Run mix deps.get to fetch dependencies.
Run mix compile to compile the application.
Run mix test to run tests.
Run mix test --only day_<DAY> to run tests for a specific day's solution.
Run mix solve <DAY> to generate input and solution module files.
Run iex -S mix to start an IEx session.
Run Solution.solve(day, part), where day is the day of the puzzle (1 -
25) and part is the part of the puzzle (1 or 2).