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Code review fixes for 5 oldest code files#14566

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JiayangLai wants to merge 1 commit intoTheAlgorithms:masterfrom
JiayangLai:code-review-fix-5-oldest-files
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Code review fixes for 5 oldest code files#14566
JiayangLai wants to merge 1 commit intoTheAlgorithms:masterfrom
JiayangLai:code-review-fix-5-oldest-files

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Summary

Code review and fixes for the 5 oldest Python files in the repository (based on last modification date):

  1. searches/sentinel_linear_search.py (last modified: 2020-03-04)

    • Added return type annotation (int | None)
    • Fixed input mutation bug - function was modifying the input sequence
  2. data_structures/disjoint_set/alternate_disjoint_set.py (last modified: 2020-08-28)

    • Fixed type hint from list to list[int]
    • Removed unused max_set attribute
  3. searches/double_linear_search_recursion.py (last modified: 2020-09-18)

    • Fixed mutable default argument bug (right: int = 0 -> right: int | None = None)
    • Added return type annotation
  4. searches/double_linear_search.py (last modified: 2020-09-23)

    • Added empty array handling to prevent IndexError
    • Added doctest for empty array case
  5. strings/remove_duplicate.py (last modified: 2020-09-24)

    • Clarified docstring to accurately describe behavior (output is sorted alphabetically, not in original order)

Test plan

All doctests pass:

  • python -m doctest searches/sentinel_linear_search.py
  • python -m doctest searches/double_linear_search.py
  • python -m doctest searches/double_linear_search_recursion.py
  • python -m doctest strings/remove_duplicate.py

🤖 Generated with Claude Code

- sentinel_linear_search.py: Add return type annotation, fix input mutation bug
  by creating a copy instead of modifying the original sequence

- double_linear_search.py: Add empty array handling to prevent IndexError

- alternate_disjoint_set.py: Fix type hint (list -> list[int]), remove unused
  max_set attribute

- double_linear_search_recursion.py: Fix mutable default argument bug by using
  None as default and initializing inside the function

- remove_duplicate.py: Clarify docstring to accurately describe behavior
  (output is sorted, not in original order)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@algorithms-keeper algorithms-keeper bot added the tests are failing Do not merge until tests pass label Apr 19, 2026
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