2021 advent of code - day 15 solutions

a bit of a shorter explanation today since this is one of those "you know the algorithm or you don't days" -- I also show off `heapq` for making a priority queue

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[marsma]

This feeling when 75% of my code is similar to yours and this weirdo MOD on that puzzle. One differtence is that i do not use heap and so i have to check every point on the tab. Just a littlebit longer to execute, but have same result.