph algorithms, including computation of pairwise distances and techniques for aggregating path le...
Find path between nodes in Fibonacci tree
This question evaluates understanding of recursive tree structures, preorder indexing, implicit tree representations, algorithmic reasoning about node...
Design an autocomplete suggestions API
This question evaluates understanding of string-oriented data structures (e.g., prefix trees/tries), ranked retrieval and dynamic updates, testing ski...
Implement chance of a personal best
You are given a simplified model for tracking race times on an obstacle course. - A course has a fixed number of obstacles. - A run records the time s...