PYTHON PROBLEM 119 · Interview-Level

Count N-Queens solutions

Count valid arrangements on a 4-by-4 chessboard.

N-Queens · backtrackingN-Queensbacktracking

PROBLEM OVERVIEW

What this Python exercise asks you to practise

This scenario tests count n-queens solutions. It belongs to the Recursion and Backtracking roadmap and uses the n-queens · backtracking pattern.

Base cases, call stacks, recursive structure, choice trees, pruning, and undoing choices safely.

COMPLETE WORKSPACE

Learn the plan, trace the logic and run the solution

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SKILL TO CARRY FORWARD

Pattern relevance

This exercise strengthens n-queens · backtracking. Be ready to explain the input, the rule, the boundary cases, and why the chosen approach is appropriate.