Representative Simulation problems
Multiply Strings requires simulating integer multiplication using only string operations without direct numeric conversion or BigInteger libraries.
Open problem page#54 Spiral MatrixGiven an m x n matrix, return all elements in spiral order starting from the top-left corner.
Open problem page#59 Spiral Matrix IIGenerate a spiral matrix of size n x n, filled with elements from 1 to n² in spiral order, for interview-focused solving.
Open problem page#67 Add BinaryAdd Binary involves summing two binary strings and returning the result as a binary string using math and string manipulation.
Open problem page#68 Text JustificationText Justification requires packing words into lines to match a specified width, ensuring even distribution of spaces.
Open problem page#258 Add DigitsAdd Digits involves repeatedly summing digits of a number until a single digit is obtained.
Open problem page#289 Game of LifeSolve the Game of Life by updating each cell based on its eight neighbors using Array and Matrix simulation patterns efficiently.
Open problem page#412 Fizz BuzzGenerate a list from 1 to n replacing multiples of 3 with Fizz, 5 with Buzz, and both with FizzBuzz efficiently.
Open problem page#415 Add StringsGiven two non-negative integers as strings, sum them and return the result as a string without converting to integers directly.
Open problem pageSimulation interview questions usually collapse into a small set of repeatable moves. This page groups those GhostInterview problem pages together so you can stay inside one pattern family, compare representative questions, and practice explanations that transfer across multiple prompts. If you are trying to sharpen one interview weakness instead of browsing the entire library, start here.
Why Simulation Matters In Coding Interviews
Interviewers rarely care about the label alone. They care about whether you can recognize when the Simulation pattern applies, explain why it applies, and avoid the failure modes that usually show up under time pressure. That is why this page focuses on the family of problems rather than a single isolated example.
Pattern families that show up here
- Array plus Simulation
- Array scanning plus hash lookup
- Array plus Matrix
Use this page to narrow the session
Start from this topic hub, choose one or two representative problems, and then open the detailed problem pages only after you know which version of the pattern you want to reinforce.
How To Practice This Topic
The best workflow is to keep the prep block narrow. Pick one easy or medium problem to confirm the base pattern, then one medium or hard problem to test whether the explanation still holds when the constraints tighten. Once the logic is stable, move into GhostInterview to rehearse the live explanation flow.
Focus on transfer, not title count
Solving more Simulation titles is less useful than understanding how the same move changes across examples. Try to describe what stays the same and what changes from one problem to the next.
Use the problem page when you want the exact breakdown
This topic hub is the discovery layer. The single-problem pages are where you get the answer-first summary, examples, constraints, approach, complexity, pitfalls, and solver CTA.
How GhostInterview Fits
GhostInterview works best after you know which pattern family you are inside. Use this page to choose the right Simulation problem, then use the solver to get the answer path, complexity framing, and follow-up support without switching into a generic study flow.
FAQ
What does the Simulation topic usually test in interviews?
Simulation questions usually test whether you can spot the underlying pattern quickly, explain the trade-offs, and move from intuition to implementation without losing clarity.
How should I use this Simulation topic page?
Use it as a pattern hub. Start with the representative problems on this page, compare the common approach, and then open the exact problem page when you want the full breakdown.
How many GhostInterview problem pages are in the Simulation group?
This topic page currently groups 171 indexed GhostInterview problem pages under the Simulation family.
Should I practice this topic before harder patterns?
That depends on your current gaps. If Simulation is already a weak spot in interviews, it is usually better to stabilize it first before moving into more advanced or less frequent patterns.
Where does GhostInterview fit once I pick a Simulation problem?
The topic page narrows the pattern family. The problem page gives the exact breakdown. GhostInterview is the solver layer when you need direct help with execution, complexity, and follow-up handling.
Stay close to the same reasoning family
Need direct help once you choose a Simulation problem?
Use GhostInterview as the solver layer after you select the exact prompt. Capture the question, get the answer path and complexity framing, and keep the workflow inside the same topic family.