Fixing stock_span_problem.py (#10540)

* Adding doctests in simpson_rule.py

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* Update stock_span_problem.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update subset_generation.py

* Update subset_generation.py

* Update data_structures/stacks/stock_span_problem.py

Co-authored-by: Christian Clauss <[email protected]>

* Update stock_span_problem.py

* Update data_structures/stacks/stock_span_problem.py

Co-authored-by: Christian Clauss <[email protected]>

* Update stock_span_problem.py

* Update stock_span_problem.py

* updating DIRECTORY.md

* Update stock_span_problem.py

* Update stock_span_problem.py

* Update stock_span_problem.py

* Update stock_span_problem.py

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>
Co-authored-by: Maxim Smolskiy <[email protected]>
Co-authored-by: MaximSmolskiy <[email protected]>