Added sudoku type hints [Hacktober Fest] (#3124)

* chore(sudoku): added type hints [HACKTOBER-FEST]

* updating DIRECTORY.md

* chore: added matrix type alias

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

Tapajyoti Bose committed 5y ago

3324bbb94b5b09d87fa3b90ad2e48e14e8a9b864

Parent: 02d3ab8

Committed by GitHub <noreply@github.com> on 10/10/2020, 7:02:51 AM