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Optimization for shell sort #4038

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Merged
merged 3 commits into from
Dec 18, 2020
Merged

Optimization for shell sort #4038

merged 3 commits into from
Dec 18, 2020

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realDuYuanChao
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Describe your change:

  • Add an algorithm?
  • Fix a bug or typo in an existing algorithm?
  • 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 have a URL in its comments that points to Wikipedia or other similar explanation.
  • If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

@ghost ghost added awaiting reviews This PR is ready to be reviewed enhancement This PR modified some existing files labels Dec 16, 2020
@cclauss
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cclauss commented Dec 16, 2020

I do not quite understand the title of this PR. In what way is the current implementation broken?

@realDuYuanChao
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realDuYuanChao commented Dec 16, 2020 •
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I do not quite understand the title of this PR. In what way is the current implementation broken?

We should insert value instead of swapping elements of array.

@realDuYuanChao realDuYuanChao changed the title Fixed shell sort Optimization for shell sort Dec 16, 2020
@l3str4nge
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Is your implementation improve performance or what? If so please write proper tests for proof that your solution is better than already exists.

l3str4nge
l3str4nge requested changes Dec 16, 2020
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Need additional tests for performance

@ghost ghost added awaiting changes A maintainer has requested changes to this PR and removed awaiting reviews This PR is ready to be reviewed labels Dec 16, 2020
@poyea
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poyea commented Dec 16, 2020

Maybe we can strictly follow this?: https://en.wikipedia.org/wiki/Shellsort#Pseudocode
Sometimes it's just a matter of styles.

poyea
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We may add a reference to the wiki page as well.

@ghost ghost added awaiting reviews This PR is ready to be reviewed and removed awaiting changes A maintainer has requested changes to this PR labels Dec 17, 2020
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@poyea Done. Please review again.

poyea
poyea reviewed Dec 17, 2020
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sorts/shell_sort.py
Comment on lines 1 to +2
"""
This is a pure Python implementation of the shell sort algorithm

For doctests run following command:
python -m doctest -v shell_sort.py
or
python3 -m doctest -v shell_sort.py

For manual testing run:
python shell_sort.py
https://en.wikipedia.org/wiki/Shellsort#Pseudocode
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I would leave the first line like this

Suggested change
"""
This is a pure Python implementation of the shell sort algorithm
For doctests run following command:
python -m doctest -v shell_sort.py
or
python3 -m doctest -v shell_sort.py
For manual testing run:
python shell_sort.py
https://en.wikipedia.org/wiki/Shellsort#Pseudocode
"""
This is a Python implementation of the shell sort algorithm.
Reference: https://en.wikipedia.org/wiki/Shellsort#Pseudocode

poyea
poyea approved these changes Dec 17, 2020
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I would approve this as the original version has really no reference to the algorithm (or at least, the implementation didn't strictly follow the algorithm). Thank you for your pull request!🤩

@ghost ghost removed the awaiting reviews This PR is ready to be reviewed label Dec 17, 2020
poyea
poyea reviewed Dec 17, 2020
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@ghost ghost added the awaiting reviews This PR is ready to be reviewed label Dec 18, 2020
@realDuYuanChao
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@poyea Done

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@mateuszz0000 Can you review again. Thanks :)

@l3str4nge l3str4nge merged commit 53371b2 into TheAlgorithms:master Dec 18, 2020
@ghost ghost removed the awaiting reviews This PR is ready to be reviewed label Dec 18, 2020
@realDuYuanChao realDuYuanChao deleted the ShellSort branch December 19, 2020 00:27
stokhos pushed a commit to stokhos/Python that referenced this pull request Jan 3, 2021
@realDuYuanChao @poyea @stokhos
Optimization for shell sort (TheAlgorithms#4038)
6729c41 
* fixed shell sort

* udpate code style

* Update sorts/shell_sort.py

Co-authored-by: John Law <[email protected]>

Co-authored-by: John Law <[email protected]>
peRFectBeliever pushed a commit to peRFectBeliever/Python that referenced this pull request Apr 1, 2021
@realDuYuanChao @poyea @peRFectBeliever
Optimization for shell sort (TheAlgorithms#4038)
97ef2fe 
* fixed shell sort

* udpate code style

* Update sorts/shell_sort.py

Co-authored-by: John Law <[email protected]>

Co-authored-by: John Law <[email protected]>
Panquesito7 pushed a commit to Panquesito7/Python that referenced this pull request May 13, 2021
@realDuYuanChao @poyea
Optimization for shell sort (TheAlgorithms#4038)
4debab3 
* fixed shell sort

* udpate code style

* Update sorts/shell_sort.py

Co-authored-by: John Law <[email protected]>

Co-authored-by: John Law <[email protected]>
shermanhui pushed a commit to shermanhui/Python that referenced this pull request Oct 22, 2021
@realDuYuanChao @poyea @shermanhui
Optimization for shell sort (TheAlgorithms#4038)
46b0e6a 
* fixed shell sort

* udpate code style

* Update sorts/shell_sort.py

Co-authored-by: John Law <[email protected]>

Co-authored-by: John Law <[email protected]>
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@poyea poyea poyea approved these changes

@l3str4nge l3str4nge l3str4nge approved these changes

@cclauss cclauss Awaiting requested review from cclauss

@dhruvmanila dhruvmanila Awaiting requested review from dhruvmanila

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