public void Part1()
{
string[] input = File.ReadAllLines("Day09Input.txt");
Point2 bounds = new Point2(input[0].Length, input.Length);
Grid2 <int> grid = new Grid2 <int>(bounds);
foreach (Point2 point in Point2.Quadrant(bounds))
{
grid[point] = input[point.Y][point.X] - '0';
}
long result = Point2.Quadrant(bounds)
.Where(point => grid.Adjacent(point).All(value => value > grid[point]))
.Sum(point => grid[point] + 1);
Assert.Equal(462, result);
}
public void Part2()
{
string[] input = File.ReadAllLines("Day09Input.txt");
Point2 bounds = new Point2(input[0].Length, input.Length);
Grid2 <int> grid = new Grid2 <int>(bounds);
foreach (Point2 point in Point2.Quadrant(bounds))
{
grid[point] = input[point.Y][point.X] - '0';
}
long result = Point2.Quadrant(bounds)
.Where(point => grid.Adjacent(point).All(value => value > grid[point]))
.Select(point => SizeOfBasin(point, grid, new bool[bounds.X, bounds.Y]))
.OrderByDescending(i => i)
.Take(3)
.Aggregate((x, y) => x * y);
Assert.Equal(1397760, result);
}
