Yet again I got stuck in the common AOC trap: The example input worked,
but not the actual input.
2 things got me stuck.
> The size of a basin is the number of locations within the basin, including the low point. The example above has four basins.
1. I missed the obvious part to only check the low points.
2. Based on the example, I asumed that the adjacent locations would
increase by one to count. This is wrong: What matters is that their
height is a larger value.
Way too long time for a simple problem. Never read puzzles sloppy.
