Luhn algorithm #4487
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Luhn algorithm #4487
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Perform Luhn validation on input string
Algorithm:
* Double every other digit starting from 2nd last digit.
* Subtract 9 if number is greater than 9.
* Sum the numbers
https://en.wikipedia.org/wiki/Luhn_algorithm
ghost
added
the
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mypy typing doesn't support mutable static types. I won't be changing that. |
onlinejudge95
requested changes
Jun 10, 2021
Comment on lines
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| check_digit: int | ||
| _vector: List[str] = list(string) | ||
| __vector, check_digit = _vector[:-1], int(_vector[-1]) | ||
| vector: List[int] = [*map(int, __vector)] |
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We can remove the noise of extra variables with similar names here
tokens, check_digit = list(string), int(list(string)[-1])
vector: List[int] = list(map(int, tokens[:-1]))A variable declaration costs memory, so use it judicially
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mypy static checks doesn't pass when "the noise" isn't there
:)
onlinejudge95
approved these changes
Jun 13, 2021
|
Nice contribution !! |
shermanhui
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Oct 22, 2021
* Luhn algorithm
Perform Luhn validation on input string
Algorithm:
* Double every other digit starting from 2nd last digit.
* Subtract 9 if number is greater than 9.
* Sum the numbers
https://en.wikipedia.org/wiki/Luhn_algorithm
* Update DIRECTORY.md
* Update luhn.py
* Update luhn.py
* Update luhn.py
* Update luhn.py
* Update DIRECTORY.md
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Perform Luhn validation on input string
Algorithm:
* Double every other digit starting from 2nd last digit.
* Subtract 9 if number is greater than 9.
* Sum the numbers
https://en.wikipedia.org/wiki/Luhn_algorithm
Describe your change:
Checklist:
Fixes: #{$ISSUE_NO}.