* Pyupgrade to Python 3.9 * updating DIRECTORY.md Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
* Add naive recursive implementation of 0-1 Knapsack problem * Fix shadowing * Add doctest * Fix type hints * Add link to wiki * Blacked the file * Fix isort * Move knapsack / add readme and more tests * Add missed main in tests