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I had the same thought. This is super interesting but just needs one more paragraph up top explaining the rules and what the goals of the problem are.

I think this could be reframed into an interesting homework assignment given the right description of the rules. I really want to emphasize that this is a very cool article though. Big fan.

A basic sprinkler in Stardew Valley waters the four orthogonally adjacent plots. Space and walking time are somewhat limited, so you want to optimize for that.

Looking at those outputs is a little confusing since not all dots will actually be watered. The partitioning also adds to that.

I was assuming the OP was talking about iridium (or at least quality) sprinklers, the graphs don't look like good placements for basic sprinklers at all. I guess basic sprinklers do pose a somewhat more interesting problem - then again you use them only for a very short time before moving on...

Now if it included scarecrow placement and shortest distance for non-traversable crops like beans, that would be something else...

Also missing optimal placement of scarecrows for larger farms.