PYTHON PROBLEM 240 · Interview-Level

Sort with merge sort: Duplicates and negatives

Preserve duplicates while ordering signed values.

merge sortmerge sort

PROBLEM OVERVIEW

What this Python exercise asks you to practise

This scenario tests sort with merge sort. It belongs to the Recursion and Backtracking roadmap and uses the merge sort 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 merge sort. Be ready to explain the input, the rule, the boundary cases, and why the chosen approach is appropriate.