Add solution for Project Euler problem 59 (#4031)

* Added solution for Project Euler problem 59

* updating DIRECTORY.md

* Formatting, type hints, no more evil map functions

* Doctests

* Added doctests for Project Euler problem 59

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

fpringle committed 5y ago

ae8a5f86754ea1cc466314fa40a664c7322d4be9

Parent: a6f6eb2

Committed by GitHub <noreply@github.com> on 12/13/2020, 11:09:52 AM