Balanced parentheses (#3768)
* Fixed balanced_parentheses.py * fixed pre-commit * eliminate is_paired * remove unused line * updating DIRECTORY.md * Update data_structures/stacks/balanced_parentheses.py Co-authored-by: NChristian Clauss <cclauss@me.com> * Add more test cases * Update data_structures/stacks/balanced_parentheses.py Co-authored-by: NChristian Clauss <cclauss@me.com> Co-authored-by: Ngithub-actions <${GITHUB_ACTOR}@users.noreply.github.com> Co-authored-by: NChristian Clauss <cclauss@me.com>
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