Representative Backtracking problems
Generate all letter combinations a digit string can represent using backtracking with pruning, leveraging hash table mapping efficiently.
Open problem page#22 Generate ParenthesesGenerate Parentheses requires generating all valid combinations of parentheses with given pairs using backtracking and state transition.
Open problem page#37 Sudoku SolverSolve the Sudoku puzzle by filling empty cells while respecting Sudoku's rules using array scanning and backtracking.
Open problem page#39 Combination SumFind all unique combinations of numbers from a distinct array that sum to a target using controlled backtracking search.
Open problem page#40 Combination Sum IIFind all unique combinations of numbers that sum to a target using backtracking with careful pruning to avoid duplicates.
Open problem page#46 PermutationsGenerate all possible orderings of a distinct integer array using backtracking search with careful pruning to avoid duplicates.
Open problem page#47 Permutations IIGenerate all unique permutations of an array containing duplicates using backtracking and pruning to avoid repeated sequences efficiently.
Open problem page#51 N-QueensSolve the N-Queens problem using backtracking with pruning, exploring all valid board placements while avoiding conflicts efficiently.
Open problem page#52 N-Queens IISolve the N-Queens II problem using backtracking with pruning to efficiently count all valid placements for n queens on a chessboard.
Open problem pageBacktracking 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 Backtracking Matters In Coding Interviews
Interviewers rarely care about the label alone. They care about whether you can recognize when the Backtracking 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
- Backtracking search with pruning
- State transition dynamic programming
- Array scanning plus hash lookup
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 Backtracking 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 Backtracking 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 Backtracking topic usually test in interviews?
Backtracking 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 Backtracking 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 Backtracking group?
This topic page currently groups 88 indexed GhostInterview problem pages under the Backtracking family.
Should I practice this topic before harder patterns?
That depends on your current gaps. If Backtracking 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 Backtracking 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 Backtracking 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.