Representative Binary Search problems
Find the median of two sorted arrays using binary search for efficient O(log(min(m, n))) time complexity.
Open problem page#33 Search in Rotated Sorted ArrayFind the index of a target in a rotated sorted array using a careful binary search that handles pivot shifts.
Open problem page#34 Find First and Last Position of Element in Sorted ArrayLocate the first and last index of a target in a sorted array using binary search for precise O(log n) performance.
Open problem page#35 Search Insert PositionFind the correct index for a target value in a sorted array using binary search, or return the position where it should be inserted.
Open problem page#69 Sqrt(x)Solve the Sqrt(x) problem using binary search to find the integer square root of a number without built-in operators.
Open problem page#74 Search a 2D MatrixSearch a 2D matrix efficiently using binary search over its linearized index, ensuring correctness in row-major sorted arrays.
Open problem page#81 Search in Rotated Sorted Array IIDetermine if a target exists in a rotated sorted array that may contain duplicates using a binary search variation efficiently.
Open problem page#153 Find Minimum in Rotated Sorted ArrayFind the minimum element in a rotated sorted array using binary search to efficiently identify the point of rotation.
Open problem page#154 Find Minimum in Rotated Sorted Array IIFind the minimum in a rotated sorted array with possible duplicates using binary search.
Open problem pageBinary Search 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 Binary Search Matters In Coding Interviews
Interviewers rarely care about the label alone. They care about whether you can recognize when the Binary Search 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
- Binary search over the valid answer space
- Array scanning plus hash lookup
- State transition dynamic programming
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 Binary Search 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 Binary Search 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 Binary Search topic usually test in interviews?
Binary Search 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 Binary Search 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 Binary Search group?
This topic page currently groups 265 indexed GhostInterview problem pages under the Binary Search family.
Should I practice this topic before harder patterns?
That depends on your current gaps. If Binary Search 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 Binary Search 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 Binary Search 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.