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Add missing type hints to hill_climbing.py#14260

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anandvenugopal-tech wants to merge 5 commits intoTheAlgorithms:masterfrom
anandvenugopal-tech:anandvenugopal-tech-patch-1
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Add missing type hints to hill_climbing.py#14260
anandvenugopal-tech wants to merge 5 commits intoTheAlgorithms:masterfrom
anandvenugopal-tech:anandvenugopal-tech-patch-1

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@anandvenugopal-tech anandvenugopal-tech commented Feb 8, 2026

This PR adds missing type hints to searches/hill_climbing.py.

  • Added type annotation for function_to_optimize (Callable[[int, int], int])
  • Added return type hints to get_neighbors, hash, eq, and str
  • Added missing type hint for search_prob in hill_climbing()
  • Followed modern Python typing (PEP 585)

Improves readability and typing consistency across the repository.

Describe your change:

  • Add an algorithm?
  • Fix a bug or typo in an existing algorithm?
  • Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
  • Documentation change?

Checklist:

  • I have read CONTRIBUTING.md.
  • This pull request is all my own work -- I have not plagiarized.
  • I know that pull requests will not be merged if they fail the automated tests.
  • This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
  • All new Python files are placed inside an existing directory.
  • All filenames are in all lowercase characters with no spaces or dashes.
  • All functions and variable names follow Python naming conventions.
  • All function parameters and return values are annotated with Python type hints.
  • All functions have doctests that pass the automated testing.
  • All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
  • If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

This commit adds the missing type annotations to searches/hill_climbing.py.

- Added type annotation for function_to_optimize using Callable [[int, int], int]
- Added return type hints to get_neighbors, __hash__, __eq__, and __str__
- Added missing type hint for search_prob in hill_climbing()
- Improved type clarity while preserving existing logic
- Used modern Python type hints (PEP 585)

This improves readability and typing consistency across the repository.
@algorithms-keeper algorithms-keeper bot added enhancement This PR modified some existing files awaiting reviews This PR is ready to be reviewed labels Feb 8, 2026
@algorithms-keeper algorithms-keeper bot added the tests are failing Do not merge until tests pass label Feb 8, 2026
@algorithms-keeper algorithms-keeper bot removed the tests are failing Do not merge until tests pass label Feb 8, 2026
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Left a suggestion regarding the type hints for the objective function.

x: int,
y: int,
step_size: int,
function_to_optimize: Callable[[int, int], int],
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Nice work adding these hints!

I have one suggestion regarding function_to_optimize: Currently, it is typed to return an int (Callable[[int, int], int]). However, in optimization problems, objective functions very often return float values (costs, fitness scores, etc.).

Restricting it to int might flag valid use cases as errors. Would it be safer to type it as Callable[[int, int], float] or Callable[[int, int], int | float]?

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Thanks for the update!

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llukito commented Feb 8, 2026

The CI failure confirms that the int | float change is correct, but we missed the return type hint for the score() method (or whichever method is at line 42).

You just need to update that method's return annotation to -> int | float so it matches the input function.

Mypy reported an incompatible return type because function_to_optimize may return float values. 
Updated score() return type from int to int | float for full compatibility.
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Thanks for the suggestion!
I’ve updated the return type of score() to support int | float so it aligns with the updated type hint for function_to_optimize.
All checks have now passed. Please let me know if anything else is needed.

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