public function __invoke()
{
$input = file_get_contents(__DIR__ . "/../../input/Day9/Puzzle1");
$mapper = new DistanceMapper();
$cities = $mapper->createCities($input);
$permutations = new Permutations();
$planner = new JourneyPlanner($permutations, $cities);
$shortestJourney = $planner->calculateShortestRoute();
echo "Shortest route: " . $shortestJourney->distance();
}
