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