mypy: Exclude only 20 files that are still failing

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip setuptools six wheel
           python -m pip install mypy pytest-cov -r requirements.txt
-      - run: mypy --install-types --non-interactive .
+      - run: mypy .  # See `mypy.ini` for configuration settings.
       - name: Run tests
         run: pytest --doctest-modules --ignore=project_euler/ --ignore=scripts/validate_solutions.py --cov-report=term-missing:skip-covered --cov=. .
       - if: ${{ success() }}

mypy.ini

@@ -1,5 +1,5 @@
 [mypy]
 ignore_missing_imports = True
-
-; FIXME: #4052 fix mypy errors in the exclude directories and remove them below
-exclude = (data_structures|graphs|maths|matrix|other|searches)/$
+install_types = True
+non_interactive = True
+exclude = /(data_structures/stacks/next_greater_element\.py|graphs/boruvka\.py|graphs/breadth_first_search\.py|graphs/breadth_first_search_2\.py|graphs/check_cycle\.py|graphs/finding_bridges\.py|graphs/greedy_min_vertex_cover\.py|graphs/random_graph_generator\.py|maths/average_mode\.py|maths/gamma_recursive\.py|maths/proth_number\.py|maths/series/geometric_series\.py|maths/series/p_series\.py|matrix/matrix_operation\.py|other/fischer_yates_shuffle\.py|other/least_recently_used\.py|other/lfu_cache\.py|other/lru_cache\.py|searches/simulated_annealing\.py|searches/ternary_search\.py)$