[bugfix]: absolute value and typo

[anencore94]

Signed-off-by: Jaeyeon Kim anencore94@gmail.com
Co-authored-by: Seongjin Kim seongjinkim1123@gmail.com

What this PR does / why we need it:

1. There was a bug when handling odd number of parameters with negative step. For above example, the number of combination should be 64, not -62.
2. minor typo

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Checklist:

• Docs included if any changes are user facing

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[anencore94]

@googlebot I consent.

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We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

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[gaocegege]

/assign @andreyvelich

[seong7]

@googlebot I consent.

[andreyvelich]

Nice catch @anencore94!
/lgtm
/assign @kimwnasptd

[kimwnasptd]

The change looks good, thanks @anencore94!

/lgtm

[andreyvelich]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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