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Tighten up quicksort() (#3319)

* Tighten up quicksort()

* updating DIRECTORY.md

* str does not support .pop()

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
C
Christian Clauss committed
2e90debab31f8fef88fafee5a7e2b2d1ab738d30
Parent: f0033f8
Committed by GitHub <noreply@github.com> on 10/15/2020, 1:07:34 PM