* Add powersum problem
* Add doctest
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* Add more doctests
* Improve paramater name
* Fix line too long
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* pre-commit: Upgrade psf/black for stable style 2023
Updating https://github.com/psf/black ... updating 22.12.0 -> 23.1.0 for their `2023 stable style`.
* https://github.com/psf/black/blob/main/CHANGES.md#2310
> This is the first [psf/black] release of 2023, and following our stability policy, it comes with a number of improvements to our stable style…
Also, add https://github.com/tox-dev/pyproject-fmt and https://github.com/abravalheri/validate-pyproject to pre-commit.
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* add backtracking word search
* updating DIRECTORY.md
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* review notes fixes
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* small cleanup
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* small cleanup 2
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* Update backtracking/word_search.py
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* Update backtracking/word_search.py
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* Update backtracking/word_search.py
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* Create minmax.py
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* Added 5 README files
* corrected arithmetic_analysis README
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* Remove redundent function
After reviewing this code, I've noticed that the `is_completed` function is a redundant operation.
Increasing the number of loops required for each step of the sudoku solver.
This should remove n² operations where n is the width of the grid.
* Update sudoku.py
Remove additional newline
* Added static typing to backtracking algorithms
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* added type hints and doctests for minimax algorithm
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* last fix
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* Fix spelling in docstrings
* Improve comments and formatting
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* Update rat_in_maze.py
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* add new file for another solution to the n queens problem
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* No newline at the end of the file
* Type hints
* whitespaces fixed
* Fixed whitespaces
* Add type hints
* CodeSpell fixed
* update
* All changes made except changing the board variable to local
* Add doctest
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* Euler problem 551 sol 1: Reduce McCabe code complexity
As discussed in #2128
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* Fix line break after binary operator
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* Tighten up psf/black and flake8
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* Fix some E741
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* spelling corrections
* review
* improved documentation, removed redundant variables, added testing
* added type hint
* camel case to snake case
* spelling fix
* review
* python --> Python # it is a brand name, not a snake
* explicit cast to int
* spaces in int list
* "!= None" to "is not None"
* Update comb_sort.py
* various spelling corrections in documentation & several variables naming conventions fix
* + char in file name
* import dependency - bug fix
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* Simplify sudoku.is_completed() using builtin all()
Simplify __sudoku.is_completed()__ using Python builtin function [__all()__](https://docs.python.org/3/library/functions.html#all).
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* Old style exception -> new style for Python 3
* updating DIRECTORY.md
* Update convex_hull.py
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* e.args[0] = "msg"
* ValueError: could not convert string to float: 'pi'
* Update convex_hull.py
* fixup! Format Python code with psf/black push
