* Updated test cases of power_sum.py
* updated
* updated.
* remove extra comment and used ** instead of pow
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* Update backtracking/power_sum.py
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Tianyi Zheng <tianyizheng02@gmail.com>
* Add powersum problem
* Add doctest
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* Add more doctests
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* Add more doctests
* Improve paramater name
* Fix line too long
* Remove global variables
* Apply suggestions from code review
* Apply suggestions from code review
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Co-authored-by: Christian Clauss <cclauss@me.com>