The problem involves a linked list where each node has a next pointer and a child pointer. The child pointer points to a separate, sorted linked list. This algorithm recursively merges these lists into a single, fully sorted list connected by the child pointers.

I have readCONTRIBUTING.md.
This pull request is all my own work -- I have not plagiarized it.
All filenames are in PascalCase.
All functions and variable names follow Java naming conventions.
All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
All new code is formatted correctly.

This submission includes:
FlattenMultilevelLinkedList.java: The core implementation.
FlattenMultilevelLinkedListTest.java: A corresponding set of unit tests to ensure correctness.

All local tests pass successfully.

Priyanshu1303d requested review fromDenizAltunkapan,yanglbme andalxkm ascode owners

October 6, 2025 05:32

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codecov-commenter commentedOct 6, 2025•
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.47%. Comparing base (b1aa896) to head (a25b4c1).

Additional details and impacted files

@@             Coverage Diff              @@##             master    #6670      +/-   ##============================================+ Coverage     76.45%   76.47%   +0.01%- Complexity     5985     5993       +8============================================  Files           716      717       +1       Lines         20265    20286      +21       Branches       3929     3931       +2     ============================================+ Hits          15494    15514      +20- Misses         4180     4181       +1  Partials        591      591

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