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day 15 thread of aoc i guess lol: diamonds are forever

see leaderboard on geeses post

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Really enjoyed this one. I felt like a :marseybigbrain: when I realized you can just trace along the perimeters of the diamonds to massively cut down on the number of spaces to check for part 2, since the one remaining space logically has to be touching the border of several of them.

![](/images/16711423016737957.webp)

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