Fixed windows warning (backport #1595)

[mergify]

🦟 Bug fix

Fixes #1593

Summary

std::distince might return a negative value depending on the indexes introduced, but in this case we are always using the begining of the iterator as the first argument. I assume that this will always positive and then the method can always return a unsigned int

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
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• All tests passed (See test coverage)
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This is an automatic backport of pull request #1595 done by [Mergify](https://mergify.com).

[mergify]

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